BY
series
OPERATION MANUAL
4BY2
6BY2
P/N: 0ABY0-G00200
MARINE
ENGINES
Disclaimers:
All information, illustrations and specifications in this manual are based on the latest
information available at the time of publishing. The illustrations used in this manual are
intended as representative reference views only. Moreover, because of our continuous
product improvement policy, we may modify information, illustrations and / or specifications
to explain and / or exemplify a product, service or maintenance improvement. We reserve
are
the right to make any change at any time without notice. Yanmar and
registered trademarks of Yanmar Co., Ltd. in Japan, the United States and / or other
countries.
All Rights Reserved:
No part of this publication may be reproduced or used in any form by any means - graphic,
electronic, or mechanical, including photocopying, recording, taping, or information storage
and retrieval systems - without the written permission of Yanmar Marine International.
© 2008 Yanmar Marine International
1108
ii
BY Series Operation Manual
© 2008 Yanmar Marine International
TABLE OF
CONTENTS
Page
Introduction......................................................................1
Record of Ownership......................................................2
Safety...............................................................................3
Safety Precautions.........................................................4
General Information ................................................. 4
Before You Operate ................................................. 4
During Operation and Maintenance ............................. 4
Safety Decals................................................................8
Product Overview..............................................................9
Yanmar BY-Series Features and Applications......................9
New Engine Break In.............................................. 10
Component Identification...............................................11
Left Side (as viewed from flywheel) - 4BY2 .................. 11
Right Side (as viewed from flywheel) - 4BY2 ................ 11
Top View - 4BY2 ................................................... 12
Left Side - 6BY2 .................................................... 12
Right Side - 6BY2 .................................................. 13
Top View - 6BY2 ................................................... 13
Location of Nameplates.................................................14
Function of Major Components........................................16
Fuses and Relays.........................................................18
Engine Cover..............................................................19
Before You Operate..........................................................21
Diesel Fuel..................................................................22
Diesel Fuel Specifications ....................................... 22
Filling the Fuel Tank ............................................... 24
Bleeding the Fuel System........................................ 24
Engine Oil...................................................................25
Engine Oil Specifications......................................... 25
Acceptable Engine Oil ............................................ 26
Checking Engine Oil............................................... 29
BY Series Operation Manual
© 2008 Yanmar Marine International
iii
TABLE OF CONTENTS
Adding Engine Oil.................................................. 29
Marine Gear or Stern Drive Oil.........................................30
Power Steering Fluid Specifications..................................30
Checking Power Steering Fluid Level ......................... 30
Engine Coolant............................................................31
Acceptable Engine Coolant...................................... 31
Engine Operation.............................................................33
Starting the Engine.......................................................34
Starting at Low Temperatures .................................. 35
Shutting Down the Engine..............................................35
Emergency Shut Down ........................................... 35
Checking the Engine After Operation................................36
Periodic Maintenance.......................................................37
Safety Precautions.......................................................37
Precautions.................................................................39
The Importance of Periodic Maintenance .................... 39
Performing Periodic Maintenance ............................. 39
The Importance of Daily Checks ............................... 39
Keep a Log of Engine Hours and Daily Checks............. 39
Yanmar Replacement Parts ..................................... 39
Tools Required ..................................................... 39
Ask Your Authorized Yanmar Marine Dealer or
Distributor For Help................................................ 39
Required EPA Maintenance ..................................... 39
EPA Requirements.......................................................40
Conditions to Ensure Compliance with EPA Emission
Standards ............................................................ 40
Inspection and Maintenance .................................... 40
Tightening Fasteners.............................................. 40
Periodic Maintenance Schedule......................................42
Inspection and Maintenance of EPA Emission-Related
Parts................................................................... 46
Daily Checks...............................................................46
Visual Checks....................................................... 46
Checking Diesel Fuel, Engine Oil and Engine Coolant
Levels ................................................................. 47
Checking the Battery Electrolyte Level ....................... 47
Checking the Alarm Indicators .................................. 47
Preparing Fuel, Oil and Coolant in Reserve ................. 47
Checking Power Steering Fluid................................. 47
Draining the Fuel / Water Separator ........................... 47
Periodic Maintenance Procedures....................................48
After Initial 50 Hours of Operation.............................. 48
Every 50 Hours of Operation .................................... 49
Every 250 Hours of Operation .................................. 50
Every 500 Hours of Operation .................................. 55
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BY Series Operation Manual
© 2008 Yanmar Marine International
TABLE OF CONTENTS
Every 1000 Hours of Operation................................. 56
Every 2000 Hours of Operation................................. 57
Troubleshooting..............................................................59
Troubleshooting Information........................................... 59
Troubleshooting Chart...................................................60
Starting Trouble .................................................... 60
Exhaust Color ....................................................... 61
Vibration - Drive Disengaged.................................... 61
Vibration - Drive Engaged........................................ 62
Engine Knocks...................................................... 62
Low Power Output ................................................. 62
Engine Overheat ................................................... 63
Engine Runs Cold.................................................. 63
Coolant Loss ........................................................ 63
Diagnostic Trouble Codes..............................................64
Diagnostic Trouble Code Table ................................ 65
Long-Term Storage..........................................................69
Prepare Engine for Long-Term Storage.............................69
Draining the Seawater Cooling System....................... 70
Specifications..................................................................71
Engine Specifications....................................................71
EPA Warranty USA Only....................................................75
Yanmar Co., Ltd. Limited Emission Control System Warranty
- USA Only..................................................................75
Your Warranty Rights and Obligations: ....................... 75
Warranty Period: ................................................... 76
Warranty Coverage: ............................................... 76
Exclusions: .......................................................... 76
Owner’s Responsibility: .......................................... 76
Customer Assistance: ............................................ 77
Maintenance Log................................................... 78
BY Series Operation Manual
© 2008 Yanmar Marine International
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TABLE OF CONTENTS
This Page Intentionally Left Blank
vi
BY Series Operation Manual
© 2008 Yanmar Marine International
INTRODUCTION
Welcome to the world of Yanmar Marine!
Yanmar Marine offers engines, drive
systems and accessories for all types of
boats, from runabouts to sailboats, and from
cruisers to mega yachts. In marine leisure
boating, the worldwide reputation of Yanmar
Marine is second to none. We design our
engines to respect nature. This means
quieter engines, with minimal vibrations,
cleaner than ever. All of our engines
designed after 1996 meet most of the
present and future emission regulations,
such as BSO II, SAV, EPA II, IMO and RCD.
To help you enjoy your Yanmar BY2 engine
for many years to come, please follow these
recommendations:
• Read and understand this Operation
Manual before you operate the machine to
ensure that you follow safe operating
practices and maintenance procedures.
• Keep this Operation Manual in a
convenient place for easy access.
• If this Operation Manual is lost or
damaged, order a new one from your
authorized Yanmar marine dealer or
distributor.
• Make sure this manual is transferred to
subsequent owners. This manual should
be considered a permanent part of the
engine and remain with it.
• Constant efforts are made to improve the
quality and performance of Yanmar
products, so some details included in this
Operation Manual may differ slightly from
your engine. If you have any questions
about these differences, please contact
your authorized Yanmar marine dealer or
distributor.
• The specifications and components
(instrument panel, fuel tank, etc.)
described in this manual may differ from
ones installed on your vessel. Please refer
to the manual provided by the
manufacturer of these components.
• Refer to the Yanmar Limited Warranty
Handbook for a complete warranty
description.
BY Series Operation Manual
© 2008 Yanmar Marine International
1
INTRODUCTION
RECORD OF OWNERSHIP
Take a few moments to record the information you need when you contact Yanmar for
service, parts or literature.
Engine Model:
Engine Serial No.:
Date Purchased:
Dealer:
Dealer Phone:
2
BY Series Operation Manual
© 2008 Yanmar Marine International
SAFETY
Yanmar considers safety of great
importance and recommends that anyone
that comes into close contact with its
products, such as those that install, operate,
maintain or service Yanmar products,
exercise care, common sense and comply
with the safety information in this manual
and on the machine’s safety labels. Keep
the labels from becoming dirty or torn and
replace them if they are lost or damaged.
Also, if you need to replace a part that has a
label attached to it, make sure you order the
new part and label at the same time.
!
This safety alert symbol appears
with most safety statements. It
means attention, become alert,
your safety is involved! Please
read and abide by the message
that follows the safety alert
symbol.
DANGER
Indicates an hazardous situation which, if
not avoided, will result in death or serious
injury.
WARNING
Indicates a hazardous situation which, if not
avoided, could result in death or serious
injury.
CAUTION
Indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
NOTICE
Indicates a situation which can cause
damage to the engine, personal property
and / or the environment or cause the
equipment to operate improperly.
BY Series Operation Manual
© 2008 Yanmar Marine International
3
SAFETY
SAFETY PRECAUTIONS
General Information
There is no substitute for common sense
and careful practices. Improper practices or
carelessness can cause burns, cuts,
mutilation, asphyxiation, other bodily injury
or death. This information contains general
safety precautions and guidelines that must
be followed to reduce risk to personal safety.
Special safety precautions are listed in
specific procedures. Read and understand
all of the safety precautions before operation
or performing repairs or maintenance.
During Operation and
Maintenance
DANGER
The safety message that follows has
DANGER level hazards.
Crush Hazard
NEVER stand under hoisted
engine. If the hoist
mechanism fails, the engine
will fall on you.
Before You Operate
DANGER
The safety message that follows has
DANGER level hazards.
NEVER permit anyone to install or
operate the engine without proper
training.
• Read and understand this Operation
Manual before you operate or service the
engine to ensure that you follow safe
operating practices and maintenance
procedures.
• Safety signs and labels are additional
reminders for safe operating and
maintenance techniques.
• See your authorized Yanmar Marine
dealer or distributor for additional training.
4
BY Series Operation Manual
© 2008 Yanmar Marine International
SAFETY
Sever Hazard
WARNING
The safety messages that follow have
WARNING level hazards.
Explosion Hazard
While the engine is running or
the battery is charging,
hydrogen gas is being
produced and can be easily
ignited. Keep the area around
the battery well-ventilated and keep sparks,
open flames and any other form of ignition
out of the area.
Rotating parts can cause
severe injury or death.
NEVER wear jewelry,
unbuttoned cuffs, ties or loose
fitting clothing and ALWAYS
tie long hair back when working near
moving / rotating parts such as the flywheel
or PTO shaft. Keep hands, feet and tools
away from all moving parts.
Alcohol and Drug Hazard
NEVER operate the engine
while under the influence of
alcohol or drugs or feeling ill.
