Craftsman Series 606 Operator`s manual

For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
TECUMSEH
T E C H N I C I A N ' S
This handbook covers VLV40 - 675.
Other illustrated Tecumseh 2 and 4-Cycle Engine and
Transmission handbooks, booklets and wall charts are
available from Tecumseh.
VLV
(Vector)
4-CYCLE
ENGINES
For complete listing write, call or check our website at
www.TecumsehPower.com
ENGINES & TRANSMISSIONS
Tecumseh Products Company
Engine & Transmission Group
900 North Street
Grafton, WI 53024
Phone: 262-377-2700
FAX: 262-377-4485
Tecumseh Europa S.p.A.
Strada delle Cacce, 99
10135 Torino, Italy
Tel. 011 39 11 391-8411
Telefax 011 39 11 3910031
ENGINES & TRANSMISSIONS
www.TecumsehPower.com
Form No. 695578 Rev. 6/02
Litho in U.S.A.
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H A N D B O O K
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IMPORTANT NOTICE!
SAFETY DEFINITIONS
Statements in this manual preceded by the following
words are of special significance:
WARNING
or
WARNING indicates a potentially hazardous situation
which if not avoided, could result in death or serious
injury.
NOTE
Refers to important information and is placed in italic type.
It is recommended that you take special notice of all
items discussed on the next page and wear the
appropriate safety equipment.
Before operating this engine it is your responsibility to
read this Operator’s Manual. Follow these basic rules
for your personal safety:
• Keep this manual handy at all times for future
reference.
• Read it carefully and familiarize yourself with
operating, maintenance, components and
safety instructions
Notice Regarding Emissions
NOTE
Engines which are certified to comply with California and
U.S. EPA emission regulations for SORE (Small Off Road
Equipment), are certified to operate on regular unleaded
gasoline, and include the following emission control
systems: (EM) Engine Modification and (TWC) Threeway Catalyst (if so equipped).
Tecumseh Website
Visit the Tecumseh website at:
www.TecumsehPower.com
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Table Of Contents
Page
Chapter 1 General Information .......................................................................................... 1-1
Engine Identification ....................................................................................................... 1-1
Prior to 1999 ................................................................................................................... 1-1
Short Blocks ................................................................................................................... 1-1
Parts Identification .......................................................................................................... 1-2
Parts List......................................................................................................................... 1-3
Oil and Fuel Specifications ............................................................................................. 1-4
Oil ............................................................................................................................... 1-4
Fuel............................................................................................................................. 1-4
Filling Fuel Tank ......................................................................................................... 1-4
Stopping the Engine and Short Term Storage................................................................ 1-4
Maintenance and Adjustments ....................................................................................... 1-5
Checking and Changing Oil ........................................................................................ 1-5
Removing Debris from Engine .................................................................................... 1-5
Spark Plug .................................................................................................................. 1-6
Cleaning/replacing Air Cleaner ................................................................................... 1-6
Servicing Paper Filters ............................................................................................... 1-6
Carburetor .................................................................................................................. 1-6
Engine Speed ............................................................................................................. 1-6
Engine Stopping Mechanism ...................................................................................... 1-6
Seasonal Storage ........................................................................................................... 1-7
Fuel System ................................................................................................................ 1-7
Method 1..................................................................................................................... 1-7
Method 2..................................................................................................................... 1-7
Oil ............................................................................................................................... 1-7
Lubricating Cylinder Bore ........................................................................................... 1-7
Quick Maintenance Chart ........................................................................................... 1-7
4-Cycle Engine Theory ................................................................................................... 1-8
Intake .......................................................................................................................... 1-8
Compression ............................................................................................................... 1-8
Power .......................................................................................................................... 1-8
Exhaust ....................................................................................................................... 1-8
Chapter 2 Air Cleaners....................................................................................................... 2-1
General Information ........................................................................................................ 2-1
Air Cleaner Service ......................................................................................................... 2-1
Polyurethane Pre-Filters ............................................................................................. 2-1
To Service Air Cleaner ............................................................................................... 2-2
Carburetion ..................................................................................................................... 2-3
General ....................................................................................................................... 2-3
Identification ............................................................................................................... 2-3
Float Bowl Service .......................................................................................................... 2-3
Rebuilding Carburetor Body ....................................................................................... 2-3
Removing Welch Plug ................................................................................................ 2-3
Chapter 3 Governors and Linkage .................................................................................... 3-1
General Information ........................................................................................................ 3-1
Linkage Assembly/Disassembly ..................................................................................... 3-2
Governor Adjustment ...................................................................................................... 3-2
Speed Controls ............................................................................................................... 3-2
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Table Of Contents (Continued)
Page
Chapter 4 Starters .............................................................................................................. 4-1
Disassembly and Inspection ........................................................................................... 4-1
Assembly and Inspection................................................................................................ 4-1
Stylized Rewind Starter with Plastic Retainer ................................................................. 4-2
Disassembly and Inspection ....................................................................................... 4-2
Assembly and Inspection............................................................................................ 4-2
12 Volt Electric Starters .................................................................................................. 4-3
Removal ..................................................................................................................... 4-3
Parts List..................................................................................................................... 4-3
Drive Assembly Service .............................................................................................. 4-3
Check Brushes ........................................................................................................... 4-4
Armature Check.......................................................................................................... 4-4
Assembly .................................................................................................................... 4-5
Chapter 5 Flywheels........................................................................................................... 5-1
General Information ........................................................................................................ 5-1
High Inertia Flywheel ...................................................................................................... 5-1
Diecast Aluminum Flywheel ........................................................................................... 5-1
Removal ......................................................................................................................... 5-1
Cored Holes.................................................................................................................... 5-2
Installation ...................................................................................................................... 5-2
Brake System ................................................................................................................. 5-3
Method 1..................................................................................................................... 5-3
Method 2..................................................................................................................... 5-3
Stopping the Engine ...................................................................................................... 5-3
To Start Engine ............................................................................................................. 5-3
Wiring Diagrams ............................................................................................................. 5-4
Battery ............................................................................................................................ 5-4
Brake Pad Replacement................................................................................................. 5-4
Brake Control Lever Replacement ................................................................................. 5-5
Control Switch ................................................................................................................ 5-5
Checking Control Switch ................................................................................................ 5-5
Chapter 6 Alternator........................................................................................................... 6-1
Alternator ........................................................................................................................ 6-1
Troubleshooting Electric Start Engines .......................................................................... 6-1
Troubleshooting for Both Mechanical and Electric Start Systems .................................. 6-1
Chapter 7 Ignition ............................................................................................................... 7-1
Solid State Ignition.......................................................................................................... 7-1
Solid State Ignition Operation ......................................................................................... 7-1
Spark Plug Service ......................................................................................................... 7-1
Ignition Timing ................................................................................................................ 7-1
Chapter 8 Piston, Rings and Connecting Rod ................................................................. 8-1
Piston and Rings ............................................................................................................ 8-1
Connecting Rods ............................................................................................................ 8-2
Chapter 9 Cylinders and Cylinder Heads ......................................................................... 9-1
Cylinder Service ............................................................................................................. 9-1
Reboring ..................................................................................................................... 9-1
Cylinder Heads ............................................................................................................... 9-1
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Table Of Contents (Continued)
Page
Chapter 10 Crankshafts, Camshafts and Lubrication ................................................... 10-1
Crankshafts .................................................................................................................. 10-1
Crankshaft Timing Mark ........................................................................................... 10-1
Camshaft Removal ....................................................................................................... 10-1
Lubrication System ....................................................................................................... 10-2
Oil Pump ....................................................................................................................... 10-2
Chapter 11 Valves, Lifters, Spring and Valve Seats ...................................................... 11-1
General Information ...................................................................................................... 11-1
Valve Removal ............................................................................................................. 11-1
Valve Seats .................................................................................................................. 11-1
Valve Adjustments ........................................................................................................ 11-2
Valve Installation .......................................................................................................... 11-2
Valve Lifters .................................................................................................................. 11-2
Oversize Valve Guides ................................................................................................. 11-2
Chapter 12 Oil Seal Service and Mounting Flange ........................................................ 12-1
Oil Seal Service ............................................................................................................ 12-1
Seal Replacement ........................................................................................................ 12-1
Chapter 13 Troubleshooting ........................................................................................... 13-1
Table 1. 4-Cycle Engine Troubleshooting Chart ........................................................... 13-2
Table 2. Carburetor Malfunction Check Points ............................................................. 13-5
Table 3. Troubleshooting 12 Volt Starters .................................................................... 13-6
Chapter 14 Engine Specifications .................................................................................. 14-1
Torque Specifications .................................................................................................. 14-2
Chapter 15 Education Materials and Tools .................................................................... 15-1
Tool Kit ......................................................................................................................... 15-2
Chapter 16 Sears Craftsman Reference Chart .............................................................. 16-1
Decimal/Fraction Conversions ...................................................................................... 16-2
© Tecumseh Products Company 2002
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Page iii
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I. General Safety Precautions
WARNING
Read equipment manufacturer’s manual
and this material thoroughly before using
this engine. Failure to do so can result in
serious injury or death. Call Tecumseh
Products Company at 1-800-558-5402 if
you have any questions.
A. Avoid Carbon Monoxide Poisoning
All engine exhaust
contains carbon
monoxide, a deadly
gas. Breathing
carbon monoxide
can cause headaches, dizziness,
drowsiness,
nausea, confusion
and eventually death.
• NEVER remove fuel cap or add fuel when
engine is running.
• Allow engine to cool before refueling.
• NEVER fill fuel tank indoors. Fill fuel tank
outdoors in a well-ventilated area.
• DO NOT smoke while refueling tank.
• Use only an approved red GASOLINE
container to store and dispense fuel.
• DO NOT attempt to pour fuel from engine.
Empty fuel tank by running engine.
C. Transporting Engine
DO NOT transport engine with fuel in tank. Fuel vapor
or spilled fuel may ignite.
D. Avoid Other Fires
Carbon monoxide is a colorless, odorless, tasteless
gas which may be present even if you do not see or
smell any engine exhaust. Deadly levels of carbon
monoxide can collect rapidly and you can quickly be
overcome and unable to save yourself. Also, deadly
levels of carbon monoxide can linger for hours or
days in enclosed or poorly-ventilated areas. If you
experience any symptoms of carbon monoxide
poisoning, leave the area immediately, get fresh air,
and SEEK MEDICAL TREATMENT.
To prevent serious injury or death from carbon
monoxide:
• NEVER run engine indoors. Even if you try
to ventilate engine exhaust with fans or
open windows and doors, carbon monoxide
can rapidly reach dangerous levels.
• NEVER run engine in poorly-ventilated or
partially enclosed areas such as barns,
garages, basements, carports, under
dwellings, or in pits.
• NEVER run engine outdoors where engine
exhaust can be drawn into a building through
openings such as windows and doors.
B. Avoid Gasoline Fires
Gasoline (fuel) vapors are highly
flammable and can explode. Fuel
vapors can spread and be ignited by
a spark or flame many feet away from
engine. To prevent injury or death
from fuel fires, follow these instructions:
Page iv
• NEVER store engine with fuel in fuel tank
inside a building with potential sources of
ignition such as hot water and space heaters,
clothes dryers, electric motors, etc.
To reduce the risk of fire, keep all materials that can
burn, including grass and leaves, away from muffler
and the rest of the engine.
E. Stay Away from Hot Surfaces
The muffler and other engine parts
become extremely hot during
operation and remain hot after the
engine has stopped. To avoid
severe burns on contact, stay away
from these areas.
F. Do Not Modify Engine
To avoid serious injury or death, DO NOT modify
engine in any way. NEVER tamper with the factory
setting of engine governor. Running the engine faster
than the speed set at the factory can be dangerous and
will VOID THE ENGINE WARRANTY.
G. Avoid Accidental Starts
To prevent accidental starting when working on equipment, always disconnect spark plug wire and keep it
away from spark plug.
H. Stay Away from Rotating Parts
Never operate engine with covers
or guards removed. Rotating parts
can cause severe injury. Keep
hands, feet, hair, jewelry and
clothing away from all moving parts.
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For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
I. General Safety Precautions
WARNING
Read equipment manufacturer’s manual
and this material thoroughly before using
this engine. Failure to do so can result in
serious injury or death. Call Tecumseh
Products Company at 1-800-558-5402 if
you have any questions.
A. Avoid Carbon Monoxide Poisoning
All engine exhaust
contains carbon
monoxide, a deadly
gas. Breathing
carbon monoxide
can cause headaches, dizziness,
drowsiness,
nausea, confusion
and eventually death.
• NEVER remove fuel cap or add fuel when
engine is running.
• Allow engine to cool before refueling.
• NEVER fill fuel tank indoors. Fill fuel tank
outdoors in a well-ventilated area.
• DO NOT smoke while refueling tank.
• Use only an approved red GASOLINE
container to store and dispense fuel.