Fire and Explosion Hazard
Diesel fuel is flammable and explosive
under certain conditions.
NEVER use a shop rag to catch the fuel.
Wipe up all spills immediately.
NEVER refuel with the engine running.
NEVER use diesel fuel as a cleaning agent.
Store any containers containing fuel in a
well-ventilated area, away from any
combustibles or sources of ignition.
Fire Hazard
Undersized wiring systems
can cause an electrical fire.
Store any containers containing fuel or other
flammable products in a well-ventilated
area, away from any combustibles or source
of ignition.
Exposure Hazard
ALWAYS wear personal
protective equipment
including appropriate
clothing, gloves, work shoes,
eye and hearing protection as
required by the task at hand.
Entanglement Hazard
NEVER leave the key in the
key switch when you are
servicing the engine.
Someone may accidentally
start the engine and not
realize you are servicing it.
NEVER operate the engine while wearing a
headset to listen to music or radio because
it will be difficult to hear the warning signals.
Store any equipment in a designated area
away from moving parts.
NEVER use the engine compartment for
storage.
BY Series Operation Manual
© 2008 Yanmar Marine International
5
SAFETY
CAUTION
WARNING
Piercing Hazard
Avoid skin contact with highpressure diesel fuel spray
caused by a fuel system leak
such as a broken fuel injection
line. High-pressure fuel can
penetrate your skin and result in serious
injury. If you are exposed to high-pressure
fuel spray, obtain prompt medical treatment.
NEVER check for a fuel leak with your
hands. ALWAYS use a piece of wood or
cardboard. Have your authorized Yanmar
Marine dealer or distributor repair the
damage.
Burn Hazard
Some of the engine surfaces
become very hot during
operation and shortly after
shutdown. Keep hands and
other body parts away from
hot engine surfaces.
Sudden Movement Hazard
ALWAYS stop the engine before beginning
service.
Exhaust Hazard
The safety messages that follow have
CAUTION level hazards.
Poor Lighting Hazard
Ensure that the work area is adequately
illuminated. ALWAYS install wire cages on
portable safety lamps.
Tool Hazard
ALWAYS use tools appropriate for the task
at hand and use the correct size tool for
loosening or tightening machine parts.
Flying Object Hazard
ALWAYS wear eye protection when
servicing the engine or when using
compressed air or high-pressure water.
Dust, flying debris, compressed air,
pressurized water or steam may injure your
eyes.
Coolant Hazard
Wear eye protection and
rubber gloves when you
handle Long Life engine
coolant. If contact with the
eyes or skin should occur,
flush eyes and wash immediately with clean
water.
NEVER block windows, vents
or other means of ventilation if
the engine is operating in an
enclosed area. All internal
combustion engines create
carbon monoxide gas during operation and
special precautions are required to avoid
carbon monoxide poisoning.
6
BY Series Operation Manual
© 2008 Yanmar Marine International
SAFETY
NOTICE
The safety messages that follow have
NOTICE level hazards.
It is important to perform daily checks as
listed in the Operation Manual. Periodic
maintenance prevents unexpected
downtime, reduces the number of accidents
due to poor engine performance and helps
extend the life of the engine.
See your authorized Yanmar Marine dealer
or distributor if you need to operate the
engine at high altitudes. At high altitudes the
engine will lose power, run rough and
produce exhaust gases that exceed the
design specifications.
ALWAYS be environmentally
responsible.
Follow the guidelines of the
EPA or other governmental
agencies for the proper
disposal of hazardous materials such as
engine oil, diesel fuel and engine coolant.
Consult the local authorities or reclamation
facility.
NEVER dispose of hazardous materials by
dumping them into a sewer, on the ground
or into ground water or waterways.
If a Yanmar Marine engine is installed at an
angle that exceeds the specifications stated
in the Yanmar Marine installation manuals,
engine oil may enter the combustion
chamber, causing excessive engine speed,
white exhaust smoke and serious engine
damage. This applies to engines that run
continuously or those that run for short
periods of time.
If you have an installation with two or three
engines and only one engine is operating,
the water pickup (thru-hull) of the nonrunning engine(s) should be closed. This will
prevent water from being forced past the
seawater pump and eventually finding its
way into the engine. The result of water
entering the engine could cause seizure or
other serious problems.
If you have an installation with two or three
engines, and only one engine is operating,
please note that if the propeller shaft thruhull (stuffing box) is lubricated by engine
water pressure and the engines are
interconnected, care must be taken that
water from the running engine does not
enter the exhaust of the non-running
engine(s). This water could cause seizure of
the non-running engine(s). See your
authorized Yanmar Marine dealer or
distributor for a complete explanation of this
condition.
If you have an installation with two or three
engines, and only one engine is operating,
it is important to limit the amount of throttle
applied to the running engine. If you observe
black smoke or movement of the throttle
does not increase engine rpm, you are
overloading the engine that is running.
Immediately throttle back to approximately
2/3 throttle or to a setting where the engine
performs normally. Failure to do so may
cause the running engine to overheat or
cause excess carbon buildup which may
shorten the engine’s life.
BY Series Operation Manual
© 2008 Yanmar Marine International
7
SAFETY
SAFETY DECALS
(2)
(1)
(1)
• Never remove
the cap while the
engine is still hot.
• Hot water may spurt
out and burn you.
60˚
(3)
120650-07040
60˚
0.5 ton
• NEVER pour the
engine oil across
FULL the full line.
0.5 ton
LOW
When lifting the
engine, lift only
as shown in
diagram.
120650-07050
When lifting the
engine, lift only
as shown in
diagram.
Weight: 0.5 ton
120650-07030
Weight: 0.5 ton
120650-07030
(6)
(4)
(7)
ATTENTION
(9)
Before filling with
cooling water, close
the drain cock.
The drain cock is open
during shipment.
Replacement items
After 250 hrs
or 1 year
(5)
Lube oil
Lube oil filter element
Fuel filter element
Pre fuel filter element
Anitcorrosion zinc
Air filter (please refer to operation manual for details)
120650-07070
(8)
1
2
3
4
5
8
–
–
–
–
–
120650-07030
120650-07040
120650-07050
120650-07060
120650-07070
Figure 1
0006620
6
7
8
9
–
–
–
–
120650-07080
120650-07090
120650-07100
120650-07121
BY Series Operation Manual
© 2008 Yanmar Marine International
PRODUCT OVERVIEW
YANMAR BY-SERIES
FEATURES AND
APPLICATIONS
The BY-series engines are in-line 4- and
6-cylinder direct injection diesel engines.
The engines are turbocharged and
equipped with a liquid cooling system.
These engines are designed for pleasure
craft use.
In order to obtain full performance from your
engine, it is imperative that you check the
size and structure of the hull and use a
propeller of the appropriate size. As new
boats are used, owners add additional
equipment and completely fill the fuel and
water tanks adding to the overall
displacement (weight) of the vessel. Extra
canvas enclosures, bottom paint, and
bottom fouling can add additional hull
resistance. It is recommended that a new
vessel be propped so the engine can
operate at 100 rpm above maximum rpm to
allow for some added weight and hull
resistance. Failure to do so can lead to
reduced vessel performance, increased
smoke levels and cause permanent
damage to your engine.
The engine must be installed correctly with
the seawater or cooling water piping,
exhaust gas piping and electrical wiring. Any
auxiliary equipment attached to the engine
should be easy to use and accessible for
service. To handle the drive equipment,
propulsion systems (including the propeller)
and other on-board equipment, be sure to
observe the instructions and cautions given
in the operation manuals supplied by the
shipyard and equipment manufacturers.
The laws of some countries may require hull
and engine inspections, depending on the
use, size and cruising area of the boat. The
installation, fitting and surveying of this
engine all require specialized knowledge
and engineering skills. See Yanmar's local
subsidiary in your region or your authorized
Yanmar marine dealer or distributor.
This engine is designed for pleasure boat
applications. The engine is designed to be
operated at: maximum throttle for less than
5% of its total operation time (30 minutes out
of every 10 hours). The engine should be
operated at cruising speed (3200 - 3300
rpm) for less than 90% of its total operation
time (9 hours out of every 10 hours).
BY Series Operation Manual
© 2008 Yanmar Marine International
9
PRODUCT OVERVIEW
New Engine Break In
• On the initial engine start-up, check for
proper engine oil pressure, diesel fuel
leaks, engine oil leaks, coolant leaks, and
for proper operation of the indicators and /
or gauges.
• During the first 50 hours of operation,
operate your new engine under a
substantial load at all times. For best
break-in results, operate the engine at
various speeds.
• During the first 50 hours of operation, try to
reduce unnecessary idling in Neutral.
• During the break-in period, carefully
observe the engine oil pressure and
engine temperature.
• During the break-in period, check the
engine oil and coolant levels frequently.
10
BY Series Operation Manual
© 2008 Yanmar Marine International
PRODUCT OVERVIEW
COMPONENT IDENTIFICATION
Figure 1, Figure 2 and Figure 3 illustrate a
typical version of a 4BY2 engine. Your
engine may have different equipment from
that illustrated.
Right Side (as viewed from
flywheel) - 4BY2
(3)
(4) (5)
Left Side (as viewed from
flywheel) - 4BY2
(1)
(2)
(1)
(6)
(7)
(2)
(9)
(8)
0006559
(3)
0006557
Figure 1
1 – Engine Oil Dipstick
2 – E-Box Panel
3 – High Pressure Fuel Pump
1
2
3
4
5
6
7
8
9
–
–
–
–
–
–
–
–
–
Figure 2
Zinc Anode
Zinc Anode
Exhaust / Water Mixing Elbow
Coolant Drain Cock
Heat Exchanger
Seawater Pump
Seawater Drain Cock
Hydraulic Oil Cooler
Coolant Drain Plug
BY Series Operation Manual
© 2008 Yanmar Marine International
11
PRODUCT OVERVIEW
Top View - 4BY2
(2)
(3)
(4)
(1)
Figure 4, Figure 5 and Figure 6 illustrate a
typical version of a 6BY2 engine. Your
engine may have different equipment from
that illustrated.
Left Side - 6BY2
(1)
(7)
(5)
(6)
0006560
Figure 3
Fuel Fine Filter
Intake Air Manifold
Engine Oil Filter
Power Steering Filler Port (if
equipped)
5 – Engine Oil Filler Port
6 – Coolant Filler Port
7 – Air Filter
1
2
3
4
–
–
–
–
(2)
(3)
0006558
Figure 4
1 – Engine Oil Dipstick
2 – E-Box Panel
3 – High Pressure Fuel Pump
Note: Yanmar supplies a water-separating
pre-filter for mounting by the installer. The
engine is equipped with an on-engine fine
filter (Figure 3, (1)).
12
BY Series Operation Manual
© 2008 Yanmar Marine International
PRODUCT OVERVIEW
Right Side - 6BY2
(3)
Top View - 6BY2
(2)
(4) (5)
(3)
(4)
(1)
(2)
(7)
(5)
(6)
(1)
(9)
1
2
3
4
5
6
7
8
9
–
–
–
–
–
–
–
–
–
(7)
(8)
0006561
Figure 5
Zinc Anode
Zinc Anode
Exhaust / Water Mixing Elbow
Coolant Drain Cock
Heat Exchanger
Seawater Pump
Seawater Drain Cock
Hydraulic Oil Cooler
Coolant Drain Plug
(6)
0006562
Figure 6
Fuel Fine Filter
Intake Air Manifold
Engine Oil Filter
Power Steering Filler Port (if
equipped)
5 – Engine Oil Filler Port
6 – Coolant Filler Port
7 – Air Filter
1
2
3
4
–
–
–
–
Note: Yanmar supplies a water-separating
pre-filter for mounting by the installer. The
engine is equipped with an on-engine fine
filter (Figure 6, (1)).
BY Series Operation Manual
© 2008 Yanmar Marine International
13
PRODUCT OVERVIEW
LOCATION OF
NAMEPLATES
6BY2
The engine data and drive information
nameplates on Yanmar BY2 series engines
are shown in Figure 7, Figure 8 and
Figure 9. Replace if damaged or lost.
Model
Gear Model
Continuous power kW
Fuel stop power kW
The typical location of the engine name plate
is shown for Yanmar 4BY2 Series marine
engines (Figure 7) and 6BY2 engines
(Figure 8).
4BY2
min-1
/
min-1
Speed of prop shaft
/
min-1
ENG.No.
Model
Gear Model
Continuous power kW
Fuel stop power kW
0006631
min-1
/
min-1
Speed of prop shaft
/
Figure 8
The engine block information is etched into
the cylinder block behind the engine oil
cooler near the end of the starting motor
(Figure 9).
min-1
ENG.No.
0006563
Figure 7
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BY Series Operation Manual
© 2008 Yanmar Marine International
PRODUCT OVERVIEW
MERCRUISER
DIVISION OF MERCURY MARINE
STILLWATER, OK, U.S.A.
SERIAL NUMBERS
ENGINE
TRANSOM
DRIVE
MODEL:
TRANSOM ASSEMBLY
AND STERN DRIVE
SERIAL NUMBER DECAL
STRIPS TO THE
RESPECTIVE BLANK
ON THIS DECAL.
4 BY
N
1085
N 075
1100 7 824 951
0006567
Figure 9
BY Series Operation Manual
© 2008 Yanmar Marine International
15
PRODUCT OVERVIEW
FUNCTION OF MAJOR COMPONENTS
Name of Component
Function
Fuel Filter / Water Separator (not supplied by
Yanmar)
Removes dirt and water from the fuel. The filter element should be replaced periodically. See Replacing Fuel Filter / Water Separator Element on page 52.
The water separator should be drained periodically. See Draining the Fuel / Water Separator on page 47.
Fuel Fine Filter
Removes extremely fine contaminants from fuel prior to entering fuel injection
system.
Fuel Feed Pump
Pumps fuel from the tank to the fuel injection system.
Engine Oil Fill Port
To add engine oil.
Engine Oil Filter
Filters fine metal fragments and carbon from the engine oil. Filtered engine oil is
distributed to the engine's moving parts. The filter is a cartridge type and the
element should be replaced periodically. See Changing the Engine Oil and Replacing the Engine Oil Filter on page 48.
Coolant System
There are two cooling systems: 1) closed cooling with coolant and 2) seawater.
The engine is cooled by the closed cooling system. The closed system coolant
is cooled by seawater using a heat exchanger. The seawater also cools the marine gear or power steering oil, and the combustion intake air through cooler(s)
in an open circuit.
Closed Cooling Circulation Pump
The centrifugal coolant pump circulates coolant inside the engine. The circulating
pump is driven by a poly V-belt.
Seawater Pump
Pumps seawater from outside vessel to the engine. The seawater pump is beltdriven and has a replaceable rubber impeller. Avoid impeller damage, do not
operate it without seawater.
Coolant Fill Cap
When the coolant temperature rises, the pressure inside the heat exchanger
increases, causing the pressure valve in the filler cap to open, forcing hot water
and steam through a rubber hose to the coolant recovery tank. When the engine
becomes cool and the pressure inside the coolant recovery tank drops, the vacuum valve in the filler cap opens and the coolant in the coolant recovery tank
returns to the heat exchanger through the hose and filler cap. This minimizes
coolant consumption.
Coolant Recovery Tank
The coolant fill cap valve releases vapor and hot water overflow to the coolant
recovery tank. When the engine stops and the coolant cools, the pressure in the
heat exchanger drops. The fill cap valve then opens to send coolant back from
the coolant recovery tank. This minimizes coolant consumption. The closed
cooling system coolant level can easily be checked and refilled in this tank.
Oil Cooler - Engine
A heat exchanger that cools high temperature engine oil using engine coolant.
Oil Cooler - Hydraulic
A heat exchanger that cools the marine gear oil or power steering fluid using
seawater.
Turbocharger
The turbocharger pressurizes the air coming into the engine. It is powered by a
turbine that is driven by exhaust gases.
Air Filter
The air filter removes dirt from the intake combustion air reducing engine wear.
Nameplates
Nameplates are provided on the engine and the marine gear and have the model,
serial number and other data.
16
BY Series Operation Manual
© 2008 Yanmar Marine International
PRODUCT OVERVIEW
Name of Component
Function
Electrical Panel (E-Box)
The electrical panel houses the engine electrical system fuses, relays, and ECU.
The ECU monitors data from the various sensors and controls such functions as
low-pressure fuel pump operation, fuel injection pressure, fuel injection system
volume, and the timing and volume of fuel injected by the Bosch electronic fuel
injectors. Throttle control is fly-by-wire meaning it is controlled by electric signals
from the helm. The throttle control is either analog or digital depending on the
level of control options installed. The ECU also uses sensor inputs to monitor
engine condition and will set a trouble code if a system or sensor indicates a
problem. In most cases, a Check Engine light will be displayed. The engine may
or may not run normally depending on the fault. Not all inputs are monitored by
the ECU. Low oil pressure and water in fuel are two examples. Either of these
conditions will result in a warning indicator and possible audible alarm. Low oil
pressure will also be indicated by the oil gauge at the helm (not available with
Classic Controls).
Electrical Panel (E-Box)
Circuit Breaker
The electrical panel circuit breaker is installed in the positive (+) cable of the
electrical panel power lead, and provides overload protection for the electrical
panel. The electrical panel power leads must be connected directly to the battery,
and must have a breaker installed in the B+ (red) lead.
BY Series Operation Manual
© 2008 Yanmar Marine International
17
PRODUCT OVERVIEW
FUSES AND RELAYS
(13)
(2) (4)
(6) (8)
(3)
(10)
(5) (7)
(9)
(11)
(14)
(12)
(1)
To access the fuse and relay panel, remove
the four bolts from the E-Box cover and
remove cover.
NOTICE: The electrical panel cables must
be connected directly to the battery, and
must have a circuit breaker installed in the B
+ (red) lead.
(15)
0004043
Figure 10
1 – Fuse F1 (3 A) - CAN Switched
Power
2 – Fuse F2 (10 A) - Ignition*
3 – Fuse F3 (15 A) - Fuel Supply
Pump
4 – Fuse F4 (30 A) - ECU Switched
Power
5 – Fuse F5 (20 A) - Power to Sensors
and Actuators
6 – Fuse F6 (10 A) - Auxiliary Power
7 – Jumper Fuse F7 (3 A) - Single /
Port Selection, default is single /
port (fuse in). Remove fuse for
starboard configuration.
8 – Jumper Fuse F8 (3 A) - CAN /
Analog Throttle Selection,
default is analog (fuse out).
Insert 3 A fuse to configure for
CAN.
9 – K1 - Starter Relay
10–K3 - Fuel Supply Pump Relay
11–K2 - Main Power Relay
12–ECU
13–Connector X1 - Communication
to Helm Display
14–Connector X21/1 - Engine Wiring
Harness
15–Connector X22/1 - Fuel Injector
Wiring Harness
*
18
NEVER connect any additional devices to F2. F6 may be used however, it is not switched.
BY Series Operation Manual
© 2008 Yanmar Marine International
PRODUCT OVERVIEW
ENGINE COVER
0006552
Figure 11
To remove the cover from the engine,
remove all bolts, then lift cover from engine.
BY Series Operation Manual
© 2008 Yanmar Marine International
19
PRODUCT OVERVIEW
This Page Intentionally Left Blank
20
BY Series Operation Manual
© 2008 Yanmar Marine International
BEFORE YOU OPERATE
This section of the Operation Manual
describes the diesel fuel, engine oil, and
engine coolant specifications and how to
replenish them. It also describes the daily
engine checkout.
BY Series Operation Manual
© 2008 Yanmar Marine International
21
BEFORE YOU OPERATE
DIESEL FUEL
Diesel Fuel Specifications
NOTICE: Only use diesel fuels
recommended by Yanmar for the best
engine performance, to prevent engine
damage and to comply with EPA warranty
requirements. Only use clean diesel fuel.
Diesel fuel should comply with the following
specifications. The table lists several
specifications for diesel fuels.
DIESEL FUEL
SPECIFICATION
LOCATION
No. 2-D, No. 1-D, ASTM
D975-94
USA
EN590:96
European Union
Bio-Diesel Fuels
Yanmar approves the use of bio-diesel fuels
that do not exceed a blend of 5% nonmineral oil based fuel with 95% standard
diesel fuel. Such bio-diesel fuels are known
in the marketplace as B5 bio-diesel fuels. B5
bio-diesel fuel can reduce particulate matter
and the emission of “greenhouse” gases
compared to standard diesel fuel.
NOTICE: If the B5 bio-diesel fuel used does
not meet the approved specifications, it will
cause abnormal wear of injectors, reduce
the life of the engine and it may affect the
warranty coverage of your engine.
B5 diesel fuels must meet certain
specifications
The bio-diesel fuels must meet the minimum
specifications for the country in which they
are used:
Precautions and concerns regarding
the use of bio-fuels:
• Bio-diesel fuels have a higher content of
methyl-esters, which may deteriorate
certain metal, rubber and plastic
components of the fuel system. The
customer and / or boat builder are
responsible to verify the usage of biodiesel compatible components on the
vessel fuel supply and return systems.