• DO NOT attempt to pour fuel from engine.
Empty fuel tank by running engine.
C. Transporting Engine
DO NOT transport engine with fuel in tank. Fuel vapor
or spilled fuel may ignite.
D. Avoid Other Fires
Carbon monoxide is a colorless, odorless, tasteless
gas which may be present even if you do not see or
smell any engine exhaust. Deadly levels of carbon
monoxide can collect rapidly and you can quickly be
overcome and unable to save yourself. Also, deadly
levels of carbon monoxide can linger for hours or
days in enclosed or poorly-ventilated areas. If you
experience any symptoms of carbon monoxide
poisoning, leave the area immediately, get fresh air,
and SEEK MEDICAL TREATMENT.
To prevent serious injury or death from carbon
monoxide:
• NEVER run engine indoors. Even if you try
to ventilate engine exhaust with fans or
open windows and doors, carbon monoxide
can rapidly reach dangerous levels.
• NEVER run engine in poorly-ventilated or
partially enclosed areas such as barns,
garages, basements, carports, under
dwellings, or in pits.
• NEVER run engine outdoors where engine
exhaust can be drawn into a building through
openings such as windows and doors.
B. Avoid Gasoline Fires
Gasoline (fuel) vapors are highly
flammable and can explode. Fuel
vapors can spread and be ignited by
a spark or flame many feet away from
engine. To prevent injury or death
from fuel fires, follow these instructions:
Page iv
• NEVER store engine with fuel in fuel tank
inside a building with potential sources of
ignition such as hot water and space heaters,
clothes dryers, electric motors, etc.
To reduce the risk of fire, keep all materials that can
burn, including grass and leaves, away from muffler
and the rest of the engine.
E. Stay Away from Hot Surfaces
The muffler and other engine parts
become extremely hot during
operation and remain hot after the
engine has stopped. To avoid
severe burns on contact, stay away
from these areas.
F. Do Not Modify Engine
To avoid serious injury or death, DO NOT modify
engine in any way. NEVER tamper with the factory
setting of engine governor. Running the engine faster
than the speed set at the factory can be dangerous and
will VOID THE ENGINE WARRANTY.
G. Avoid Accidental Starts
To prevent accidental starting when working on equipment, always disconnect spark plug wire and keep it
away from spark plug.
H. Stay Away from Rotating Parts
Never operate engine with covers
or guards removed. Rotating parts
can cause severe injury. Keep
hands, feet, hair, jewelry and
clothing away from all moving parts.
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Chapter 1
General Information
Engine Identification
Tecumseh engine model, specification and serial
numbers are stamped or on a decal on the blower
housing. The decal also contains any emission compliance information.
02012A
VLV60-5
The letters which precede the model numbers indicate
the basic type of engine:
VLV - Vector Lightweight Vertical
Prior to 1999
The numbers which followed the engine type letters
indicated the basic engine horsepower:
40 - 4.0 Horsepower
50 - 5.0 Horsepower
The current designation indicates cubic inch displacement
126 - 12.6 cubic inches
Following the engine model numbers are the engine
specifications numbers.
VLV60-502012A
(D)
6215C
The specification number is used when identifying
engine parts. Example 502012A.
The serial or D.O.M. Number is the production date
code.
2039 - serial number (example)
2 - Year in decade of manufacture (2002)
39 The last 3 digits of date code represent
the calendar (the 39th day of 2002)
D - represents the shift and line on which the
engine was built at the factory.
THIS ENGINE MEETS 1995-1998
CALIF. EMISSION REGULATIONS FOR
ULGE ENGINES AS APPLICABLE
FUEL: REGULAR UNLEADED OIL: USE SAE 30
Emitted engines that meet the California Air Resource
Board (C.A.R.B.) or the Environmental Protection
Agency (E.P.A.) Standards will include additional
required engine information on the engine decal.
VLV60-502012A (D)
RTP358UIG2RA
6215C
207cc
NOTE
To maintain best possible emission performance, use only
Genuine Tecumseh Parts.
Short Blocks
New short blocks are identified by a tag marked SBH
(Short Block Horizontal) or SBV (Short Block Vertical).
These tags are used to properly identify the correct
parts if service is required. They are attached to either
the sump bolts or valve box cover.
695578
1-1
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Model and Serial
Numbers Located
Here
NOTE
On newer VLV models the breather
tube will be a straight hose.
Optional
Pre-Filter
Parts Identification
This is a parts breakdown of a typical VLV engine. Use
this parts breakdown to identify parts. When ordering
parts always refer to the engine model and specification
number stamped on the engine blower housing.
Carburetor and starter breakdowns are found in the
chapters referring to their repair.
SBV-XXX
SER-XXX
106
NOTE
If the short block has been replaced, an identification
tag for service parts is located on the valve box cover.
1-2
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Ref.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
Part Name
Cylinder Ass'y.
Pin, Dowel
Element, Breather
Cover, Breather
Gasket, Breather cover
Screw, Thread forming, 10-24 x 1/2
Body, Breather valve
Valve, Breather check
Breather, Tube
Washer, Flat
Rod, Governor
Lever, Governor
Clamp, Governor lever
Screw, 8-32 x 5/16
Spring, Governor extension
Seal, Oil
Baffle, Blower housing (Incl. No. 195)
Screw, 1/4-20 x 5/8
Crankshaft Ass'y.
Piston & Pin Ass'y.
Ring Set, Piston
Ring, Piston pin retaining
Rod Ass'y., Connecting
Bolt, Connecting rod
Lifter, Valve
Camshaft Ass'y.
Pump Ass'y., Oil
Gasket, Mounting flange
Flange, Mounting
Plug, Oil drain
Seal, Oil
Washer, Flat
Gear Ass'y., Governor
Spool, Governor
Ring, Retaining
Gear, Idler
Screw, 1/4-20 x 1-9/16
Key, Flywheel
Flywheel
Fan, Flywheel
Washer, Belleville
Nut, Flywheel
Solid State Ass'y.
Cover, Spark plug
Screw, 10-24 x 1
Wire Ass'y., Ground
Gasket, Cylinder head
Head, Cylinder
Valve, Exhaust
Valve, Intake
Screw, 5/16-18 x 1-1/2
Spark Plug (Champion RJ-17LM or equivalent)
Spring, Valve
Ref.
No.
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
Part Name
Cap, Valve spring
Gasket, Valve cover
Cover, Valve spring box
Screw, 10-24 x 1/2
Stud, Carburetor mounting
Link, Governor
Spacer, Carburetor mounting gasket
Lever Ass'y., Brake
Lever, Brake control
Link, Brake control lever
Spring, Brake
Ring, Retaining
Terminal
Spring, Brake control lever
Bushing, Brake control leer & brake lever
Spring, Compression
Spring, Compression
Screw, 5-40 x 7/16
Screw, 6-32 x 21/32
Gasket, Carburetor to air cleaner
Body, Air cleaner (Incl. Nos. 239, 299 & 350)
Screw, 10-32 x 2-3/32
Filter, Air cleaner (Paper)
Cover, Air cleaner
Nut, Lock, 1/4-20
Screw, 1/4-20 x 11/16
Plate, Control Ass'y., cover
Screw, 8-32 x 1/2
Housing, Blower
Screw, 1/4-20 x 1/2
Ring, Starter
Muffler
Plate, Muffler locking
Screw, 5/16-18 x 2-11/32
Cup, Starter
Screw, 8-32 x 21/64
Line, Fuel
Clamp, Fuel line
Clip, "U" Type Nut, 10-32
Tank Ass'y., Fuel
Cap, Fuel
Tube, Oil fill
"O" Ring
Clip, Fill tube
Dipstick, Oil
Plug, Starter
Screw, 10-32 x 35/64
Primer
Decal, Instruction
Decal, Primer
Carburetor
Starter, Rewind
Carb Fix Kit
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Oil and Fuel Specifications
Oil
To operate engine you need to use a clean, high quality,
detergent oil. For recommended engine oil, See Table 1.
NOTES
Be sure original container is marked A.P.I. Service
“SL/SJ”.
Using multigrade oil above 32 F (0 C) will increase oil consumption. SAE10W40 is not recommended.
0
0
Table 1. Recommended Engine Oil
Oil Type
Temperature
Recommended Oil
Tecumseh Part No.
730225A
OR
SAE30W
Straight
Grade
Above 320F (00C)
Multi
Grade
00F to 320F (-180C to 00C) Tecumseh Part No.
730226A
OR
SAE5W30
SAE10W
The oil sump capacity is 21 ounces or 1-1/4 U.S. Pints
(.62 liters). Tecumseh special-formulated oils are available at your Authorized Tecumseh Servicing Dealer.
Below 00F (-180C)
SAE 0W30
Fuel
Use unleaded regular, unleaded premium or reformulated automotive fuel only. You may use gasoline
containing the following components identified in
Table 2.
• DO NOT use leaded fuel.
• Fuel must be fresh and clean. NEVER use fuel
left over from last season or stored for long
periods.
• NEVER mix oil with fuel.
• DO NOT use fuel containing Methanol (Wood
Alcohol).
Filling Fuel Tank
WARNING Gasoline (fuel) vapors are highly
flammable and can explode. Fuel
vapors can spread and be ignited by a spark or
flame many feet away from engine. To prevent
injury or death from fuel fires, follow these
instructions:
1.
Stop engine and allow it to cool before refueling.
2.
Be sure engine is outdoors and in a well-ventilated
area.
3.
Clean area around fuel fill cap and remove fuel fill
cap. See Figure 2.
4.
Using an approved red GASOLINE container, add
fuel slowly, being careful to avoid spilling. DO NOT
overfill fuel tank. Leave space in the tank to allow
fuel to expand without overflowing.
5.
Replace fuel fill cap securely and wipe up spilled
fuel before starting engine. If fuel is spilled DO NOT
start engine. Move machine away from area of
spillage. Avoid creating any source of ignition until
fuel vapors are gone.
Table 2. Recommended Fuel
Fuel Component
Percentage
Ethanol
10%
Grain Alcohol (“Gasohol”)
10%
MTBE (Methyl Tertiary Butyl Ether)
15%
ETBE (Ethyl Tertiary Butyl Ether)
15%
Stopping the Engine and
Short-Term Storage
Stop engine according to equipment manufacturer’s
instructions.
store the engine with fuel
WARNING Never
in the fuel tank inside a building
with potential sources of ignition
such as hot water and space heaters, clothes
dryers, electric motors, etc.
1-4
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Maintenance and Adjustments
Removing Debris from Engine
To prevent accidental starting
WARNING when working on equipment,
always disconnect spark plug wire
and keep it way from spark plug by attaching it
securely to grounding post.
Before each use, remove grass clippings, dirt and debris
from the following areas:
The muffler and other engine
WARNING parts become extremely hot
during operation and remain hot
after the engine has stopped. To avoid severe
burns on contact, stay away from these areas.
• Cooling fins
• Air intake screen
• Levers
• Linkage
Removing debris will insure adequate cooling, correct
engine speed and reduce the risk of fire.
Spark Plug Wire
Spark Plug
Grounding Post
Spark Plug / Grounding Post
Levers and Linkage
Checking and Changing Oil
Oil Drain Plug
To avoid engine damage, it is important to:
•
Check oil level after every 5 operating hours when
engine is warm and before each use.
•
Change oil after first 2 operating hours and every
25 operating hours thereafter; more often if
operated in extremely dusty or dirty conditions.
Engine should still be warm but not hot from recent
use.
Cooling Fins
Muffler
Bottom of Engine
1. Be sure you find the correct drain plug location if
present. (See equipment manufacturer’s instructions).
2. Disconnect spark plug wire and keep it away from
spark plug by attaching it securely to grounding post.
3. Make sure the gas cap is on and is tightened securely.
4. Clean area around oil drain plug.
5. Place approved recyclable oil container under oil drain
plug, tipping engine to position the oil drain plug at
the lowest point on the engine. (See equipment
manufacturer’s instructions).
6. Remove oil drain plug and drain oil.
7. Install oil drain plug and tighten securely.
8. Fill with recommended oil. See Table 2.
9. Wipe away any spilled oil.
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Spark Plug
Check spark plug yearly or every 100 operating hours.
1.
Clean area around spark plug.
2.
Remove and inspect spark plug.
3.
Replace spark plug if porcelain is cracked or if
electrodes are:
Flange
Slot
Ta b s
• Pitted
• Burned
• Fouled with deposits
4.
Check electrode gap with wire feeler gauge and set
gap to .030 (0.76mm) if necessary.
5.
Install spark plug and tighten securely.
Paper Filter
Cover
NOTE
Air Cleaner Assembly
A resistor spark plug must be used for replacement
(Tecumseh part no. 33636, or Champion part no. RJ-17LM).
Carburetor
Electrodes
Porcelain
If you think your carburetor needs adjusting, see your
nearest Authorized Tecumseh Servicing Dealer. Engine
performance should not be affected at altitudes up to
7,000 feet (2,134 meters). For operation at higher
elevations, contact your Authorized Tecumseh Servicing
Dealer.