• Free water in bio-diesel may result in
plugging of fuel filters and increased
bacterial growth.
• High viscosity at low temperatures may
result in fuel delivery problems, injection
pump seizures, and poor injection nozzle
spray atomization.
• Bio-diesel may have adverse effects on
some elastomers (seal materials) and may
result in fuel leakage and dilution of the
engine lubricating oil.
• Even bio-diesel fuels that comply with a
suitable standard as delivered, will require
additional care and attention to maintain
the quality of the fuel in the equipment or
other fuel tanks. It is important to maintain
a supply of clean, fresh fuel. Regular
flushing of the fuel system, and / or fuel
storage containers, may be necessary.
• The use of bio-diesel fuels that do not
comply with the standards as agreed to by
the diesel engine manufacturers and the
diesel fuel injection equipment
manufacturers, or bio-diesel fuels that
have degraded as per the precautions and
concerns above, may affect the warranty
coverage of your engine.
• In Europe, bio-diesel fuels must comply
with the European Standard EN14214.
• In the United States, bio-diesel fuels must
comply with the American Standard ASTM
D-6751.
Bio-diesel should be purchased only from
recognized and authorized diesel fuel
suppliers.
22
BY Series Operation Manual
© 2008 Yanmar Marine International
BEFORE YOU OPERATE
Additional Technical Fuel
Requirements
Diesel Fuel Lines
• The fuel cetane number should be equal
to 48 or higher.
• The sulfur content must not exceed 0.3%
by volume. Less than 0.05% is preferred.
• Water and sediment in the fuel should not
exceed 0.05% by volume.
• Ash content not to exceed 0.01% by mass.
• Carbon residue content not to exceed
0.35% by volume. Less than 0.1% is
preferred.
• Total aromatics content should not exceed
35% by volume. Less than 30% is
preferred.
• PAH (polycyclic aromatic hydrocarbons)
content should be below 10% by volume.
• NEVER mix kerosene, used engine oil or
residual fuels with the diesel fuel.
• NEVER use Biocide or mix winter and
summer fuels.
• Keep the fuel tank and fuel-handling
equipment clean at all times.
• Poor-quality fuel can reduce engine
performance and / or cause engine
damage.
• Fuel additives are not recommended.
Some fuel additives may cause poor
engine performance. See your authorized
Yanmar marine dealer or distributor for
more information.
• Lubricity HFRR < 400 micrometer ISO
12156 (HFRR: High Frequency
Reciprocating Rig).
(1)
(3)
(4)
(2)
(7) (6)
(5)
0003638A
1
2
3
4
5
6
7
–
–
–
–
–
–
–
Figure 1
To Fuel Feed Pump
Less Than 500 mm (19.68 in.)
Fuel Return Line
Fuel Tank
Fuel Tank Drain Cock
20 - 30 mm (0.75 - 1.125 in.)
Fuel Shutoff Valve
Shown is a typical installation of a boat fuel
system. Fuel supply (Figure 1, (2)) and
return (Figure 1, (4)) lines connect to
fittings at the engine.
Total suction resistance shall be less than
0.1 bar (40 in.Aq). High resistance may
cause poor performance and reduce fuel
system life.
Note: Yanmar supplies a water separating
pre-filter for mounting by the installer. The
engine is also equipped with an on-engine
fine filter.
BY Series Operation Manual
© 2008 Yanmar Marine International
23
BEFORE YOU OPERATE
Filling the Fuel Tank
NOTICE: Operate bilge ventilation
(blowers) for a minimum of 5 minutes to
purge fumes from engine compartment after
refueling. Never operate bilge blower while
refueling. Doing so can pump explosive
fumes into the engine compartment and
result in an explosion.
To Fill the Fuel Tank:
NOTICE: Only fill the fuel tank with diesel
fuel. Filling the fuel tank with gasoline may
result in a fire and will damage the engine.
1. Clean the area around the fuel cap.
2. Remove the fuel cap from the fuel tank
filler port.
3. NOTICE: Hold the hose nozzle firmly
against the filler port while filling. This
prevents static electricity buildup which
could cause sparks and ignite fuel
vapors. Stop fueling when the gauge
shows the fuel tank is full. NOTICE:
NEVER overfill the fuel tank.
4. Replace the fuel cap and hand-tighten.
Over-tightening the fuel cap will
damage it.
Bleeding the Fuel System
The fuel system needs to be bled under the
following conditions:
• Before starting the engine for the first time.
• After running out of fuel and fuel has been
added to the fuel tank.
• After fuel system maintenance, such as
changing the fuel filter and draining the fuel
filter / water separator, or replacing a fuel
system component.
The fuel feed pump is ECU-controlled and
will operate for only 10 seconds when the
key switch is turned ON while the engine is
not running or being started. For this reason,
the key switch must be repeatedly turned
ON then OFF to sufficiently bleed the fuel
system.
1. Turn the key switch on and leave on for
10 seconds. NOTICE: NEVER hold the
key in the START position for longer
than 10 seconds or the starter motor will
overheat.
2. Turn key switch OFF for 5 seconds, then
turn key switch ON for 10 seconds.
3. Repeat steps 1 and 2 five more times.
Note: The engine may run rough and misfire
for a few seconds when first started until any
remaining air is purged from the fuel system.
4. Attempt to start the engine. If the engine
does not start within a reasonable time,
repeat steps 1 and 2 until the engine
starts and runs. NOTICE: NEVER use
an engine starting aid such as ether.
Engine damage will result.
24
BY Series Operation Manual
© 2008 Yanmar Marine International
BEFORE YOU OPERATE
ENGINE OIL
Engine Oil Viscosity
Engine Oil Specifications
Use a full-synthetic long-life engine oil that
meets or exceeds the following guidelines
and classifications:
Select the appropriate engine oil viscosity
based on the ambient temperature shown in
the SAE Service Grade Viscosity Chart
(Figure 2).
Service Categories
0W-30
5W-30
• API Service Categories SM, SL, SJ, SH/
CF and CF
• ACEA Service Categories A3, B3 and B4
0W-40
5W-40
10W-30
Definitions
• API Classification (American Petroleum
Institute)
• ACEA Classification (Association des
Constructeurs Européens d’Automobilies)
Note:
1. Be sure the engine oil, engine oil storage
containers, and engine oil filling
equipment are free of sediment and
water.
2. Change the engine oil after the first 50
hours of operation and then at every 250
hours thereafter.
3. Select the oil viscosity based on the
ambient temperature where the engine is
being operated. See the SAE Service
Grade Viscosity Chart.
4. Yanmar does not recommend the use of
engine oil “additives.”
-4°F 14°F 32°F 50°F 68°F 86°F 104°F 122°F
(-20°C) (-10°C) (0°C) (10°C) (20°C) (30°C) (40°C) (50°C)
0000005B
Figure 2
Note: Yanmar recommends using genuine
Yanmar Marine Oil specially formulated for
the BY engine. Contact your authorized
Yanmar dealer or distributor.
BY Series Operation Manual
© 2008 Yanmar Marine International
25
BEFORE YOU OPERATE
Acceptable Engine Oil
LongLife 01 Oils
Trade name
Producer/Supplier
Addinol Super power MV 0537
Addinol Lube Oil GmbH
Agip Formula LL B 01
ENI S.p.A. Refining and Marketing Division
Agip Sint 2000 Evolution
ENI S.p.A. Refining and Marketing Division
Agip TECSINT SL
ENI S.p.A. Refining and Marketing Division
ALPINE Longlife
Mitan Mineralöl GmbH
Aral SuperTronic B
Aral
Aral SuperTronic G
Aral
AXCL S-Class Motor Oil
AXCL Gulf FZE
BMW Quality Longlife 01
BMW
BP Visco 7000
BP Oil International
BP Visco 7000 GM
BP Oil International
BP Visco 7000 Turbo Diesel
BP Oil International
Castrol Edge
Castrol Limited
Castrol Formula RS Power and Protection
Castrol Limited
Castrol Formula SLX
Castrol Limited
Castrol Formula SLX LL01
Castrol Limited
Castrol Formula SLX Long Tex
Castrol Limited
Castrol Formula SLX Turbodiesel
Castrol Limited
Castrol Syntec
Castrol Limited
Castrol Syntec 0W-30 European Formula
Castrol Limited
Castrol Super Racing 0W-40
Castrol Limited
Castrol TXT Softec LL01
Castrol Limited
Cepsa Star Mega Synthetic
Cepsa Lubricantes S.A.
Divinol Syntholight
Zeller+Gmelin
Elf Excellium Full-Tech
Total
Elf Excellium LDX
Total
Elf Excellium XLL
Total
Esso Ultron FE
ExxonMobil
Galp Formula XLD
Petrogal SA
Gulf Formula TLX
Total
Havoline Synthetic BM
Chevron Texaco
Havoline Ultra BM
Chevron Texaco
Igol Process Compact P
Igol France S.A.
INA Futura Compact P
INA Maziva Rijeka
Jet Top Level
ConocoPhillips GmbH
Labo RC
Fuchs Labo Auto S.A.
Liqui Moly Longtime High Tech
Liqui Moly
Megol Motorenöl New Generation
Meguin GmbH
Mobil 1
ExxonMobil
Mobil 1 Turbo Diesel
ExxonMobil
26
BY Series Operation Manual
© 2008 Yanmar Marine International
BEFORE YOU OPERATE
Trade name
Producer/Supplier
Mobil 1 Spezial XS
ExxonMobil
Motorex Profile B-XL
Bucher AG
Motorex Select SP-X
Bucher AG
Motul Specific LL-01
Motul S.A.
OMV full syn plus
OMV AG
Opaljet Longlife
Unil Opal
Panolin Exclusive BD
Panolin AG
Pennzoil European Formula Ultra
Pennzoil-Quaker State
Pentospeed 0W-30 VS*
Deutsche Pentosin-Werke
Petronas Syntium 3000 LL
Petronas
Q8 Formula Special
Kuwait Petroleum
Quaker State European Formula Ultra
Pennzoil-Quaker State
Ravenol HCL
Ravensburger Schmierstoffvertrieb GmbH
Repsol Elite Common Rail
Repsol YPF
Shell Helix Ultra AB
Shell International Petroleum Company
Shell Helix Ultra AL
Shell International Petroleum Company
Statoli LazerWay B
Statoil Lubricants
Tecar Motorenöl Supersyn
Techno-Einkauf GmbH
Titan Supersyn SL
Fuchs Petrolub AG
Titan Supersyn SL Longlife
Fuchs Petrolub AG
Tor Synthetic LL
De Oliebron
Total Activa Expertise 9000
Total
Total Quartz Expertise 9000
Total
Valvoline SynPower MXL
Valvoline
Veedol Powertron LL01
Veedol International
Veedol Syntron
Veedol International
Veritas Syntolube
Ölwerke Julius Schindler GmbH
Wako’s Super Synthe
Wako Chemical Co.Ltd
Wintershall VIVA 1 Longlife
SRS Schmierstoff Vertrieb GmbH
Yacco VX 1600
Yacco S.A.S.
BY Series Operation Manual
© 2008 Yanmar Marine International
27
BEFORE YOU OPERATE
LongLife 04 Oils
Trade name
Producer/Supplier
Addinol Super power MV 0537
Addinol Lube Oil GmbH
Agip Formula MS B04
ENI S.p.A.
Aral SuperTronic
Aral
BMW Longlife-04
BMW
Castrol Edge Sport
Castrol Limited
Castrol Edge Turbo Diesel
Castrol Limited
Castrol Formula RS
Castrol Limited
Castrol GTX Magnatec
Castrol Limited
Castrol SLX LL-04
Castrol Limited
Castrol TXT LL-04
Castrol Limited
Elf Excellium LSX
Total
Galp Energy Ultra LS
Petrogal SA
Liqui Moly TopTec 4100
Liqui Moly
Midland ® Synova
Oel-Brack AG
Midland ® Synova
Oel-Brack AG
Mobil 1 ESP Formula
ExxonMobil
Motorenöl Low Emission
Meguin GmbH
Motul 1 Specific LL-04
Motul S.A.
OMV eco plus
OMV AG
Repsol Elite Evolution
Repsol YPF
Shell Helix Ultra AP
Shell International Petroleum Company
Titan GT1
Fuchs Petrolub AG
Wintershall VIVA 1 topsynth alpha LS
SRS Schmierstoff Vertrieb GmbH
York 848
Ginouves SAS
28
BY Series Operation Manual
© 2008 Yanmar Marine International
BEFORE YOU OPERATE
Checking Engine Oil
Adding Engine Oil
(1)
(2)
(1)
0006568
Figure 3
Note: 4BY2 series shown. 6BY2 is similar.
1. NOTICE: Prevent dirt and debris from
contaminating engine oil. Carefully
clean the dipstick and the surrounding
area before you remove the cap.Clean
area around dipstick.
2. Remove dipstick (Figure 3, (1)) and
wipe with clean cloth.
3. Fully reinsert dipstick.
4. Remove dipstick. The oil level should be
between upper (Figure 4, (1)) and
lower lines (Figure 4, (2)) on the
dipstick.
(1)
(2)
0006565
Figure 5
Note: 4BY2 series shown. 6BY2 is similar.
1. Remove the oil filler port cap
(Figure 5, (2)) and pour engine oil into
filler port. See Engine Oil Specifications
on page 25.
2. Fill with oil to the upper limit on the
dipstick (Figure 4, (1)). NOTICE:
NEVER overfill the engine with engine
oil.
3. Fully insert the dipstick to check the
level. NOTICE: ALWAYS keep the oil
level between upper and lower lines on
the dipstick.
4. Tighten the fill port cap securely by
hand.
0003826
Figure 4
5. Fully reinsert dipstick.
BY Series Operation Manual
© 2008 Yanmar Marine International
29
BEFORE YOU OPERATE
MARINE GEAR OR STERN
DRIVE OIL
POWER STEERING FLUID
SPECIFICATIONS
Refer to the instruction book for each marine
gear or stern drive.
Refer to the stern drive manufacturer’s
literature for power steering fluid
specifications.
Checking Power Steering Fluid
Level
1. Remove power steering filler cap.
2. Power steering fluid level must be
between the upper (Figure 6, (1)) and
lower (Figure 6, (2)) level marks.
(1 )
(2 )
Figure 6
3. Add fluid if necessary.
30
0004042
BY Series Operation Manual
© 2008 Yanmar Marine International
BEFORE YOU OPERATE
ENGINE COOLANT
Acceptable Engine Coolant
Trade Name
Manufacturer
Addinol Antifreeze Super
Addinol Lube Oil GmbH
Aral Antifreeze Extra
Aral AG
AVIA Antifreeze APN
AVIA Mineralöl AG
BMW Coolant
BMW AG
BP anti-frost X 2270A
BP Schmierstoff GMBH, Hamburg
Caltex CX Engine Coolant
Caltex
Castrol ANTI-FREEZE NF
Castrol International
Fridex G48
Velena s.a.
Glacelf Plus
Total
GlycoShell
Shell International
Glyco star
Bremin Mineralöl GmbH & Co.
Glysantin G48-24 Engine Coolant
UNICO Ltd.
Glysantin Protect Plus / G48
BASF
GUSOFROST LV 505
Chemische Industrielle Gesellschaft
Mobil Frostchutz 600
Mobil Schmierstoff GmbH
Havoline AFC (BD04)
Chevron Texaco/Arteco
Mobil Frostschutz 600
ExxonMobil
OMV Kühlerfrostschutz
OMV AG
Total Thermofreeze Plus
Total
Note: Yanmar recommends using genuine Yanmar antifreeze / coolant. Contact your
authorized Yanmar dealer or distributor.
BY Series Operation Manual
© 2008 Yanmar Marine International
31
BEFORE YOU OPERATE
Adding Engine Coolant
1. Remove the pressure cap and pour
coolant mix slowly into the heat
exchanger to prevent the formation of
air pockets. Fill until the heat exchanger
is completely full. NOTICE: Only use the
engine coolant specified. Other engine
coolants may affect warranty coverage,
cause an internal buildup of rust and
scale and / or shorten engine life.
Prevent dirt and debris from
contaminating engine coolant. Carefully
clean the filler cap and the surrounding
area before you remove the cap.
NEVER mix different types of engine
coolants. This may adversely affect the
properties of the engine coolant.
2. Start the engine and allow to idle for
approximately 5 minutes.
3. Stop the engine and check the coolant
level. Add additional coolant if
necessary.
4. Install the pressure cap and tighten
firmly. WARNING! Securely tighten
the filler cap after checking the
coolant level. Steam can escape
during engine operation if the cap is
loose.
5. Remove the coolant recovery tank cap
and fill with coolant mix to approximately
50 mm (2 in.) below the full line. Replace
cap. Never fill to the full line.
6. After filling an empty cooling system,
test-run the engine for about five
minutes and check the engine coolant
level at the recovery tank again.
32
BY Series Operation Manual
© 2008 Yanmar Marine International
ENGINE OPERATION
Exhaust Hazard
WARNING
Fire and Explosion Hazard
Avoid serious personal injury.
NEVER jump-start the
engine. Sparks caused by
shorting the battery to the
starter terminals may cause a
fire or explosion. ONLY use the key switch
to start the engine.
Avoid serious injury or death.
NEVER block windows, vents
or other means of ventilation if
the engine is operating in an
enclosed area. All internal
combustion engines create carbon
monoxide gas during operation and special
precautions are required to avoid carbon
monoxide poisioning.
Sudden Movement Hazard
Be sure the boat is in open water away from
other boats, docks or other obstructions
before increasing rpm. Avoid unexpected
equipment movement. Shift the marine gear
into the NEUTRAL position any time the
engine is at idle.
To prevent accidental equipment
movement, NEVER start the engine in gear.
Sever Hazard
Keep children and pets away
while the engine is operating.
BY Series Operation Manual
© 2008 Yanmar Marine International
33
ENGINE OPERATION
STARTING THE ENGINE
NOTICE
If any indicator illuminates during engine
operation, stop the engine immediately.
Determine the cause and repair the problem
before you continue to operate the engine.
If the alarm window with audible alarm fails
to display and go out about three seconds
later when the ignition switch is in the ON
position, see your authorized Yamar marine
dealer or distributor for service before
operating the engine.
Observe the following environmental
operating conditions to maintain engine
performance and avoid premature engine
wear:
• Avoid operating in extremely dusty
conditions.
• Avoid operating in the presence of
chemical gases or fumes.
• NEVER run the engine if the ambient
temperature is above +40°C (+104°F) or
below -16°C (+5°F).
• If the ambient temperature exceeds +40°C
(+104°F), the engine may overheat and
cause the engine oil to break down.
• If the ambient temperature is below -16°C
(+5°F), rubber components such as
gaskets and seals will harden causing
premature engine wear and damage.
• Contact your authorized Yanmar marine
engine dealer or distributor if the engine
will be operated outside of this standard
temperature range.
NEVER engage the starter motor while the
engine is running. Damage to the starter
motor pinion and / or ring gear will result.
34
NOTICE: If the vessel is equipped with a
water lift (water lock) muffler, excessive
cranking could cause sea water to enter the
cylinders and damage the engine. If the
engine does not start after cranking for 10
seconds, close the thru-hull water intake
valve to avoid filling the muffler with water.
Crank for 10 seconds or until the engine
starts. When the engines does start, stop the
engine immediately and press the switch to
the OFF position.
1. Open the seacock (if equipped).
2. Open the fuel cock.
3. Turn the battery master switch (if
equipped) ON.
4. Put remote control handle in NEUTRAL.
5. Ensure lanyard is connected to
emergency stop switch.
6. Attach lanyard to clothing.
7. Turn key switch to ON. Ensure that the
instrument panel indicators are
powered and working. CAUTION!
NEVER hold the key in the START
position for longer than 10 seconds
or the starter motor will overheat.
8. Turn key switch to START. Release the
key switch when the engine has started.
Note: Once the engine has started, the ECU
will raise the engine speed to 1080 rpm to
start alternator charging, and then reduce to
low idle rpm.
BY Series Operation Manual
© 2008 Yanmar Marine International
ENGINE OPERATION
Starting at Low Temperatures
NOTICE: NEVER use an engine starting aid
such as ether. Engine damage will result.
Comply with local environmental
requirements. Use optional glow plugs (if
equipped) to avoid starting problems and
white smoke.
To limit white smoke, run the engine at low
speed and under moderate load until the
engine reaches normal operating
temperature. A light load on a cold engine
provides better combustion and faster
engine warm-up than no load.
Avoid running the engine at idling speed any
longer than necessary.
SHUTTING DOWN THE
ENGINE
Under normal operating conditions, shut
down the engine by turning the key switch to
OFF.
There will be a delay of up to 3 seconds after
turning the key to OFF. This is normal and
allows the ECU computer to store data. Wait
at least 10 seconds after the engine stops
before turning the battery master switch to
OFF.