Engine Speed
.030 (0.76mm) Gap
Resistor Spark Plug
Cleaning/Replacing Air Cleaner
Your engine has an air cleaner which helps prevent
premature engine wear and failure. NEVER run engine
without complete air cleaner installed on engine. Your
air cleaner periodically needs to be replaced.
Servicing Paper Filters
Paper filters cannot be cleaned and must be replaced
once a year or every 100 operating hours; more often if
used in extremely dusty conditions. Replacement
filters are available at a Authorized Tecumseh Servicing
Dealer. Follow the instructions next to the drawing of
your air cleaner to remove and replace it.
To avoid serious injury NEVER
WARNING tamper with the factory setting of
engine governor. Running the
engine faster than the speed set at the factory
can be dangerous and will viod the engine
warranty.
Engine Stopping Mechanism
WARNING Some engines are equipped with
a federally-mandated mechanism
which stops the engine and mower blade. To
avoid serious injury or death as a result of
contact with the mower blade, do not interfere
with or bypass this mechanism. Parts of the
mechanism may be subject to wear and must be
checked once a year by an Authorized Tecumseh
Servicing Dealer. In the event the mechanism
fails for any reason, you must not use the engine
until corrected by an Authorized Tecumseh
Servicing Dealer.
NOTE
DO NOT put oil on or clean paper filter.
1-6
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Seasonal Storage
Lubricating Cylinder Bore
If engine is to be unused for more than a month, prepare
engine as indicated below:
lubricating cylinder bore,
WARNING When
fuel may spray from the spark
plug hole. To prevent serious injury from fuel
fires, follow these instructions:
Fuel System
Fuel stored in the tank will gradually deteriorate, leaving
gum deposits which will clog the carburetor or fuel
system. To avoid these problems, treat the fuel system
in one of the two following methods:
1.
Disconnect spark plug wire and keep it away from
spark plug by attaching it securely to grounding
post.
2.
Remove spark plug.
Method 1
3.
Squirt 1oz. (30ml) of clean engine oil into spark
plug hole.
4.
Cover spark plug hole with rag to prevent fuel from
spraying from spark plug hole when starter rope is
pulled.
5.
Grasp starter cord handle and pull out slowly using
a full arm stroke. Repeat once. (This will distribute
oil throughout the cylinder to prevent corrosion
during storage.)
6.
Install spark plug.
NOTE
TRA
Tecumseh recommends using UL
ULTRA
TRA--FRESH™ gasoline stabilizer as an acceptable method of minimizing
formation of fuel gum deposits during storage; This product is available from your Authorized Tecumseh Servicing Dealer.
1.
Add fuel preservative/stabilizer according to
manufacturers instructions.
2.
Run engine at least 10 minutes after adding
stabilizer to allow it to reach carburetors.
NOTES
Always follow mix ratio found on stabilizer container.
Failure to do so may result in equipment damage.
NOTE
Connect spark plug wire before attempting to start engine once engine is out of storage.
Quick Maintenance Chart
DO NOT drain stabilizer from carburetor. Doing so may
result in gum deposits and/or corrosion and cause
equipment malfunction.
Instead of using a fuel preservative/stabilizer, you can
empty the fuel tank as follows:
Method 2
1.
2.
To prevent serious injury from fuel fires, empty fuel
tank by running engine until it stops from lack of
fuel. DO NOT attempt to pour fuel from engine.
Drain remaining fuel from carburetor by pressing up
on bowl drain if present.
Oil
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s
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or rs/3
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0
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Ev
Af
il
da
PROCEDURE:
Check oil level
Change oil
•
•
Clean foam filter
Replace paper filter
Check spark plugs
Replace spark plug
Change oil if not changed within the last 3 months. See
“Checking and Changing Oil” instructions under “Maintenance and Adjustments”.
695578
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1-7
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4-Cycle Engine Theory
Tecumseh four-cycle engines require four strokes or cycles
to complete one power cycle.
Intake
Intake valve is open, exhaust valve is closed. Piston is
traveling downward creating a suction action, drawing the
fuel-air mixture from the carburetor into the cylinder area
above the piston.
Power
Both valves remain closed. As the piston reaches the
Before Top Dead Center (BTDC) ignition point, the spark
plug fires, igniting the fuel-air mixture. In the time it
takes to ignite all the available fuel, the piston has
moved to TDC (Top Dead Center), ready to take the full
combustive force of the fuel for maximum power and
piston downward travel. The expanding gases force the
piston down.
1. Intake
Compression
3. Power
As the piston reaches Bottom Dead Center, the INTAKE valve closes. The piston then rises, compressing
the fuel and air mixture trapped in the combustion
chamber, because both valves are closed.
Exhaust
Exhaust valve opens. As the piston starts to the top of
the cylinder, the exhaust gases are forced out.
After the piston reaches Top Dead Center (TDC), the
four cycle process will begin again as the piston moves
downward and the intake valve opens.
2. Compression
NOTE
Some emission compliance engines may use an RCR
(Ramp Compression Relief) system. This system opens
the intake valve during the compression stroke allowing
a small amount of the intake charge back down the intake pipe. This eliminates unburned fuel going out the
exhaust during normal compression relief cycle typically
used on the exhaust valve.
4. Exhaust
1-8
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Chapter 2
Air Cleaners
General Information
Polyurethane Pre-Filters
WARNING It is recommended that you take
special notice of all items
discussed in the handbook and wear the
appropriate safety equipment. Failure to do so
may result in death or serious injury.
These serviceable air filters utilize a polyurethane
element which will clog up with use. The element
should be cleaned and serviced in the following manner.
Be sure dirt
surrounding air
removed before servicing. Failure
result in carburetor and/or engine
2.
CAUTION
and debris
cleaner is
to do so may
damage.
1.
Wash element in a detergent and water solution
and squeeze (don’t twist) until all dirt is removed.
Rinse thoroughly.
3.
Wrap in a clean cloth and squeeze (don’t twist)
until completely dry.
NOTE
4.
If the engine is equipped with an optional poly pre-filter
always remove it first, to prevent dirt falling into the filter
body.
Re-oil element by applying a generous quantity of
oil to all sides. Squeeze vigorously to distribute oil
and to remove excess oil.
5.
Clean air cleaner housing and cover.
Dry thoroughly.
6.
Reinstall pre-cleaner in air filter body.
Air cleaners must be serviced frequently, to prevent dust
and dirt from entering the engine. Dust mixed with the
engine oil forms an extremely abrasive compound which
quickly wears out an engine.
NOTE
A clogged air cleaner will affect engine performance.
Some vectors Are
Replacing a restricted (clogged) air filter should restore
engine performance.
equipped with a bolt
Air Cleaner Service
access hole and a plug.
Replace if removed.
The engine utilizes a treated paper element with a foam
rubber-like sealing edge. The seal must fit properly to
prevent dirt ingestion.
Replace air filter once a year or more often in extremely
dusty or dirty conditions.
Poly
Pre-Filter
Plug
Body
NOTE
Do not put oil on or clean a paper filter.
Be sure to clean base and cover thoroughly before
installing new paper filter.
DO NOT run engine without
complete air cleaner installed on
engine. Doing so may result in equipment
damage and WILL VOID the engine WARRANTY.
CAUTION
Paper
Filter
NOTE
Serious damage to the engine may result from using any
other but the specified part number filter. Use factory
recommended parts only.
Some models use a dual stage air cleaner. This air
cleaner uses a polyurethane-type foam pre-filter along
with the paper element.
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To Service Air Cleaner
1.
Loosen cover screw (A).
A
2.
Swing cover down and remove from hinge (B).
3.
Pull foam pre-filter out of air cleaner body
(if equipped with pre-filter).
4.
Pull air filter out of air cleaner body.
5.
Clean air cleaner cover and body.
6.
Install a new paper filter (part no. 36046) (C).
Pre-Filter
B
7.
Clean and install pre-filter (if so equipped).
8.
Reinstall cover to air cleaner body.
Be sure hinge is assembled properly.
9.
2-2
Swing cover up and tighten cover screw.
(Do not over tighten).
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Carburetion
General
Proper Carburetion Function is dependent on clean
fresh fuel and a well maintained air cleaner system.
Most causes of carburetion problems are directly
related to stale fuel and dirt ingestion. Inspection of the
carburetor for dirt wear and fuel deposits should always
be done before servicing the carburetor.
Manufacturing Number
and Date Code
Carburetor Identification
Tecumseh carburetors are identified by a manufacturing
number and date code stamped on the carburetor as
shown. When servicing carburetors, use the engine
model number or the manufacturing number on the
carburetor to find repair parts in the Master Parts
Manual.
TORX E-5
Stud
NOTE
Later model vector carburetor bodies are held on with
TORX E-5 Studs. You will need this socket for removal.
Use Tecumseh Part No. 670339.
The engine has used both a split system and married
system carburetor. Below are the part breakdowns for
the two carburetors.
Split
1
Ref.
No.
27
5
7
6
* 30
26
*31
47
36
37
38
25A
25
32
29
39
1
5
6
7
25
25A
26
27
29
* 30
* 31
32
36
37
38
39
47
Ref.
No.
Married
1
5
6
47
29
27
7
*30
*31
26
36
37
38
25A
25
37A
40 38A
33
32
39
1
5
6
7
25
25A
26
27
29
* 30
* 31
32
33
36
37
37A
38
38A
39
40
47
Part Name
Throttle Shaft & Lever Ass'y.
Dust Seal (Throttle)
Throttle Shutter
Throttle Shutter Screw
Float Bowl
Idle Restrictor
Float
Shaft, Float
Gasket, Float Bowl to Body
Inlet Needle, Seat & Seat Retainer (Incl. 31)
Seat Retainer
Bowl Drain Ass'y.
Tube, Main Nozzle
O Ring, Main Nozzle Tube
Spring, Main Nozzle Tube
Float Bowl Retainer
Welch Plug, Idle Mixture Well
Part Name
Throttle Shaft & Lever Ass'y.
Dust Seal
Throttle Shutter
Throttle Shutter Screw
Float Bowl
Idle Restrictor
Float
Float Shaft
Gasket, Float Bowl to Body
Inlet Needle, Seat & Seat Retainer (Incl. 31)
Seat Retainer
Bowl Drain Screw
Bowl Drain Washer
Tube, Main Nozzle
O Ring, Main Nozzle Tube
O Ring
Spring, Main Nozzle Tube
Spring
Float Bowl Retainer
Main Fuel Jet
Welch Plug, Idle Mixture Well
*NOTE: The seat retainer may not be present on some engines. If you receive a retainer as a service part, install it.
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The carburetor is a float feed, nonadjustable type, with a
one piece extruded aluminum body. The float bowl,
float, nozzle, and venturi are nonmetallic, minimizing the
corrosion and varnishing problems.
WARNING Gasoline (fuel) vapors are highly
flammable and can explode. Fuel
vapors can spread and be ignited by a spark or
flame many feet away from engine. To prevent
injury or death from fuel fires, follow these
instructions:
Air
Bleed
Holes
Split System Main Jet
Jet and Nozzle Ass'y.
• NEVER fill fuel tank indoors. Fill fuel tank
outdoors in a well-ventilated area.
• Use only an approved red GASOLINE container
to store and dispense fuel.
• If fuel is spilled, DO NOT start engine. Move
machine away from area of spillage. Avoid
creating any source of ignition until fuel vapors
are gone.
Common service areas of the carburetor are contained
in the fuel bowl. These areas are the float, needle, seat
and main nozzle. All of these parts can be serviced
without removing the carburetor body from the engine.
"O" Ring
Married System Main Jet
NOTE
Be sure to check the cross holes on the body of the
nozzle and the main orifice in the bottom of the nozzle.
WARNING Compressed air can pierce the
skin and cause injury. DO Not use
your hand to check for leaks or to determine air
flow rates. Wear safety glasses to shield from
debris. Failure to do so could result in death or
serious injury.
7.
Use a rubber tipped tapered nozzle on air hose and
apply low pressure compressed air or use a
monofilament fishing line to remove any deposits
in the main jet or cross holes.
Float Bowl Service
1.
Be sure engine is outdoors and in a well-ventilated
area.
2.
Disconnect and plug the fuel line.
3.
Remove the bowl drain screw.
4.
Remove the float bowl by snapping the bale spring
towards the throttle end of the carburetor.
NOTE
Use care when using tools to remove the bail from the
carburetor. Failure to do so may result in bending the
retainer.
After the bowl gasket is removed, the parts contained in
the bowl can be inspected and serviced.
5.
Pull out the main nozzle and spring.
6.
Inspect the main nozzle for deposits.
2-4
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8.
Remove the drain screw to access the spring, jet
and "O" ring.
Idle Passage
The main jet should be inspected and cleaned if deposits exist.