Emergency Shut Down
NOTICE: NEVER use the emergency stop
switch for a normal engine shut-down. Use
this switch only when stopping the engine
suddenly in an emergency.
1. Ensure lanyard is connected to the
emergency stop switch.
2. Attach the lanyard to a secure place on
the operator’s clothing or life vest - not
where it might tear away.
NOTICE: Do not cut or re-tie the
lanyard. If it is too long, shorten it by
knotting or looping it. Test the
emergency engine shut off switch
before each outing.
3. Disconnecting the clip from the stop
switch will stop the engine.
NOTICE: Be sure to close the seacock.
Neglecting to close the seacock could allow
water to leak into the boat and may cause it
to sink.
BY Series Operation Manual
© 2008 Yanmar Marine International
35
ENGINE OPERATION
CHECKING THE ENGINE
AFTER OPERATION
• Check that the key switch is in the OFF
position and battery master switch (if
equipped) is OFF.
• Fill the fuel tank. Make sure that the fill cap
and the area around the fill opening are
clean to avoid contamination of the fuel.
• Close seawater cock(s).
• If there is a risk of freezing, check that the
cooling system contains enough coolant.
See Engine Coolant on page 31.
• If there is a risk of freezing, drain the
seawater system. See Draining the
Seawater Cooling System on page 70.
36
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
SAFETY PRECAUTIONS
WARNING
Crush Hazard
If you need to transport an engine
for repair, have a helper assist you
attach it to a hoist and load it on a
truck.
Avoid personal injury or equipment damage.
The engine lifting eyes are engineered to lift
the weight of the marine engine only.
ALWAYS use the engine lifting eyes when
lifting the engine.
Avoid serious personal injury. Additional
equipment is necessary to lift the marine
engine and marine gear together. ALWAYS
use lifting equipment with sufficient capacity
to lift the marine engine.
Welding Hazard
Make welding repairs safely.
• ALWAYS turn off the battery switch (if
equipped) or disconnect the negative
battery cable and the leads to the
alternator when welding on the equipment.
• Remove the multi-pin connector to the
engine control unit. Connect the weld
clamp to the component to be welded and
as close as possible to the welding point.
• NEVER connect the weld clamp to the
engine or in a manner which would allow
current to pass through a mounting
bracket.
• When welding is completed, reconnect the
leads to the alternator and engine control
unit prior to reconnecting the batteries.
Exhaust Hazard
Avoid serious injury or death.
ALWAYS ensure that all
connections are tightened to
specifications after repair is
made to the exhaust system.
All internal combustion engines create
carbon monoxide gas during operation and
special precautions are required to avoid
carbon monoxide poisioning.
BY Series Operation Manual
© 2008 Yanmar Marine International
37
PERIODIC MAINTENANCE
WARNING
NOTICE
Shock Hazard
Avoid serious personal injury or
equipment damage. ALWAYS
turn off the battery switch (if
equipped) or disconnect the
negative battery cable before servicing the
equipment.
Avoid personal injury or equipment damage.
ALWAYS keep the electrical connectors
and terminals clean. Check the electrical
harnesses for cracks, abrasions, and
damaged or corroded connectors.
38
Any part which is found defective as a result
of inspection, or any part whose measured
value does not satisfy the standard or limit,
must be replaced.
Modifications may impair the engine’s
safety and performance characteristics and
shorten the engine’s life. Any alterations to
this engine may void its warranty. Be sure to
use Yanmar genuine replacement parts.
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
PRECAUTIONS
The Importance of Periodic
Maintenance
Engine deterioration and wear occur in
proportion to the length of time the engine
has been in service and the conditions the
engine is subjected to during operation.
Periodic maintenance prevents unexpected
downtime, reduces the number of accidents
due to poor machine performance and helps
extend the life of the engine.
Keep a Log of Engine Hours and
Daily Checks
Keep a log of the number of hours the engine
is run each day and a log of the daily checks
performed. Also note the date, type of repair
(e.g., replaced alternator), and parts used
for any service needed between the periodic
maintenance intervals. Periodic
maintenance intervals are every 50, 250,
500, 1000 and 2000 engine hours. Failure to
perform periodic maintenance will shorten
the life of the engine.
Yanmar Replacement Parts
Performing Periodic
Maintenance
WARNING! NEVER block windows,
vents, or other means of ventilation if
the engine is operating in an enclosed
area. All internal combustion engines
create carbon monoxide gas during
operation. Accumulation of this gas
within an enclosure could cause illness
or even death. Make sure that all
connections are tightened to
specifications after repair is made to the
exhaust system. Failure to comply could
result in death or serious injury.
The Importance of Daily Checks
Periodic Maintenance Schedules assume
that the daily checks are performed on a
regular basis. Make it a habit of performing
daily checks before the start of each
operating day. See Daily Checks on page
46.
Yanmar recommends that you use genuine
Yanmar parts when replacement parts are
needed. Genuine replacement parts help
ensure long engine life.
Tools Required
Before you start any periodic maintenance
procedure, make sure you have the tools
you need to perform all of the required tasks.
Ask Your Authorized Yanmar
Marine Dealer or Distributor For
Help
Our professional service technicians have
the expertise and skills to help you with any
maintenance or service related procedures.
Required EPA Maintenance
To maintain optimum engine performance
and compliance with the Environmental
Protection Agency (EPA) Regulations
Engines, it is essential that you follow the
Periodic Maintenance Schedule on page
42 and Periodic Maintenance Procedures
on page 48.
BY Series Operation Manual
© 2008 Yanmar Marine International
39
PERIODIC MAINTENANCE
EPA REQUIREMENTS
The EPA emission regulation is applicable
only in USA.
Conditions to Ensure
Compliance with EPA Emission
Standards
This product is an EPA-approved engine.
The following are the conditions that must be
met in order to ensure that the emissions
during operation meet the EPA standards:
• Ambient temperature: -16° to +40°C
(3° to 104°F)
• Relative humidity: 80% or lower
The fuel and lubricating oil used should be
as follows:
• Diesel fuel: ASTM D975 No. 1–D or No. 2–
D, or equivalent (minimum cetane No. 45)
• Lubricating oil: Type API, Class SM, SL,
SJ, SH/CF and CF
Be sure to perform inspections as outlined
in Periodic Maintenance Procedures on
page 48 and keep a record of the results.
Inspection and Maintenance
See Inspection and Maintenance of EPA
Emission-Related Parts on page 46.
Inspection and maintenance procedures
not shown in the Inspection and
Maintenance of EPA Emission-Related
Parts on page 46 are covered in Periodic
Maintenance Schedule on page 42.
This maintenance must be performed to
keep the emission values of your engine in
the standard values during the warranty
period. The warranty period is determined
by the age of the engine or the number of
hours of operation. See Yanmar Co., Ltd.
Limited Emission Control System Warranty
- USA Only on page 75.
Tightening Fasteners
Use the correct amount of torque when you
tighten fasteners on the machine. Applying
excessive torque may damage the fastener
or component and not enough torque may
cause a leak or component failure.
Pay particular attention to these important
points:
• Replacing the engine oil
• Replacing the lube oil filter
• Replacing the fuel filter
• Cleaning the air filter
Note: Inspections are divided into two
sections in accordance with who is
responsible for performing the inspection:
the user or the maker.
40
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
Standard Torque Values
Hexagon Bolts and Nuts
Nominal Diameter
Grade (Lubricated)
8.8 or 8
10.9 or 10
12.9 or 12
M4
2.7 N·m (24 in.-lb)
3.88 N·m (34.3 in.-lb)
4.6 N·m (41 in.-lb)
M5
5.5 N·m (48.6 in.-lb)
8 N·m (71 in.-lb)
9.5 N·m (84 in.-lb)
M6
9.5 N·m (84 in.-lb)
13 N·m (115 in.-lb)
16 N·m (142 in.-lb)
M7
15 N·m (133 in.-lb)
22 N·m (195 in.-lb)
26 N·m (230 in.-lb)
M8
23 N·m (204 in.-lb)
32 N·m (24 ft-lb)
39 N·m (29 ft-lb)
M8 x 1
25 N·m (221 in.-lb)
35 N·m (26 ft-lb)
42 N·m (31 ft-lb)
M10
46 N·m (34 ft-lb)
64 N·m (47 ft-lb)
77 N·m (57 ft-lb)
M10 x 1.25
49 N·m (36 ft-lb)
68 N·m (50 ft-lb)
82 N·m (60 ft-lb)
M12
80 N·m (59 ft-lb)
110 N·m (81 ft-lb)
135 N·m (100 ft-lb)
M12 x 1.5
88 N·m (65 ft-lb)
125 N·m (92 ft-lb)
150 N·m (111 ft-lb)
Hose Clamps
Note: Reuse and retightening is prohibited
for all hose clamps. Always install new hose
clamps.
Size
Specification
5mm Hex Head
1.0 - 1.5 N·m (8.9 - 13 in.-lb)
6mm Hex Head
2.5 - 3.5 N·m (22 - 31 in.-lb)
BY Series Operation Manual
© 2008 Yanmar Marine International
41
PERIODIC MAINTENANCE
PERIODIC MAINTENANCE
SCHEDULE
Daily and periodic maintenance is important
to keep the engine in good operating
condition. The following is a summary of
maintenance items by periodic
maintenance intervals. Periodic
maintenance intervals vary depending on
engine application, loads, diesel fuel and
engine oil used and are hard to establish
definitively. The following should be treated
only as a general guideline.
42
CAUTION! Establish a periodic
maintenance plan according to the
engine application and make sure you
perform the required periodic
maintenance at intervals indicated.
Failure to follow these guidelines will
impair the engine’s safety and
performance characteristics, shorten
the engine’s life and may affect the
warranty coverage on your engine. See
your authorized Yanmar marine dealer
or distributor for assistance when
checking items marked with a ●.
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
○: Check or Clean ◊: Replace ●: Contact your authorized Yanmar marine dealer or distributor
System
Item
Periodic Maintenance Interval
Daily
See Daily
Checks
on page
46
Whole
Visual
inspection of engine
exterior
Fuel System
Check for fuel
leakage
○
Before
starting
Check the fuel
level and refill if
necessary
○
Before
starting
Every
50
hours or
monthly
whichever
comes
first
◊
Replace fuel
filter / water
separator element
◊
●
○
Before
starting
Change the engine oil and replace the oil filter
element
Cooling
System Engine
Coolant
◊
Initial 50
Visual inspection of cooling
system
○
Before
starting
Check coolant
level and check
for leaks
○
Before
starting
Replace coolant
Every
2000
hours
or 8
years
whichever
comes
first
○
Replace the fuel
fine filter
Check the engine oil level and
refill if necessary
Every
1000
hours
or 4
years
whichever
comes
first
○
Check the fuel
pump and fuel
lines
Lubricating
System
Every
500
hours
or 2
years
whichever
comes
first
○
Before
starting
Drain water and
sediment from
fuel tank
Drain the fuel
filter / water separator If
necessary
Every
250
hours
or one
year
whichever
comes
first
◊
When Long Life Coolant (LLC) is used, replace every two years.