NOTES
Main Nozzle
The float is held in the float bowl by the float pin which is
pressed into tabs on top of the float support towers.
When removing float from float bowl, pull straight up with
a needle nose pliers in the pocket closest to the main fuel
well.
9.
Carefully lift the float out of the float bowl and
inspect for damage or deposits.
10. Clean the idle passageway with compressed air, or
with tag wire.
Float
Hinge Pin
Inlet needle seats at this point.
NOTES
The inlet needle is attached to the float and should also
be inspected for damage or deposits.
Insert grooved
face first.
The inlet seat can be removed with a small wire hook or a
#2 crochet hook.
Inlet Seat
11. Inspect the float bowl and main nozzle area for
sediment and deposits.
Retaining Clip
12. Use a carburetor cleaner to loosen and remove
deposits and sediment.
Idle Passage
NOTES
The grooved side of the inlet seat goes into the float bowl
first.
Use care when installing inlet seat into float bowl. Failure
to do so may result in scratching the inlet bore.
5/32" (3.9 mm)
Flat Punch
13. Install a new inlet seat into the float bowl.
14. Place a drop of oil on the seat and press it in with
a flat punch until it seats.
NOTE
Some models are equipped with a fuel inlet seat retaining
ring. If your replacement seat set comes with a retaining
clip install it on top of the seat.
15. Slide the inlet needle into the tabs on the float and
put the float pin into the hinge on the float. Carefully
set the float into position in the float bowl.
Seat
Press in until
seat rests on
body shoulder.
Inlet needle
seats at
this point.
Retaining Clip
Insert grooved
face first.
16. Verify needle drops into the fuel inlet.
17. Snap the float shaft into the tabs in the float bowl.
NOTE
It is not necessary to adjust the float height even if the
float has been replaced.
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18. Drop the main nozzle spring into the main nozzle
well in the float bowl. Put a small amount of oil on
the main nozzle “O” ring and push the nozzle into
the main nozzle well, “O” ring end first.
Split System
Main Nozzle
Bleed/Jet
Gasket
Alignment
Marker
3.
Disguard gasket.
4.
Disconnect and plug the fuel line.
5.
Remove the carburetor mounting studs.
6.
Remove the governor link.
7.
Drain the carburetor float bowl.
8.
9.
Disassemble the float bowl
See Float Bowl Service.
NOTE
"O" Ring In Groove
Spring
To properly clean the carburetor body, the welch plugs
should be removed to expose drilled passages.
Removing Welch Plug
Bowl
Drain
In addition to this, the married system carburetor has
the "O" ring, main jet, and spring located behind the
drain system.
1.
Sharpen a small chisel to a sharp wedge point.
2.
Remove welch plug.
3.
Drive the chisel into the welch plug.
a. Push down on chisel
b. Pry plug out of position.
NOTE
Married System
Small Chisel
"O" Ring
Jet Spring
Drain Screw
Gasket
19. Place a new gasket on top of the float bowl with the
notch on the gasket aligned with the bump on the
bowl edge.
NOTE
The gasket will only fit onto the float bowl one way
20. Hold the float bowl to the carburetor body and snap
the retainer into position.
21. Reinstall the bowl drain screw, do not over tighten.
22. Reattach the fuel line.
NOTE
Bowl service is all that is normally required for routine
carburetor maintenance.
Rebuilding The Carburetor Body
Before disassembling the carburetor body, check the
throttle shaft and body for excessive wear. If there is
excessive wear to the throttle body, it should be replaced.
To rebuild the carburetor body it is necessary to remove
the carburetor from the engine.
1.
Remove the speed control plate.
2.
Remove the air cleaner body from the carburetor.
2-6
Pry Out Plug
Do not allow chisel
point to strike
carburetor body or
channel reducer.
Welch plug to be
removed.
Small Chisel
Always pull the non metallic venturi out before soaking in
carburetor cleaner.
After the welch plug is removed from the carburetor it can
be soaked in a commercial carburetor cleaner no longer
than 30 minutes. Be sure to follow the directions on the
container.
4. Reinstall the venture using the main nozzle to align it
correctly.
NOTE
The air bleed passages face the air filter.
WARNING Compressed air can pierce the
skin and cause injury. DO Not
use your hand to check for leaks or to determine
air flow rates. Wear safety glasses to shield form
debris. Failure to do so could result in death or
serious injury.
After the carburetor has been soaked, all passages may
be probed with monofilament fishing line and compressed
air to open plugged or restricted passages.
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Install a new welch plug over the idle fuel chamber
with the raised portion up. Use a punch equal to
the size of the plug, to flatten the plug.
NOTE
5.
To rebuild the Float Bowl, refer to the previous section on
Float Bowl Service.
Always discard gaskets after
removal. We do not recommend
using the same gasket twice. Failure to do so
may result in improper mating of parts and
equipment malfunction.
CAUTION
Flat End Punch
Same
Diameter of Plug
New Welch Plug
8.
Grasp primer bulb with a pair of needle nose pliers.
Twist and pull bulb outward to remove.
9.
Carefully remove retaining ring with a screwdriver.
Do not dent or drive the center
of the plug below the top surface
of the carburetor. Doing so will result in damage
to the plug and/or carburetor malfunction.
CAUTION
NOTES
To insure a good seal on this plug, we recommend coating
the seam with nail polish which is gas resistant.
Use a new shutter screw and dust seal when installing
the throttle shaft and shutter.
Verify scribe mark on shutter is in
the 12 o’clock position when
installing the throttle shaft and shutter. Failure to
do so may result in a shutter that sticks.
CAUTION
10. Discard bulb and retaining ring.
6. Install the throttle shaft and shutter.
7.
Verify the scribe mark on the shutter is in the
12 o’clock position.
NOTE
Newer style carburetors use A TORX T-10 Screw.
NOTE
Always thoroughly clean primer passages after servicing
primer bulb and/or air cleaner body.
11. After the primer bulb is removed, clean the primer
passages thoroughly.
12 O'clock Position
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12. Install the carburetor to the engine using a new
gasket.
NOTE
Always replace the primer bulb when servicing carburetor.
NOTE
The breather system hose
must be reconnected here.
13. Press the new bulb and the new retainer into position
using a deep reach socket as shown.
14. Install the air cleaner body over the carburetor.
NOTE
The VLV models use a closed loop breather system. The
crankcase breather tube must be reconnected to the air
filter body.
2-8
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Chapter 3
Governors and Linkage
General Information
All Tecumseh 4-cycle engines of recent manufacture are
equipped with mechanical type governors. As the
speed of an engine increases, centrifugal force moves
the weights outward, lifting up the governor spool which
contacts the governor shaft; this in turn closes the
throttle. As engine speed decreases, the weights are
pulled inward by the spring which opens the throttle.
Thus, the engine speed controls the throttle opening
and maintains a certain governed speed.
Center Force Governor
Type I
Spool
VLV Type II
Spool
Retaining
Ring
Upset
Retainer
Gear Ass'y.
(Gov.)
Shaft
Gear Ass'y.
(Gov.)
Washer
Washer
Idler Gear
NOTE: Gear assembly must have .010 - .020 (.254 - .50 mm) end
play after shaft is installed into flange.
TYPE II governors do not use governor retainer clips.
The spool is retained by a raised upset on the shaft.
The governor gear on this engine is driven by the
crankshaft through an idler gear as shown below.
WARNING Wear eye protection and verify
setup is stable when using a
press. The pressure from the press could cause
parts to fly out with great force. Inadequate
safety precautions could result in death or serious
injury.
The governor shaft is pressed into the flange or cover to
a specific dimension as shown below.
Idler Gear
Governor Shaft
Idler Shaft
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Press Depth
1.319 (33.5 mm)
1.334 (33.9 mm)
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Linkage Assembly/Disassembly
Speed Controls
NOTES
This engine has an adjustable speed control.
The solid link is always connected from the throttle lever
on the carburetor to the lower hole on the governor lever.
The shorter bend has to be toward the governor.
The governor extension spring is connected with the spring
end hooked into the upper hole of the governor lever and
the extension end hooked through the speed control lever.
WARNING Never exceed the manufacturer’s
recommended speeds. Failure to
do so may cause equipment damage and could
result in death or serious injury.
NOTE
Governor adjustment screw will be TORX Head T-10
(effective August 1, 1996 for E.C. Compliance).
Bending or distorting the governor
extension spring may result in
engine damage and require engine replacement.
CAUTION
To remove the governor spring, carefully twist the
extension end counterclockwise to unhook the extension
spring at the speed control lever.
Twist Counterclockwise
Disconnect
High Speed Adjustment Counterclockwise
Increases Speed
to
Governor Spring
–
–
Low Speed Adjustment Counterclockwise
Increases Speed
Short Bend
Long Bend
Governor Adjustment
1.
Verify engine is stopped.
2.
Loosen the screw holding the governor clamp and
lever.
3.
Turn the clamp clockwise.
a. Push governor lever connected to the throttle
to a full wide open throttle position.
b. Hold the lever and clamp in this position.
c. Tighten the screw.
3-2
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Chapter 4
Starters
Disassembly and Inspection
1.
Remove the rewind assembly from the engine.
2.
Use the handle to pull a length of rope out.
3.
Tie a temporary knot in the exposed rope.
4.
Untie the knot in handle or pry out the staple.
5.
Slowly allow the rope to fully retract into the starter
housing.
6.
Allow the recoil spring to fully unwind.
Reinstall Retainer Pin
1/8"(3.2 mm) From Top
Double
Knot
7. Remove the decal from the center of the starter
housing
8. Place a 3/4'’ (19 mm) deep reach socket under the
retainer pawl.
9. Set the rewind on a bench, supported on the socket.
Dog Spring
10. Using a 5/16'’ (8 mm) roll pin punch, drive out the
center pin.
11. Inspect all components.
Friction Washer
Starter Dog
Retainer Cover
12. Replace all components that are in need of service.
NOTE
This Rewind Spring is not in a canister.
Spring
Washer
Retainer Pin
Care must be used when handling the pulley; the rewind
spring and cover are held together by the bosses in the
pulley.
Assembly and Inspection
NOTE
Always replace the decal or plug over the retainer pin or
wedge to prevent moisture infiltration.
1. Reverse the above listed procedure keeping in mind
that the starter dogs with the dog springs must snap
back to the center of the pulley.
Always discard center pin and
CAUTION
plastic washers after disassembly.
We do not recommend using these parts twice.
Failure to do so may result in equipment failure.
2. Always replace the center pin with a new pin upon
reassembly. Also place the two new plastic washers
between the center leg and retainer pawl. Discard
old plastic washer. The new plastic washers will be
provided along with the new center pin.
3. Inspect retainer pawl. If it is worn, bent or damaged
in any manner replace upon reassembly.
NOTE
Driving the center pin in too far will cause the retainer pawl
to bend and the starter dogs will not engage the starter
cup.
4. Install the new center pin in until it is within 1/8" (3.2
mm) of an inch of the top of the starter.
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Stylized Rewind Starter with Plastic
Retainer
Retainer Wedge
Disassembly and Inspection
1.
Remove the rewind assembly from the engine.
2.
Use the handle to pull a length of rope out.
3.
Tie a temporary knot in the exposed rope.
4.
Untie the knot in handle or pry out the staple.
5.
Slowly allow the rope to fully retract into the starter
housing.
6.
Allow the recoil spring to fully unwind.
Starter
Housing
Starter Pulley
Spring & Cover
7. Remove the decal from the center of the starter
housing.
Dog Spring
8. Use a small Phillips screwdriver or similar tool to pry
the retainer legs apart and lift out the retaining wedge.
Starter Dog
9. Pinch the legs of the retainer together and pull on the
head of the retainer to remove it from the housing.
Dog Retainer
10. Remove the pulley assembly from the recoil housing.
NOTE
11. Inspect all components.
12. Replace all components that are in need of service.
Assembly and Inspection
Always replace the decal or plug over the retainer pin or
wedge to prevent moisture infiltration.
1. If replacing the starter rope, see Step 8.
WARNING It is recommended that you use
extreme care when servicing
recoil springs and wear the appropriate safety
equipment. Failure to do so may result in death
or serious injury.
Retainer Wedge
Starter
Housing
2. Install a new recoil spring if necessary by pushing
the new spring out of the holder into the pulley cavity
while aligning the outside spring hook into the deep
notch in the pulley.
3. Push the spring cover in until seated.
Starter Pulley
Spring & Cover
4. Apply a small amount of lithium grease to the inner
bore of the center shaft.
Dog Spring
5. Replace or check that both starter dogs are in the
pulley pockets and that the dog springs are hooked
on the outer surface of the dog.
Starter Dog
Double
Knot
6. Pinch the two legs of the plastic retainer together and
start into the center shaft hole.
Dog Retainer
7. Rotate the retainer so the two tabs on the bottom of
the part fit between the dog and pulley hub (left side
of the dog). Push the retainer in until the leg prongs
pop out of the center shaft.