BY Series Operation Manual
© 2008 Yanmar Marine International
43
PERIODIC MAINTENANCE
○: Check or Clean ◊: Replace ●: Contact your authorized Yanmar marine dealer or distributor
System
Item
Periodic Maintenance Interval
Daily
See Daily
Checks
on page
46
Cooling
System Seawater
Circuit
Visual
inspection of
cooling system
○
Before
starting
Check the
seawater outlet
○
Before
starting
Every
50
hours or
monthly
whichever
comes
first
Check seawater
pump belt for
wear, replace if
necessary
◊
Check or
replace the seawater pump
impeller
●
Check the air
intake system
44
○
Before
starting
Replace turbocharger heat
shield
Check the
exhaust pipe
Every
1000
hours
or 4
years
whichever
comes
first
Every
2000
hours
or 8
years
whichever
comes
first
○
Replace the
anodes*
Visual inspection
Every
500
hours
or 2
years
whichever
comes
first
◊
Check seawater
filter (if
equipped) and
inlet
Air Intake
and
Exhaust
System
Every
250
hours
or one
year
whichever
comes
first
◊
○
○
Check the
exhaust / water
mixing elbow
●
Replace the air
filter element
●
BY Series Operation Manual
© 2008 Yanmar Marine International
●
PERIODIC MAINTENANCE
○: Check or Clean ◊: Replace ●: Contact your authorized Yanmar marine dealer or distributor
System
Item
Periodic Maintenance Interval
Daily
See Daily
Checks
on page
46
Electrical
System
Every
50
hours or
monthly
whichever
comes
first
Check the
electrolyte level
in the battery
(serviceable batteries only)
Check the wiring
connectors
*
Every
1000
hours
or 4
years
whichever
comes
first
Every
2000
hours
or 8
years
whichever
comes
first
○
Before
starting
○
Check the alarm
and indicators (if
equipped)
○
Check or
change power
steering fluid
●
Check for water
or oil leakage
Every
500
hours
or 2
years
whichever
comes
first
●
Check alternator
belt for wear,
replace if
necessary
Miscellaneous Items
Every
250
hours
or one
year
whichever
comes
first
●
●
○
Before
starting
Check shift
cable adjustment
●
Initial 50
●
Adjust the
propeller shaft
alignment (if
equipped with
marine gear)
●
Initial 50
●
Check hydraulic
oil cooler
●
Check and
replace
rubberized hoses (fuel and water)
●
Check flexible
engine mounts
○
●
Check anodes periodically. Any anode having less than half its original size remaining should be replaced use this to establish a regular replacement interval.
Note: These procedures are considered
normal maintenance and are performed at
the owner’s expense.
BY Series Operation Manual
© 2008 Yanmar Marine International
45
PERIODIC MAINTENANCE
Inspection and Maintenance of
EPA Emission-Related Parts
Parts
Interval
Check fuel injection nozzle
(cleaning)
1500 hours
Check fuel injection nozzle
(adjustment)
Check fuel injection pump
(adjustment)
Check turbocharger (adjustment)
3000 hours
Check electronic engine
control unit (ECU) and its
associated sensors and
actuators
Note: The inspection and maintenance
items shown above are to be performed at
your Yanmar dealer or distributor.
46
DAILY CHECKS
Before heading out for the day, make sure
the Yanmar engine is in good operating
condition. CAUTION! It is important to
perform daily checks as listed in this
Operation Manual.Periodic
maintenance prevents unexpected
downtime, reduces the number of
accidents due to poor engine
performance and helps extend the life of
the engine. Make sure you check the
following items:
Visual Checks
• Check the exterior of the engine for leaks,
wear or damage.
• Check for engine oil leaks.
• Check for fuel leaks.
• Check for engine coolant leaks.
• Check for damaged or missing parts.
• Check for loose, missing, or damaged
fasteners.
• Check the seawater inlet and outlet for
blockage or damage.
• Check the electrical harnesses for cracks,
abrasions, and damaged or corroded
connectors.
• Check hoses for cracks, abrasions, and
damaged, loose or corroded clamps.
CAUTION! If any problem is noted
during the visual check, the necessary
corrective action should be taken before
you operate the engine.
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
Checking Diesel Fuel, Engine Oil
and Engine Coolant Levels
Follow the procedures in Filling the Fuel
Tank on page 24 and Checking Engine Oil
on page 29 to check these levels.
Checking the Battery Electrolyte
Level
Check the battery electrolyte level before
use. See Checking the Battery Electrolyte
Level (Serviceable Batteries Only) on page
49.
Checking the Alarm Indicators
Check the instruments and alarm indicators
at regular intervals.
Preparing Fuel, Oil and Coolant in
Reserve
Prepare sufficient fuel for the day’s
operation. Always store engine oil and
coolant in reserve (for at least one refill) on
board, to be ready for emergencies.
Draining the Fuel / Water
Separator
Check the fuel filter / water separator for
presence of water and contaminants. If you
find any water or contaminants, drain the
fuel filter / water separator. If you have to
drain the fuel filter / water separator
frequently, drain the fuel tank and check for
water in your fuel supply. See Draining the
Fuel Tank on page 51.
1. Turn engine OFF.
2. Ensure the fuel cock is closed.
3. Loosen the drain plug at the bottom of
the fuel filter / water separator and drain
off any water or sediment.
4. Dispose of waste properly.
5. Tighten the drain plug and open the fuel
cock.
Checking Power Steering Fluid
See Checking Power Steering Fluid Level
on page 30.
BY Series Operation Manual
© 2008 Yanmar Marine International
47
PERIODIC MAINTENANCE
PERIODIC MAINTENANCE
PROCEDURES
After Initial 50 Hours of
Operation
Perform the following maintenance
procedures after the initial 50 hours of
operation.
3. NOTICE: Prevent dirt and debris from
contaminating engine oil. Carefully
clean the dipstick and the surrounding
area before you remove the cap.Loosen
the engine oil filter cap (Figure 1, (2)) 1
- 2 turns with a socket wrench. Allow to
sit a few minutes to allow oil to drain into
crankcase.
(2)
(1)
• Changing the Engine Oil and
Replacing the Engine Oil Filter
• Checking Shift Cable Adjustment
• Adjusting the Propeller Shaft
Alignment (If Equipped with Marine
Gear)
Changing the Engine Oil and
Replacing the Engine Oil Filter
The engine oil on a new engine becomes
contaminated from the initial break-in of
internal parts. It is very important that the
initial oil replacement is performed as
scheduled.
It is easiest and most effective to drain the
engine oil after operation while the engine is
still warm. WARNING! If you must drain
the engine oil while it is still hot, stay
clear of the hot engine oil to avoid being
burned. ALWAYS wear eye protection.
0003653
4.
5.
6.
7.
Figure 1
Remove the engine oil dipstick
(Figure 1, (1)). Attach an oil drain pump
and pump out the oil. Dispose of waste
properly.
Remove the engine oil filter cap and
filter assembly.
Remove the filter element from stem.
Replace the three O-rings
(Figure 2, (1)) on the stem.
(1)
1. Turn engine OFF.
2. Remove engine cover.
0003652
Figure 2
48
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
8. Install a new filter element. Ensure the
filter fits snugly in the filter cap.
9. Install the cap and filter assembly.
Tighten cap by hand until the seal
touches the housing.
10. Tighten to 25 N·m (225 in.-lb).
11. Fill with new engine oil. See Adding
Engine Oil on page 29.
NOTICE: NEVER mix different types of
engine oil. This may adversely affect the
lubricating properties of the engine oil.
NEVER overfill. Overfilling may result in
white exhaust smoke, engine
overspeed or internal damage.
12. Perform a trial run and check for oil
leaks.
13. Approximately 10 minutes after
stopping the engine, remove the oil
dipstick and check the oil level. Add oil
if the level is too low.
Checking Shift Cable Adjustment
See your authorized Yanmar dealer or
distributor.
Adjusting Propeller Shaft Alignment
(If Equipped with Marine Gear)
The flexible engine mounts are slightly
compressed during initial engine operation
and may cause misalignment between the
engine and the propeller shaft.
This adjustment requires specialized
knowledge and techniques. See your
authorized Yanmar dealer or distributor.
Every 50 Hours of Operation
After you complete the initial 50 hour
maintenance procedures, perform the
following procedures every 50 hours or
monthly, whichever comes first.
• Checking Seawater Filter (If Equipped)
and Inlet
• Checking the Air Intake System
• Checking Battery Electrolyte Level
(Serviceable Batteries Only)
Checking the Seawater Filter (If
Equipped) and Inlet
Refer to boat builder’s literature for
information on the seawater filter.
Checking the Air Intake System
Check the air intake system for damage or
wear. If necessary, consult your authorized
Yanmar dealer or distributor for repair.
Checking the Battery Electrolyte
Level (Serviceable Batteries Only)
WARNING! Batteries contain sulfuric
acid. NEVER allow battery fluid to come
in contact with clothing, skin or eyes.
Severe burns could result. ALWAYS
wear safety goggles and protective
clothing when servicing the battery. If
battery fluid contacts the eyes and / or
skin, immediately flush the affected area
with a large amount of clean water and
obtain prompt medical treatment.
NOTICE: NEVER turn off the battery switch
(if equipped) or short the battery cables
during operation. Damage to the electric
system will result.
1. Turn the battery master switch OFF (if
equipped) or disconnect the negative (-)
battery cable.
2. Do not operate with insufficient battery
electrolyte as the battery will be
destroyed.
BY Series Operation Manual
© 2008 Yanmar Marine International
49
PERIODIC MAINTENANCE
3. NOTICE: NEVER attempt to remove the
covers or fill a maintenance-free battery.
Remove the caps and check the
electrolyte level in all cells.
4. If the level is lower than the minimum fill
level (Figure 3, (1)), fill with distilled
water (Figure 3, (2)) (available locally)
up to the upper limit (Figure 3, (3)) of
the battery.
(3)
(2)
(1)
0002388
Figure 3
Note: The maximum fill level is
approximately 10 - 15 mm (3/8 - 9/16 in.)
above the plates. Battery fluid tends to
evaporate in high temperatures, especially
in summer. In such conditions, inspect the
battery more often.