8. Turn the starter over and snap the locking tab between
the retainer legs, replace the top decal.
4-2
9. Carefully turn the pulley counterclockwise until it stops.
Then back the pulley up until the recoil grommet hole
and the pulley hole are aligned. Next using a rope
with a cauterized end, feed it into the pulley hole. Tie
a double handed knot and allow the rope to be drawn
into the recoil slowly.
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12 Volt Electric Starters
Removal
Parts List:
1.
Remove face plate, air cleaner assembly and gas
tank.
1.
Retainer ring
2.
Dust washer
2.
Compress plastic grommet and pull it out of the
blower housing.
3.
Drive nut
3.
Slide the wire through slot, being careful not to cut
the wire insulation.
4.
Pinion driver
5.
Gear
4.
Remove blower housing, remove flywheel (see
flywheel section) and inspect ring gear for wear or
damage. Replace if necessary. See Flywheel
Section.
6.
Anti-drift spring
7.
Spring retainer (spring collapses into retainer)
8.
Cup washer (cup washer cupped over retainer
spring)
9.
Washer (metal)
5.
Remove nuts on both sides of pinion.
6.
Drop starter out of back plate and remove ground
wire.
10. Retainer ring
11. Thrust washer (metal)
12 Washer (plastic)
13. Lock nuts
14. Cap assembly drive end
15. Armature
16. Housing
17. End cap and brush card assembly
18. Bolts
Drive Assembly Service
Pinion gear parts should be checked for damage or
wear. If the gear does not engage or slips, it should be
washed in solvent. Rubber parts are to be cleaned with
soap and water to remove dirt and grease, and dried
thoroughly. If any parts are damaged, discard and
replace with new parts.
Use reverse of Electric Starter Removal procedure for
assembly.
NOTE
Assemble armature into brush end frame first.
DO NOT apply lubricant to pinion
driver (4). Doing so may result in
equipment malfunction.
CAUTION
Place a small amount of light grease such as lubriplate
between the drive nut (3) and helix on armature shaft.
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Check Brushes
Armature Check
Before disassembling armature, check brushes for wear.
• Make sure brushes are not worn to the point
where brush wire bottoms out in the slot of
brush holder.
If commutator bars are glazed or dirty, they can be
turned down in a lathe.
•
•
•
Brush springs must have enough strength to
keep tension on the brushes and hold them
against the commutator.
While rotating, hold a strip of 00 sandpaper
lightly on the commutator, moving it back and
forth.
NOTE
Do not use emery cloth.
If brushes are in need of change, replace the
entire end cap assembly.
•
Recut grooves between commutator bars to
depth equal to the width of the insulators.
1.
Using a continuity tester to make certain no
continuity exists between the commutator (copper)
and the iron of the armature
2.
Rotate armature and check out all commutator
bars.
NOTE
The armature can be thoroughly checked with a growler if
available.
End Cap and Brush Assembly
4-4
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Assembly
1. Attach the ground wire prior to assembling the electric
starter to the baffle.
Starter Prongs
2. Attach the black ground wire to the electric starter
through bolt so the wire extends between the two
adjacent end cap prongs.
3. Place the starter into the back plate with the ground
wire bolt away from carburetor.
NOTE
The throttle linkage is routed around starter while the governor spring is routed through the end cap prongs.
4. Tighten nuts on starter bolts (see Specifications).
5. Place blower housing on engine and slide wires
through slot making sure not to cut insulation.
Attach Ground
Wire
Attach Battery Ground
Lead to Electric Starter
Motor Stud before
attaching to Blower
Housing Baffle.
6. Press grommet into hole.
7. Reassemble gas tank, air cleaner assembly and face
plate.
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NOTES
4-6
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Chapter 5
Flywheels
General Information
Disconnect negative battery cable
WARNING before servicing. If the positive
battery cable contacts ground
with the negative cable connected it may cause
a battery explosion which could result in death
or serious injury.
This engine uses one of two types of flywheels.
High Inertia Flywheel
The first type is cast iron. This type of flywheel will have
a pressed-on steel ring gear.
NOTE
Drop pin through to disengage brake.
If the engine is equipped with an electric starter the steel
ring gear is nonserviceable.
Diecast Aluminum Flywheel
The second and most popular style of flywheel is diecast
aluminum. The aluminum flywheel features a replaceable
plastic fan.
NOTE
If the engine is equipped with an electric starter the plastic ring gear is nonserviceable.
Removal
1.
Remove the ignition module.
2.
Remove the brake pressure from the flywheel.
The brake can be locked in the disengaged position by
placing a pin into one of the aligned holes in the backing
plate lever assembly.
3.
To remove the flywheel nut, use a flywheel strap
wrench (Part No. 670305) to hold the flywheel,
while turning the flywheel nut counterclockwise.
4. Lift the starter cup and fan off of the flywheel.
(Aluminum flywheel only)
5. Remove the flywheel using a flywheel puller or
knock-off tool.
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Cored Holes
Installation
On engines with cored holes (untapped) use flywheel
puller Part No. 670306.
1.
1.
Screw the knock-off (Part No. 670169) tool down
until it touches the flywheel.
2.
Back off one turn.
If pad is contaminated, or less than .060'’ (1.52 mm) at
the narrowest point, replace pad. See Brake Pad Replacement Section.
3.
Using a large screwdriver, pry upward under the
flywheel (side opposite the brake) and tap sharply
and squarely on the knock-off tool to break the
flywheel loose.
Inspect brake pad to be free of dirt, oil or grease.
NOTE
2.
Compress brake lever
3.
Install flywheel key
NOTE
If necessary, rotate flywheel a half turn and repeat until it
loosens.
Crankshaft Keyway
Do not attempt to remove
flywheel using a jaw type puller
on the outer diameter of the flywheel. Doing so
may result in flywheel breakage.
CAUTION
Flywheel Key
P/N 611154
Never use a pry bar with any type
of curve on the end. Doing so
may result in Breather cover damage.
CAUTION
Install into Keyway
as shown
4.
Install flywheel
5.
Install the fan onto the flywheel so the Tecumseh
logo on the fan is on the magnet side of the
flywheel.
F
O
R
Magnet
6.
5-2
Place starter cup into position and torque the
flywheel nut to specification. Use a strap wrench to
hold the flywheel.
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Brake System
Stopping the Engine
Tecumseh’s Flywheel Brake System provides consumer
safety by shutting down the engine and lawn mower
blade within seconds after the operator releases an
engine/blade control at the handle of the lawn mower.
In the stop position the brake pad is applied to the
inside edge of the flywheel; at the same time the ignition
system is grounded out.
The Brake/Starter Mechanism is used with either of two
options for starting:
1.
Manual Recoil Start
2.
12 Volt Electric Starter System
Brake Pad
Ground Clip
Each system requires the operator to start unit behind
mower handle in operator zone area. The electric start
system also provides a charging system for battery
recharge when engine is running.
NOTE
Electric start systems equipped with a charging system
WILL NOT RECHARGE a dead battery. This system is
designed to maintain the charge. Before storage and again
in spring the battery should be charged with the O.E.M.
supplied charger.
Ignition
Ground
Wire
"Brake On"
To Start Engine
In order to restart the engine, the engine/blade control
must be activated. This action pulls the brake pad away
from the inside edge of the flywheel and opens the
ignition ground switch.
NOTES
On electric start systems the starter is energized to start
the engine.
On recoil start systems, recoil starter rope must be pulled
to start engine.
Brake Pad
Ground Clip
Ignition Ground
Wire
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Wiring Diagrams
Brake Pad Replacement
(Electric Start Systems). All wiring beyond the
connectors on the engine are supplied by the equipment manufacturer. Check all terminals and connectors for corrosion and adequate contact, and all wiring
for damage and proper size.
1. If equipped with electric starter, locate wire routing
through blower housing. Compress the grommet and
pull it out of the blower housing. Carefully slide wires
through the slot. DO NOT cut the wire insulation on
the blower housing.
KEYSWITCH CONTROL
Alternator
Lead
Ignition Short Outlead
Ignition Short-Out Switch
Electric Starter
Lead
Battery Ground
VIEW A-A
Charging Rectifier
Ignition Short-Out Lead
Battery Ground
Ignition Short-Out Lead
Alternator Lead
2. Remove the flywheel (see flywheel removal.)
3. Remove pad lever “E” clip. Lift pad lever, and unhook
spring and link.
4. Attach the link to the new pad lever; install pad lever
and “E” clip.
5. Attach spring to lever first. Use a needle nose pliers
to hook the spring into the baffle.
Starter Motor
(Internally Grounded)
Starter Interlock Switch
Ignition
Short-Out
Lead#13
A.W.G.
(Optional)
Electric Starter Lead
RED #12 A.W.G.
Heavy Duty Switch
Battery
(12 VOLT)
Red #12
A.W.G.
Pad Lever "E" Clip
Alternator Lead
Red #18 A.W.G.
Black #12
A.W.G.
Brake Lever "E"
NOTE
All Ground Connections must be cleaned to a bright finish.
Battery
Short Hook
Check battery per manufacturer’s recommendations.
The charging system on the engine maintains the
battery during normal use.
When battery is low, use the 120 volt auxiliary charger
(usually supplied by the equipment manufacturer).
5-4
Long Hook
NOTE
It is important to attach the pad lever spring with the short
hook on the pad lever and the long hook to the blower
housing baffle.
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Brake Control Lever Replacement
Control Switch
1.
Mark hole that spring is installed into baffle.
2.
Remove “E” clip from brake lever shaft.
The brake lever must close the switch before the
starter can be engaged.
3.
Lift brake control lever and unhook link.
Disconnect battery from circuit before making check.
Engines equipped with an electric starter have a
control switch that is attached to the brake lever. The
brake lever must close the switch before the starter
can be engaged.
Checking Control Switch
Brake Lever Control Spring
1.
Disconnect the battery from the circuit.
2.
Use a continuity light or meter to check control
switch operation.
3.
Disconnect the wire harness at the engine.
4.
Attach one continuity light lead to the electric
starter lead. See illustration on previous page.
5.
Attach the other continuity light lead to the
battery ground lead.
6.
With leads attached, press the control switch
lever and the continuity light should turn on.
NOTE
4.
Replace with new lever and reassemble in reverse
order.
5.
Replacement springs must be the same size and
color.
6.
Be sure control lever spring is in proper hole in
blower housing baffle before reassembly.
If continuity light does not turn on replace control switch.
Brake Lever Control Link Attachment
Check
Continuity
Electric Starter
Control Switch
Brake Lever End
Pad Lever End
When removing the brake lever with a reverse pull brake,
the pad lever must be removed to unhook the brake link
from the brake lever.
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Chapter 6
Alternator
Alternator
Troubleshooting Electric Start Engines
The 350 Milliampere charging system consists of a
single alternator coil mounted to one side of the solid
state module.
The following is a list of possible problems and causes.
Alternator
Lamination Screws
Solid State Module
Dead Battery
Extended storage without charging
Excessive cranking
Faulty starter
Faulty wiring
Ignition Coil
Lamination Screw
Faulty alternator
Faulty battery
Battery O.K., Engine Won't Crank
Brake cable defective
Faulty starter switch
Alternator Coil
Poor electrical connections
NOTE
This charging system is designed to maintain a charged
battery. Most O.E.M.'s supply a trickle charger, which
should be used before and after off-season storage. This
system will maintain the charge level under normal use
conditions.
Do not operate engine with
CAUTION
charging system disconnected.
Doing so may result in damage to diode.
Faulty starter. See starter section
Engine Cranks Slowly
Weak or discharged battery
Faulty starter
Troubleshooting for Both Mechanical and
Electric Start Systems
If Engine Pulls or Cranks Hard
Excessive engine drag due to obstructions under
deck.
System Checking
NOTE
Set volt/ohm meter to 0-20 volt D.C. scale for test.
The battery MUST BE IN CIRCUIT for test to perform
properly.
1.
Connect voltmeter at the battery (should read
battery voltage).
2.
Next, start engine -voltage should read higher than
when engine is off.
NOTES
If there is a change upward in voltage, the charging system is working.
Mower traction drive mis-adjusted
Valve clearance too wide
Compression release not functioning
Flywheel brake is still applied
Maximum compression should be 90 PSI (6.2 Bar). If
compression is higher, de-carbon the valve seat and
head area and check valve clearances. Exhaust valve
clearance may be set as low as .004'’ (.10 mm) if
necessary to gain more compression relief. If compression is still above 90 PSI (6.2 Bar), check the camshaft
compression relief mechanism.
If there is no change in voltage, the alternator should be
replaced.
6-1
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Chapter 7
Ignition
Solid State Ignition
Tecumseh’s solid state capacitor discharge ignition
(CDI) is an all electronic ignition system and is encapsulated in epoxy for protection against dirt and moisture.
Solid State Ignition Operation
As the magnets in the flywheel rotate past the charge
coil, electrical energy is produced in the module. This
energy is transferred to a capacitor where it is stored
until it is needed to fire the spark plug.
The magnet continues rotating past a trigger coil where
a low voltage signal is produced and closes an electronic switch (SCR).
The energy which was stored in the capacitor is now
transferred through the switch (SCR) to a transformer
where the voltage is increased from 200 volts to 25,000
volts. This voltage is transferred by means of the high
tension lead to the spark plug, where it arcs across the
electrode of the spark plug and ignites the fuel-air
mixture.
Spark Plug Service
Spark plugs should be replaced periodically. Check
electrode gap with wire feeler gauge and adjust gap to
.030" (.762 mm). Replace if electrode is pitted, burned
or the porcelain is cracked. Refer to Master Parts
Manual for correct replacement number. Use a spark
plug tester to check for spark.
If spark plug fouls frequently, check for the following
conditions:
1.
Incorrect spark plug
2.
Poor grade gasoline
3.
Breather plugged
4.
Oil level too high
5.
Engine using excessive oil
6.
Clogged air cleaner
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The proper air gap setting between magnets and the
laminations on CDI systems is .0125'’ (.313 mm). Install
gauge, Tecumseh Part No. 670297 between the magnets
and laminations and tighten mounting screws to a torque
of 30-40 inch pounds (3-4.5 Nm). Recheck gap setting to
make certain there is proper clearance between the
magnets and laminations.
Ignition Timing
The flywheel key is what times the ignition for the
engine. If this key is partially sheared from striking an
object with the blade, the timing and engine performance could be affected. The key should be inspected
if a performance problem exists.
Crankshaft Keyway
Flywheel Key
P/N 611154
Install Into
Keyway as
Shown
7-2
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Chapter 8
Piston, Rings and Connecting Rods
Piston and Rings
Use extreme care when handling
piston. Any scratches, gouges or
other marks could score the cylinder during
operation and result in engine damage.
CAUTION
1.
Before removing piston, clean any carbon from the
top of the cylinder bore to prevent ring breakage
when removing the piston.
2.
Push the rod and piston out through the top of the
cylinder.
Oversize pistons are identified by the size imprinted on
the piston as shown.
3.
4.
.010
(2.54 mm)
Indicates .010 (.254 mm)
Oversize Piston
Piston measurements are taken at bottom of skirt 900
from wrist pin hole
1st Compression Ring
Check the piston for wear by measuring at the
bottom of the skirt 90o from the wrist pin hole.
Side Clearance
Clean the carbon from the piston ring grooves,
install new rings and measure side clearance.
NOTE
3rd Oil Control Ring
2nd Compression Ring
Tolerances are listed in the table of specifications.
Barrel Faced Top Ring
Always use new piston rings
when servicing piston. When
reused, old piston rings may weaken, break or
dislodge resulting in engine damage.
CAUTION
5.
Replace rings in sets and always stagger ring
gaps.
6.
When installing new rings, deglaze cylinder wall,
using a commercially available deglazing tool.
7.
Use a ring expander to remove and replace rings.
CAUTION
Scraper Ring
Oil Control Ring
NOTE
Emission Compliant VLV uses this
ring package.
Do not spread the piston rings
too wide. Doing so may result in
ring breakage.
The top compression ring will have a chamfer on the
inside edge.
NOTE
Cylinder
The top compression ring must be installed with the chamfer side up.
8.
To check ring end gap, place ring squarely in
center of ring travel area.
9.
Use the piston to push the ring down into the
cylinder at least one inch.
Piston
Piston Ring
10. Check ring gap on new ring to determine if cylinder
should be rebored to take oversize parts.
11. See Table of Specifications.
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Connecting Rods
Match Marks
Do not attempt to straighten bent
CAUTION
connecting rods. Doing so will
damage the cylinder and piston beyond repair.
Match marks on connecting rods must always align and
must face outward toward the mechanic when installed
in an engine.
A new piston can be installed on the connecting rod in
either direction.
If the old piston is reused, install the piston to the
connecting rod so that the piston will be in the same
position when reinstalled in the engine.
Match Marks
If it is necessary to replace the connecting rod be sure
to mark the valve side of the piston.
8-2
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Chapter 9
Cylinders and Cylinder Heads
Cylinder Service
Cylinder Heads
Check cylinder for dirty, broken or cracked fins, worn or
scored bearings or scored cylinder bore surface, and
warped head mounting surface.
Check cylinder heads for warpage by placing on a flat
surface. If the cylinder head gasket surface is warped in
excess of .005 inches (.13 mm), replace the head.
If cylinder bore is out-of round, scored or worn more
than .005'’ (.13 mm) oversize, it should be replaced or
rebored to .010 (.254 mm) or .020 (.50 mm) oversize. In
some cases engines are built with an oversize cylinder;
in these instances they are identified with the oversize
value imprinted on the cylinder as pictured. Service
pistons have the oversized valve marked on the dome.
The numerical order for gradually
removing and tightening head
screws on the cylinder head is critical for proper
distribution of pressure over gasket area. It
prevents stud failure, gasket leaks including head
and cylinder distortion.
Do not use valves with
undersized margins. Doing so
may result in a valve that does not seat normally,
burns easily, and can also lead to valve cracking.
CAUTION
Indicates .010 (.254 mm) Oversize Piston
CAUTION
Always replace head gasket and torque head bolts in 50
inch lb. (5.6 Nm) increments in the numbered sequence
to a torque of 180-220 inch lbs. (20.3 - 25 Nm).
Only a thin oil film is allowed to
remain on cylinder head screws.
Excess oil will pool in the head screw sleeve,
preventing proper torque application and full
thread engagement.
CAUTION
Torque in Numerical Order
.010
(.254 mm)
4
7
2
1
Reboring
NOTE
5
6
To rebore cylinder we recommend using a reputable machine shop or service center.
3
After reboring, hone the cylinder with 380 grit stone to
obtain a good cross hatch pattern for proper ring
seating.
Clean cylinder with soap and water, and dry thoroughly.
Replace piston and piston rings with correct oversize
parts as indicated in parts manual.
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Chapter 10
Crankshafts, Camshafts and Lubrication
Crankshafts
Camshaft Removal
Do not attempt to straighten a
bent crankshaft. Doing so will
damage gears, and result in engine failure.
Align timing marks to relieve valve train pressure. Lift
out cam.
CAUTION
Inspect crankshaft for worn, scratched or damaged
bearing surfaces, out-of-round or flat spots on the
journal area, or a bent P.T.O. end.
When servicing crankshaft,
lubricate all bearing surfaces
prior to assembly. Leaving these parts dry could
accelerate wear at start-up.
CAUTION
When installing a crankshaft, lubricate all bearing surfaces
and use oil seal protector part no. 670327.
Crankshaft Timing Mark
The crankshaft has a pressed-on timing gear. This gear
has a small dimple punched on one of the teeth on this
gear.
2:30
The camshaft has a mechanical compression release
mechanism. A pin which runs through both cam lobes
extends past the exhaust lobe and lifts the valve to relieve
compression for easier starting. When the engine starts,
centrifugal force moves the flyweight outward, moving the
pin below the lobe, allowing full compression.
NOTES
The compression release mechanism is nonserviceable.
Replace camshaft assembly if damaged or worn.
The camshaft has been relieved in the intake lobe area.
This change was made to accommodate added crankshaft
counterweight material for improved engine balance.
This dimple is a timing mark. With the crankpin at top
dead center, the timing mark should be in the 2:30
position.
NOTE
Timing marks on crankshaft gear and camshaft gear must
be aligned for proper valve timing.
10-1
Crankshaft
Counterweight
Relief
Compression Release
Mechanism
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Lubrication System
Oil Pump
All Tecumseh Vertical shaft 4-Cycle engines use a
positive displacement plunger oil pump to pump oil from
the crankcase, up through the camshaft to a passage
in the breather box to the top crankshaft main bearing.
An eccentric on the camshaft works the plunger in the
barrel back and forth, forcing oil up the center of the
camshaft. A ball on the end of the plunger locates in a
recess in the flange cover.
NOTE
When installing oil pump, make certain the chamfered
side of the pump barrel faces the camshaft, and the
plunger ball seats in the recess of the flange cover.
From Camshaft
Chamfer Up
Oil Mist Hole
Oil Passage
Main Bearing Lube Hole
Oil is pressure sprayed out of a small hole between the
crankshaft and ultra-balance bearing, to lubricate the
connecting rod journal area. If a heavy leakage is noted
from the breather cover, check for plugged mist hole.
This engine has a top mounted integral breather.
Breather Oil Return Hole
Oil Return
Oil Drain Hole
Filter Element
Breather Tube
Breather Check Valve
Spray Mist Hole
695578
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The breather compartment is located under the
flywheel. A check valve allows excess crankcase
pressure to be vented through the element and out
the breather tube. The breather tube is connected to
the air cleaner body.
Condensed oil vapors are returned to the crankcase by
means of the oil return hole. The oil return hole is
opened and closed in the cylinder by the piston.
The breather filter element can be cleaned using
solvent.
NOTE
NOTE
DO NOT pinch filter element when servicing air cleaner
body. Doing so may result in leakage.
When reinstalling the check valve, apply oil to aid in assembly.
A new breather valve body can be pressed into the
block to replace a damaged breather valve body.
Breather Tube Connection
NOTE
Always reconnect the breather tube.
Oil Return Hole
10-3
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Chapter 11
Valves, Lifters, Spring and Valve Seats
GeneraI Information
Valves must be in good condition, proper sealing and
proper gap must be maintained for full power, easy
starting and efficient operation.
Exhaust
Valve
Valve Removal
To remove valves, use a commercially available valve
spring compressor. Move the lower cap, so it will slip off
the end of the valve.
46o
Clean all parts and remove carbon from valve heads and
stems. If valves are in usable condition, grind the valve
faces to a 45o angle.
Intake
Valve
NOTES
It is important to remove no more metal than required to
clean up and true the valve face.
See Specifications Section for
Dimensions
Replace valves if they are damaged, distorted or if the
margin is ground to less than 1/32'’ (.79 mm).
Replace the valve if end of valve stem shows uneven wear.
After valves have been ground, handle with care to prevent damage to the ground faces.
Bottom
Narrowing Cutter
Do not use valves with
undersized margins. Doing so
may result in a valve that does not seat normally,
burns easily, and can also lead to valve cracking.
15o
CAUTION
60o
Valve Seats
Seat
Margin
Bottom
Narrowing
45o
1/32" (.79 mm)
Minimum Dimension
Second, use the 31o cutter to clean and narrow the seat
from the top toward the center.
Face
Top Narrowing Cutter
46o
31o
Stem
Valve seats are not replaceable. If they are burned or
pitted, they can be reground using a grinding stone or
valve seat cutter.
The recommended procedure to properly cut a valve
seat is to use the Neway Valve Cutting System, which
consists of three different degree cutters. First, use the
60o cutter to clean and narrow the seat from the bottom
toward the center.
695578
Seat
Seats are ground at an angle of 46o, to a width of 3/64"
(1.19 mm).
11-1
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Seal Cutter
Face
31o
46o
Wrong
)
4"
3/6 9 mm
(1.1
Right
Seat
Valve Lifters
Valves are not identical. Make sure the valve marked
“EX” or “X” is installed in the exhaust valve location, and
the valve marked “I” is installed in the intake valve
location. If the valves are unmarked, the nonmagnetic
valve is installed in the exhaust valve location.
Valve Adjustment
Clearance between the valve stem and lifter must be set
to the recommended specifications when the engine is
cold (see page 40). Check these clearances with the
piston T.D.C. on the compression stroke. Grind end of
valve stem with a valve grinder, or use a “V” block to hold
the valve square on grinding wheel, grinding to the proper
.004" to .008” (.101 - .203 mm) clearance.
NOTE
Some emissionized engines use intake valve stem seals
to maintain proper oil control and emission compliance,
They must be replaced if the valve has been removed.
It is a good practice not to interchange lifters, even
though they are identical, once a wear pattern has been
established.
Oversize Valve Guides
Valve guides are permanently installed in the cylinder. If
they become worn excessively, they can be reamed
oversized to accommodate a 1/32'’ (.79 mm) over size
valve stem.
1.
Ream guides with a straight shanked hand reamer
or low speed drill press.
2.
Refer to Table of Specifications to determine
correct oversize dimension.
Reamers are available through your Tecumseh parts
suppliers.
3.
See Tool Section for correct part numbers.
4.
After oversizing valve guides the seats must be
recut to align with the valve guides.
Valve Installation
1.
To reinstall valves, position valve caps and spring in
the valve compartment.
2.
Install valves in guides with valve marked “I” in the
intake port. The valve stem must pass through the
spring. The valve spring cap should sit around the
valve lifter exposed end.
WARNING Use extreme care when servicing
any springs. Wear the appropriate
safety equipment. These springs may be highly
compressed and could fly out with considerable
force. Failure to do so may result in death or
serious injury.
3.
Use a valve spring compressor to compress the
valve spring.
4.
Position the valve spring cap onto the valve stem
and release valve spring tension to lock cap in
place.
11-2
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Chapter 12
Oil Seal Service and Mounting Flange
NOTES
Oil Seal Service
1.
Drain oil from crankcase.
2.
If the crankshaft end is rusty or pitted, polish the
crankshaft with emery cloth so it will not damage
the bearings when the cover is removed.
3.
Remove mounting bolts and slide seal protectordriver tool (Part No. 670327A) into the oil seal.
NOTE
If crankshaft is out of engine, remove old oil seals by
tapping them out with a screwdriver or punch from the
inside.
To remove a seal with the crankshaft in the engine, insert
a screwdriver between the seal and the crankshaft and
pry the seal out.
Seal Replacement
If necessary, tap edge of flange or cover lightly with a
rubber mallet to remove cover.
1.
Lubricate the outside of the new oil seal with oil
prior to installation.
4.
2.
Use seal driver-protector tool (Part No. 670327A).
3.
Place oil seal over the driver-protector and place
over crankshaft, driving it into position using
universal driver (Part No. 670272). The seal will
automatically be driven into the proper depth.
Clean and inspect the cover for wear and scoring of
bearings.
5.
Inspect crankshaft bearings.
6.
Replace any worn or damaged parts.
The numerical order for gradually
removing and tightening screws
on the mounting flange is critical for proper
distribution of pressure. Failure to do so may
result in oil leaks and accelerated engine wear.
CAUTION
4.
Torque flange bolts in numerical order as shown in
illustration.
5.
See Torque Specifications Section.
Mounting Flange
3
5
7
Seal Protector Driver
1
2
6
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Chapter 13
Troubleshooting
The following charts can be helpful in locating the most common troubles associated with gasoline engines; Possible causes and remedies are listed below. Refer to the appropriate sections in this Technician's Handbook for
further detail of procedures.
Table 1. 4-Cycle Engine Troubleshooting Chart
Engine Fails to Start or Starts with Difficulty
Remedy and Reference
Cause
No fuel in tank.
Fill tank with clean, fresh fuel.
Shut-off valve closed.
Open valve.
Tank cap vent obstructed.
Clean the vent or replace the cap.
Obstructed fuel line.
Clean fuel screen and line. If necessary, remove and clean
carburetor.
Engine flooded.
Close fuel shut-off, if so equipped, and pull starter until engine
starts. Reopen fuel shut-off for normal fuel flow.
Water in fuel.
Drain tank. Clean carburetor and fuel lines. Dry spark plug
points. Fill tank with clean, fresh fuel.
Spark plug fouled.
Replace spark plug.
No spark at plug.
Check ignition air gap. If air gap is correct and there is no
spark at plug replace ignition.
Spark plug porcelain cracked.
Replace spark plug.
Electric starter does not crank engine.
See 12 volt starter troubleshooting chart.
Loose or defective ignition wiring.
Check ignition wiring for shorts or grounds; repair if necessary
Incorrect timing.
Flywheel key has sheared or partially sheared. Replace key.
Poor compression.
Overhaul engine.
Engine Knocks
Loose flywheel.
Check flywheel key and keyway; replace parts if necessary.
Tighten flywheel nut to proper torque.
Improper ignition timing.
Flywheel key has sheared or partially sheared. Replace
key.
Carbon in combustion chamber.
Remove cylinder head and clean carbon from head and
piston.
Loose or worn connecting rod.
Replace connecting rod.
Worn cylinder.
Replace cylinder.
13-1
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Table 1. 4-Cycle Engine Troubleshooting Chart (Continued)
Engine Misses Under Load
Remedy and Reference
Cause
Spark plug fouled.
Replace spark plug.
Improper spark plug gap.
Regap spark plug.
Spark plug porcelain cracked.
Replace spark plug.
Improper valve clearance.
Adjust valve clearance to recommended specifications.
Weak valve spring.
Replace valve spring.
Air cleaner fouled.
Service
air cleaner.
Engine
Lacks Power
Air cleaner fouled.
Service air cleaner.
Lack of lubrication.
Fill crankcase to the proper level.
Ignition improperly timed.
Replace flywheel key.
Valves leaking.
Grind valves and set to recommended specifications.
Worn rings.
Replace rings.
Engine Overheats
Cooling fins clogged.
Clean cooling fins.
Air flow obstructed.
Remove any obstructions from air passages in shrouds.
Fuel tank cap vent hole clogged.
Open vent hole.
Lack of lubrication.
Fill crankcase to proper level.
Excessive load on engine.
Check operation of associated equipment. Reduce excessive load.
Carbon in combustion chamber.
Remove cylinder head and clean carbon from head and piston.
Engine improperly timed.
Replace flywheel key if sheared.
Engine Surges or Runs Unevenly
Governor parts sticking or binding.
Clean, and if necessary repair governor parts.
Carburetor throttle linkage or throttle
Clean, lubricate, or adjust linkage and deburr throttle shaft or butterfly.
shaft and/or butterfly binding or sticking. Carburetor throttle linkage or throttle
Intermittent spark at spark plug.
Disconnect ignition cut-off wire at the engine. Crank engine. If spark,
check ignition switch, safety switch and interlock switch. If no spark,
check ignition air gap. Check wires for poor connections, cuts or breaks.
Governor not set properly.
Perform static governor setting.
Dirty carburetor.
Clean carburetor.
Valves not seated.
Clean carbon from valve, recut seats, check valve clearance.
Engine Vibrates Excessively
Engine not securely mounted.
Tighten loose mounting bolts.
Bent crankshaft.
Replace crankshaft.
Associated equipment out of balance.
Check associated equipment.
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Table 1. 4-Cycle Engine Troubleshooting Chart (Continued)
Engine Uses Excessive Amount of Oil
Remedy and Reference
Cause
Oil level too high.
To check level turn dipstick cap tightly into receptacle for
accurate level reading.
Oil filler cap loose or gasket damaged causing
spillage.
Replace ring gasket under cap and tighten tube securely.
Engine speed too fast.
Using tachometer adjust engine RPM to spec.
Gaskets damaged or gasket surfaces nicked
causing oil to leak out.
Clean and smooth gasket surfaces. Always use new
gaskets.
Breather tube not connected to air cleaner.
Reconnect tube.
Using 10W30 oil under high load/high temperature
conditions.
Replace with SAE 30 oil.
Breather mechanism damaged or dirty causing
leakage.
Replace breather assembly.
Drain hole in breather box clogged causing oil to
spill out of breather.
Clean hole with wire to allow oil to return to crankcase.
Oil passages obstructed.
Clean out all oil passages.
Piston oil control ring return holes clogged.
Remove oil control ring and clean return holes.
Piston rings and grooves worn excessively.
Reinstall new rings and check land clearance and correct
as necessary.
Cylinder wall worn or glazed, allowing oil to
bypass rings into combustion chamber.
Bore cylinder for oversized piston & rings.
Piston fit undersized.
Measure and replace as necessary.
Valve guides worn excessively thus passing oil
into combustion chamber.
Ream valve guide oversize and install 1/32'’ oversize valve
and new valve seal if equipped.
Oil Seal Leaks
Crankcase breather plugged.
Clean or replace breather.
Seal outside seat in cylinder or side cover is
damaged, allowing oil to seep around outer
edge of seal.
Visually check seal receptacle for nicks and damage.
Replace P.T.O. cylinder cover, or small cylinder cover on
the magneto end if necessary.
Old seal hardened and worn.
Crankshaft seal contact surface is worn undersize
causing seal to leak.
Replace seal.
Check crankshaft size and replace if worn excessively.
Crankshaft bearing under seal is worn excessively,
causing crankshaft to wobble in oil seal.
Check crankshaft bearings for wear and replace if
necessary.
13-3
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Table 1. 4-Cycle Engine Troubleshooting Chart (Continued)
Oil Seal Leaks (Continued)
Remedy and Reference
Cause
Bent crankshaft causing seal to leak.
Check crankshaft for straightness and replace if necessary.
New seal damaged upon installation.
Use proper seal protector tools and methods for installing
another new seal.
New seal installed without correct seal driver and
not seating squarely in cavity.
Replace with new seal, using proper tools and methods.
Oil seal driven too far into cavity.
Remove seal and replace with new seal, using the correct
driver tool and procedures.
Breather Passing Oil
Oil level too high.
Check oil level Turn dipstick cap tightly into receptacle for
accurate level reading. DO NOT fill above full mark.
Loose oil fill cap or gasket damaged or missing.
Install new ring gasket under cap and tighten securely.
Engine speed too fast.
Use tachometer to adjust correct RPM.
Cylinder cover gasket leaking.
Replace cover gasket.
Damaged or worn oil seals on end of crankshaft.
Replace seals.
Breather mechanism loose or gaskets leaking.
Install new gaskets and tighten securely.
Breather mechanism installed upside down.
Small oil drain holes must be down to drain oil from
mechanism.
Drain hole in breather box clogged.
Clean hole with wire to allow oil to return to crankcase.
Breather mechanism dirty.
Clean thoroughly in solvent. Use new gaskets when
reinstalling unit.
Breather mechanism damaged.
Replace umbrella valve/seat in Vector engine and TVS
engines.
Breather assembly not assembled correctly.
See section on Breather Assembly.
Rings not properly seated.
Check for worn, or out of round cylinder. Replace rings.
Break in new rings with engine working under a varying
load. Rings must be seated under high compression, or in
other words, under varied load conditions.
695578
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Table 2. Carburetor Malfunction Check Points
Corrections
Trouble
Engine will not start
1, 2, 3, 4, 5, 6, 8, 14, 15, 17, 18, 19
Engine will not accelerate
2, 3, 17
Engine hunts (at idle or high speed)
3, 4, 8, 9, 14, 20, 21, 22
Engine will not idle
4, 8, 9, 14, 20, 21, 22
Engine lacks power at high speed
2, 3, 6, 8, 17
Carburetor floods
4, 7, 16, 18
Carburetor leaks
6, 7, 18
Engine overspeeds
8, 9, 14, 15
Idle speed is excessive
8, 9, 14, 15
Engine starves for fuel at high speed (leans out)
1, 3, 4, 6, 15, 16, 17
Carburetor runs rich
7, 16, 18
Performance unsatisfactory after being serviced.
1, 2, 3, 4, 5, 6, 7, 8, 9, 15, 16, 17
1.
Open fuel-shut off valve at fuel tank—Fill tank with
fuel.
13. Check inlet needle and seat for condition and
proper installation.
2.
Check ignition, spark plug.
14. Check sealing of welch plugs, and gaskets.
3.
Clean air cleaner—Service as required.
15. Adjust governor linkage.
4.
Dirt or restriction in fuel system—Clean tank and
fuel strainers, check for kinks or sharp bends.
16. Check float shaft for wear and float for leaks or
dents.
5.
Check for stale fuel or water in fuel - - Fill with fresh
fuel.
17. Check flywheel key for damage.
6.
Examine fuel line and pick-up for sealing at fittings.
7.
Check and clean atmospheric vent holes in
carburetor and air cleaner body.
19. Check for warp air filter box causing prime charge
loss.
8.
Examine throttle for binding or excessive play- Remove all dirt or paint, replace shaft.
21. Air leak at intake cross over pipe, check using
spray carburetor cleaner.
9.
Examine throttle return spring for operation.
22. Air leak between the carburetor body and bowl.
Replace bowl assembly.
10. Check for bent throttle plate.
18. Shrunken primer bulb causing siphon affect.
20. Air leak at idle welch plug, reseal with nail polish.
11. Adjust control cable or linkage, to assure
carburetor control.
12. Clean carburetor after removing all nonmetallic
parts that are serviceable. Trace all passages.
13-5
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Table 3. Troubleshooting 12 Volt Starters
Problem
Does not function
Low RPM
695578
Probable Cause
Remedy and Reference
Weak or dead battery.
Check charge and/or replace battery.
Loose or faulty electrical connections.
Correct.
Corroded battery terminals and/or
electrical connections.
Load on engine.
Clean terminals and/or connections.
Disengage brake.
Electric starter cranks, but no spark
at spark plug.
Disconnect ignition cut-off wire at the engine.
Crank engine. If spark at spark plug, ignition
switch, safety switch is in operative. If no
spark, check air gap. Check wires for poor
connections, cuts or breaks.
Electric starter does not crank engine.
Remove starter wire. Use a jumper battery
and cables and attach directly to starter wire.
If starter cranks engine the starter is okay,
check solenoid, starter switches, safety
switches and interlock switch. Check wires
for poor connections, cuts or breaks.
Electric starter cranks, but engine
does not turn over.
Check flywheel ring gear for broken teeth.
Replace flywheel if necessary.
Brushes sticking.
Free brushes. Replace worn brushes and
those which have come in contact with grease
and oil.
Open or shorted armature.
Replace armature.
Shorted, open or grounded field coil.
Repair or replace housing.
Armature binding or bent.
Free armature and adjust end play, replace
armature, or replace starter.
Dirty or oily commutator.
Clean and dress commutator.
Incorrect engine oil.
Ensure the correct weight of oil is being used.
Unit controls engaged.
Insure all unit controls are in neutral or
disengaged.
Weak or annealed brush springs.
Replace springs.
Loose or faulty electrical connections
in motor.
Brushes not seated properly.
Correct.
Worn bearings in cap assemblies.
Clean bearings or replace cap assemblies.
Bent armature.
Replace armature.
Binding armature.
Free up armature. Adjust armature end
play.Binding armature. Free up armature.
Adjust armature end play.
Dirty armature commutator.
Clean commutator.
Shorted or open armature.
Replace armature.
Correct.
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Table 3. Troubleshooting 12 Volt Starters (Continued)
Problem
Probable Cause
Remedy and Reference
Motor stalls under load.
Shorted field coil.
Correct, or replace housing assembly.
Shorted or open armature.
Replace armature.
Break in electrical circuit.
Disconnect ignition cut-off wire at the engine.
Crank engine, if spark, check ignition switch,
safety switch and interlock switch. Check
wires for poor connections, cuts or breaks.
Loose or faulty electrical
connections.
Correct.
Dirty or oily commutator.
Clean and dress commutator.
Brushes binding in holders.
Free up brushes. Replace worn brushes and
those which have come in contact with
grease and oil.
Open armature.
Replace armature and interlock switch.
Dirt and oil on assembly and
armature shaft.
Clean drive assembly and armature shaft
and relubricate shaft splines.
Bent armature.
Replace armature.
Intermittent operation.
Sluggish disengagement
of the drive assembly
pinion gear.
13-7
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Chapter 14
Engine Specifications
VLV40
Displacement
11.19
VLV50, 55, 60, 65, 6.75
VLV126
183.4 cc
12.6
207 cc
Stroke
2.047
51.993 mm
2.047
51.993 mm
Bore
2.6390
2.6380
67.031 mm
2.796
2.795
71.018 mm
70.993 mm
Air Gap Dimension Ignition
.0125
.30 mm
.0125
.30 mm
Spark plug gap
.030
.70 mm
.030
.70 mm
Valve Clearance Intake and Exhaust
.004
.008
.101 mm
.203 mm
.004
.008
.101 mm
.203 mm
Valve Seat Angle
46o
46o
46o
46o
Valve Seat Width
.047
1.2 mm
.047
1.2mm
Valve Guide Oversize Dia.
.2807
.2817
7.129 mm
7.155 mm
.2807
.2817
7.129 mm
7.155 mm
Crankshaft End Play
.005
.027
.127 mm
.685 mm
.005
.027
.127 mm
.685 mm
Crankpin Journal Dia.
1.0235
1.0230
25.996 mm
25.984 mm
1.0235
1.0230
25.996 mm
25.984 mm
Crankshaft Magneto Main Brg. Dia
1.0242
1.0237
26.014 mm
26.001 mm
1.0242
1.0237
26.014 mm
26.001 mm
Crankshaft P.T.O. Main Brg. Dia
1.0242
1.0237
26.014 mm
26.001 mm
1.0242
1.0237
26.014 mm
26.001 mm
.4980
.4975
12.649 mm
12.636 mm
.4980
.4975
12.649 mm
12.636 mm
Conn. Rod Dia. Crank Brg.
1.0246
1.0240
26.024 mm
26.009 mm
1.0246
1.0240
26.024 mm
26.009 mm
Piston Diameter
2.6340
2.6330
66.903 mm
66.878 mm
2.6340
2.6330
66.903 mm
66.878 mm
Camshaft Bearing Dia.
Ring Groove Side Clearance 1st & 2nd Comp.
.002
.005
.050 mm
.127 mm
.002
.005
.050 mm
.127 mm
Side Clearance (Bot.) Oil
.0005
.0035
.012 mm
.088 mm
.0005
.0035
.012 mm
.088 mm
Piston Skirt Clearance measured 90o from pin
at the bottom of the skirt
.004
.006
.101 mm
.152 mm
.004
.006
.101 mm
.152 mm
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Torque Specifications
Inch-Lbs.
Nm
Governor Rod Clamp to Lever
7-12
1.4 - 1.4
Breather Cover
40-50
4.5 - 5.7
Valve Box Cover
25-35
3.1 - 4.0
Connecting Rod
95-110
10.7 - 12.4
Cylinder Head
180-220
20.3 - 25
Mounting Flange or Cylinder Cover
100-130
11.3 - 14.7
Housing Baffle to Cylinder
80-120
9.0 - 13.6
Solid State Ignition to Cylinder
30-50
3.4 - 5.7
Alternating Coil Assembly to Lamination
25-35
2.8 - 4.0
400-440
500-600
45.2 - 49.7
56.5 - 67.8
Housing to Baffle
35-45
4.0 - 5.1
Carburetor Stud to Cylinder
50-75
5.7 - 8.5
A/C Hex Nut to Stud
35-45
4.0 - 5.1
Control Face Plate to Baffle
20-35
2.3-3.9
Starter Top Mounting
20-30
2.3 - 3.4
Electric Starter to Baffle
25-35
2.8 - 3.9
5/8-18 Plug (Hex Flange) Drain plug
90-150
10.2 - 17.0
Plastic Tank to Housing
12-20
1.4 - 2.3
Threaded Fill Tube (Plastic)
45-65
4.0 - 7.3
Large Diameter Oil Fill Plug
Hand Tight
Flywheel Nut (Aluminum)
Flywheel Nut (Cast Iron)
Muffler Mounting (Shoulder Screw)
14-2
100-165
11.3 - 18.7
A/C Body & Housing to Baffle
35-45
4.0 - 5.1
Conduit Clip Screw (Throttle Cable)
5-15
.6 - 1.7
Muffler Deflector
10-15
1.1 - 1.7
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Chapter 15
Education Materials and Tools
Available Technician's Handbooks
692508
Covers the diagnosis and repair of Tecumseh 2-cycle
engines. Except the TC Engine and TVS840.
692509
Covers the diagnosis and repair of the Tecumseh
4-cycle light/medium frame engines.
691462A
Covers the diagnosis and repair of Tecumseh 4-cycle large
frame engines.
691218
Covers the diagnosis and repair of Peerless® power train
components.
694782
Contains technical information for the repair of the TC series,
2-cycle engines.
694988
Contains diagnosis and technical information for the repair
of TVS840, HSK/HXL845/850, 2-cycle engines.
695244A
Covers the diagnosis and repair of the OVRM/OVM/OHH/
OHM/OHV 4-cycle overhead valve engines.
695578
Covers the diagnosis and repair of the Vector Series,
4-cycle engines.
Video Programs
695015
Carburetor Troubleshooting. Covers identification of
carburetors used on Tecumseh engines and how to
troubleshoot and repair them. VHS only.
695148
Teardown and reassembly of the 900 series transaxles.
This video will show a complete step-by-step procedure
for teardown and reassembly of the 900, 910 and 920
series transaxles.
Specialty/Troubleshooting Booklets Instructional Guide
692738
Assists in the use and understanding of the Tecumseh
Master Parts Manual. Illustrates time saving features
incorporated into the manual. Explains new carburetor
parts breakdown format.
4-Cycle Engine Failure Analysis
695590
This booklet is designed as a tool for the average
technician to correctly assess the cause of failure.
Carburetor Troubleshooting Booklet
695907
This booklet is designed as a quick reference to carburetion
problems and related repair procedures.
Ignition Systems Troubleshooting Booklet
694903
This booklet contains information on the identification,
possible problems and related repair procedures of
Tecumseh Ignition Systems.
Tools Booklet
694862
This booklet depicts all specialty tools offered by Tecumseh
which can be used on 2 and 4 cycle engines and Peerless
units.
Quick Reference Chart Booklet
695933
This booklet contains the quick reference information
designed to be used as a work bench quick reference
guide when servicing Tecumseh engines and motion drive
systems.
Tester Booklets
695285
An in-depth look at the 800 series transaxles. Detailing
the teardown and reassembly procedures for the 800, 801
and 820 transaxles.
694529
Test procedures for Tecumseh electrical components using
Graham-Lee Tester 31-SM or 31-SMX-H.
694530
Test procedures for Tecumseh electrical components using
Merco-O-Tronic Tester 9800. (Tests are similar for 98, 98A
and 79.)
695578
15-1
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For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
Tool Kit 670195E
Kit contains tools for 2- and 4-cycle engines.
Includes all items on this page but items may be purchased separately.
670305
Strap Wrench
6702
6702
6702
6702
6702
64
63
67
6702
6702
6702
67
67
6702
67
6702
0266
60
61
62
6702
67
6703
6703
6703
68
670293
0269
36
37
14
6703
6703
29
08
10
27A
6703
6703
6703
6701
6701
65
670292
0309
6703
670294
74
72
0277
73
30
35
03
69
670306
Flywheel
Puller
670299
Flywheel Puller
670315A
Valve Spring Compressor
For: OVM, OVXL 120-125, OHV 11-17
670297
Air gap Gauge
.0125
15-2
670321
Air gap Gauge
.030
670324
670323
670334
www.mymowerparts.com
670333
670320
670324
695578
For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
FLYWHEEL KNOCK-OFF TOOL
No. 670169
TORX DRIVERS
Torx 8
670334
Torx 10
670333
Torx 15
670323
Torx 20
670324
Torx 25
670319
Torx 30
670320
VIBRATION TACHOMETER
No. 670156 - Vibration tachometer.
No. 670117 - Ring Expander
No. 670339 - E-5 Socket
No. 670283 - Valve Guide Reamer
695578
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15-3
For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
Chapter 16
Sears Craftsman Cross Reference Chart
143.434112
VLV55-501004
143.976608
VLV66-502511B
143.434252
VLV55-501008
143.976610
VLV66-502512B
143.945500
VLV55-501004A
143.976612
VLV66-502513D
143.956000
VLV60-502003A
143.986008
VLV60-502055D
143.956002
VLV60-502004A
143.986516
VLV65-502521C
143.956006
VLV60-502012A
143.986600
VLV66-502505C
143.966000
VLV60-502015B
143.986700
VLV66-502514C
143.966006
VLV60-502023B
143.986706
VLV66-502515C
143.966008
VLV60-502024B
143.986708
VLV66-502516C
143.966500
VLV65-502501A
143.986710
VLV66-502517C
143.966502
VLV65-502502A
143.986712
VLV66-502518C
143.966504
VLV65-502503A
143.986720
VLV66-502523C
143.966506
VLV65-502504A
143.996500
VLV126-502522D
143.966508
VLV65-502505A
143.996700
VLV126-502524D
143.975512
VLV55-501068C
143.996704
VLV126-502525D
143.975514
VLV55-501069C
143.996706
VLV126-502523D
143.976000
VLV60-502015C
143.996708
VLV126-502526D
143.976006
VLV60-502047C
143.996710
VLV126-502527D
143.976008
VLV60-502055C
143.996712
VLV126-502528D
143.976500
VLV65-502506B
143.006500
VLV126-502522E
143.976502
VLV65-502510B
143.006704
VLV126-502527E
143.976600
VLV66-502507B
143.006706
VLV126-502533E
143.976602
VLV66-502508B
143.006710
VLV126-502523E
143.976604
VLV66-502505B
143.016500
VLV126-502534E
143.976604
VLV66-502509B
16-1
www.mymowerparts.com
695578
For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
Decimal/Fraction Conversions
.016
.031
.047
.063
.078
.094
.109
.125
.141
.156
.172
.188
.203
.219
.234
.25
.266
.281
.297
.312
.328
.344
.359
.375
.391
.406
.422
.438
.453
.469
.484
.50
695578
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
1/64
1/32
3/64
1/16
5/64
3/32
7/64
1/8
9/64
5/32
11/64
3/16
13/64
7/32
15/64
1/4
17/64
9/32
19/64
5/16
21/64
11/32
23/64
3/8
25/64
13/32
27/64
7/16
29/64
15/32
31/64
1/2
.516
.531
.547
.563
.578
.594
.609
.625
.641
.656
.672
.688
.703
.719
.734
.75
.766
.781
.797
.813
.828
.844
.859
.875
.891
.906
.922
.938
.953
.969
.984
=
=
=
=
=
=
=
=
=
=
=
=
=
=
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33/64
17/32
35/64
9/16
37/64
19/32
39/64
5/8
41/64
21/32
43/64
11/16
45/64
23/32
47/64
3/4
49/64
25/32
51/64
13/16
53/64
27/32
55/64
7/8
57/64
29/32
59/64
15/16
61/64
31/32
63/64
16-2
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For Discount Tecumseh Engine Parts Call 606-678-9623 or 606-561-4983
NOTES
16-3
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695578