50
Every 250 Hours of Operation
Perform the following maintenance every
250 hours of operation or yearly, whichever
comes first.
• Draining the Fuel Tank
• Replacing the Fuel Fine Filter
• Replacing the Fuel Filter / Water
Separator Element
• Changing the Engine Oil and
Replacing the Engine Oil Filter
Element
• Checking or Replacing the Seawater
Pump Belt
• Replacing the Anodes
• Checking or Replacing the Seawater
Pump Impeller
• Replacing the Turbocharger Heat
Shield
• Checking the Exhaust / Water Mixing
Elbow
• Replacing the Air Filter Element
• Cleaning the Turbocharger Blower
• Checking or Replacing the Alternator
Belt
• Changing the Power Steering Fluid
• Checking the Shift Cable Adjustment
• Adjusting the Propeller Shaft
Alignment
• Checking the Hydraulic Oil Cooler
• Checking or Replacing Rubber Hoses
• Checking Flexible Engine Mounts
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
Replacing the Fuel Fine Filter
Draining the Fuel Tank
1. Disconnect the battery negative (-)
cable.
2. Close the fuel tank cock.
(3)
(1)
(1)
(2)
0004542
Figure 4
1 – Sediment Bowl
2 – Drain Cock
3 – Fuel Line to Engine
Note: Typical fuel tank shown. Actual
equipment may differ.
1. Turn engine OFF.
2. Put a container under the drain cock
(Figure 4, (2)) to catch fuel.
3. Open the drain cock and drain water
and sediment. Close the drain cock
when the fuel is clean.
4. Dispose of waste properly.
0006638
Figure 5
3. Unscrew and remove filter cartridge
(Figure 5, (1)).
4. Replace rubber seal.
5. Replace filter. NOTICE: When replacing
fuel filters, always pre-fill them with
fresh, clean fuel to improve the system's
ability to be bled.
6. Hand-tighten cartridge to filter.
7. Connect battery negative (-) cable.
8. Bleed the fuel system and check for
leaks. See Bleeding the Fuel System on
page 24.
BY Series Operation Manual
© 2008 Yanmar Marine International
51
PERIODIC MAINTENANCE
Replacing Fuel Filter / Water
Separator Element
Note: Yanmar supplies a water separating
pre-filter separate from the engine. Location
and type of filter may vary.
1. Disconnect the battery negative (-)
cable.
2. Close the fuel tank cock.
3. Loosen the drain plug (Figure 6, (4)) on
the bottom of the fuel filter / water
separator and drain off any water or
sediment.
4. Disconnect water sensor connector
(Figure 6, (1)).
5. Turn the filter bowl (Figure 6, (5))
counterclockwise to remove.
6. Remove the old filter element.
7. Clean the filter bowl. Inspect the water
sensor probe (Figure 6, (1)) for
damage if equipped. Inspect the bowl
seal (Figure 6, (2)).
NOTICE: When replacing fuel filters,
always pre-fill them with fresh, clean fuel
to improve the system's ability to be
bled.
(3)
(2)
(5)
(1)
(4)
0003650
Figure 6
8. Lubricate the seal at the top of the new
filter element (Figure 6, (3)) and install .
9. Lubricate the filter bowl seal
(Figure 6, (2)) and install the filter bowl
(Figure 6, (5)). Turn clockwise by hand
to tighten.
10. Ensure drain plug (Figure 6, (4)) is
securely tightened.
11. Connect water sensor connector
(Figure 6, (1)) if equipped.
12. Open the fuel cock.
13. Connect the battery negative (-) cable.
52
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
14. Bleed air from the fuel system and
check for leaks. See Bleeding the Fuel
System on page 24.
Replacing the Zinc Anodes
Changing the Engine Oil and
Replacing Engine Oil Filter Element
To change engine oil and replace the engine
oil filter element, see Changing the Engine
Oil and Replacing the Engine Oil Filter on
page 48.
(2)
Checking or Replacing the Seawater
Pump and Alternator Belts
(1)
0006569
Figure 8
There are zinc anodes in the seawater
cooling system and they should be
inspected and replaced periodically.
(2)
(1)
0003662
Figure 7
NOTICE: NEVER get any oil on the belt(s).
Oil on the belt causes slipping and
stretching. Replace the belt if it is damaged.
1. Disconnect battery negative (-) cable
from the battery.
2. Remove belt guard.
3. Check the seawater pump belt
(Figure 7, (1)) and alternator belt
(Figure 7, (2)) for wear, cracks or
damage.
4. Replace if necessary. See your
authorized Yanmar dealer or distributor.
5. Install belt guard and connect battery
negative (-) cable.
Zinc anodes are located in the heat
exchanger (Figure 8, (1)) and the charge
air cooler (Figure 8, (2)). An additional zinc
anode may also be located in the exhaust /
water mixing elbow.
1. Disconnect battery negative (-) cable.
2. Remove each anode and inspect for
corrosion. Any anode having less than
half its original size remaining should be
replaced.
NOTICE: NEVER use thread sealer or
thread sealing tape when installing zinc
anodes. Anodes must make good
metal-to-metal contact to perform
properly.
3. Install each anode using a new copper
gasket and tighten to 25 N·m (18 ft-lb).
4. Start engine and check for water leaks.
Checking or Replacing the Seawater
Pump Impeller
See your authorized Yanmar dealer or
distributor.
Replacing the Turbocharger Heat
Shield
See your authorized Yanmar dealer or
distributor.
BY Series Operation Manual
© 2008 Yanmar Marine International
53
PERIODIC MAINTENANCE
Checking Exhaust / Water Mixing
Elbow
See your authorized Yanmar dealer or
distributor.
Replacing Air Filter Element
1. Turn engine OFF.
2. Remove engine cover.
3. Remove clamp (Figure 9, (1)).
(1)
(2)
Checking Hydraulic Oil Cooler
See your authorized Yanmar dealer or
distributor.
Checking or Replacing Rubber
Hoses
Check rubber water and fuel hoses for wear
or damage. See your authorized Yanmar
dealer or distributor for replacement.
Checking or Replacing Flexible
Engine Mounts
Check the flexible engine mounts for wear
or damage. See your authorized Yanmar
dealer or distributor for replacement.
0006570
Figure 9
4. Remove air filter (Figure 9, (2)).
5. Replace air filter.
Cleaning the Turbocharger Blower
See your authorized Yanmar dealer or
distributor.
Checking or Replacing Alternator
Belt
See Checking or Replacing the Seawater
Pump and Alternator Belts on page 53.
Changing Power Steering Fluid
See your authorized Yanmar dealer or
distributor.
Checking Shift Cable Adjustment
See Checking Shift Cable Adjustment on
page 49.
Adjusting the Propeller Shaft
Alignment
See Adjusting Propeller Shaft Alignment (If
Equipped with Marine Gear) on page 49.
54
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
Every 500 Hours of Operation
Perform the following maintenance every
500 hours of operation or every 2 years,
whichever comes first.
• Checking the Fuel Pump and Fuel
Lines
• Draining and Refilling Closed Cooling
System (Engine Coolant)
Checking the Fuel Pump and Fuel
Lines
See your authorized Yanmar dealer or
distributor.
Note: The charge air cooler has been
removed for clarity of Figure 10.
5. WARNING! NEVER remove the
coolant filler cap if the engine is hot.
Steam and hot engine coolant will
escape and seriously burn you.
Allow the engine to cool before
attempting to remove the filler cap.
Remove drain plug (Figure 10, (1))
from the engine block. Allow coolant to
drain into a container of appropriate
size.
(1)
Draining and Refilling Closed
Cooling System (Engine Coolant)
1. Disconnect battery negative (-) cable.
2. Remove the engine cover.
3. Remove the coolant pressure cap from
heat exchanger.
4. Remove the heat exchanger to access
the cylinder block drain plug behind it.
0003660
Figure 10
6. Install cylinder block drain plug with a
new gasket.
7. Install heat exchanger. Ensure the drain
cock (Figure 11, (1)) on the heat
exchanger is closed.
(1)
(2)
0006621
Figure 11
BY Series Operation Manual
© 2008 Yanmar Marine International
55
PERIODIC MAINTENANCE
8. Remove the pressure cap
(Figure 11, (2)) from the heat
exchanger.
9. Inspect the cap gasket and flange on the
filler neck for damage. Replace if
necessary.
10. Check the rubber hose connecting the
coolant recovery tank to the heat
exchanger. Be sure the hose is securely
connected and there is no damage.
11. Fill the heat exchanger and recovery
tank with approved coolant mix.See
Adding Engine Coolant on page 32.
56
Every 1000 Hours of Operation
Perform the following maintenance every
1000 hours of operation or every 4 years,
whichever comes first.
• Checking Flexible Engine Mounts
Checking Flexible Engine Mounts
Check flexible engine mounts for damage,
cracks or wear. See your authorized Yanmar
marine dealer or distributor for replacement.
BY Series Operation Manual
© 2008 Yanmar Marine International
PERIODIC MAINTENANCE
Every 2000 Hours of Operation
Perform the following maintenance every
2000 hours of operation or every 8 years,
whichever comes first.
• Replacing Seawater Pump Impeller
• Replacing Alternator Belt
Replacing Seawater Pump Impeller
See your authorized Yanmar marine dealer
or distributor for replacement.
Replacing Alternator Belt
See your authorized Yanmar marine dealer
or distributor for replacement.
BY Series Operation Manual
© 2008 Yanmar Marine International
57
PERIODIC MAINTENANCE
This Page Intentionally Left Blank
58
BY Series Operation Manual
© 2008 Yanmar Marine International
TROUBLESHOOTING
If a problem occurs, stop the engine
immediately. Refer to the
Problem / Symptom column in the
Troubleshooting Chart to identify the
problem.
TROUBLESHOOTING
INFORMATION
If your engine does not operate properly,
refer to the troubleshooting chart or see your
authorized Yanmar marine dealer or
distributor.
Provide the authorized Yanmar marine
dealer or distributor with the following
information:
• Model name and serial number of your
engine
• Boat name, hull material, size
• Use and type of boating
• Total number of operation hours (refer to
hourmeter), age of boat
• Operating conditions when the problem
occurred:
- Engine rpm
- Color of exhaust smoke
- Type of diesel fuel
- Type of engine oil
- Any abnormal noises or vibration
• Operating environment such as high
altitude or extreme ambient temperatures,
etc.
• Engine maintenance history and previous
problems
• Other factors that contribute to the
problem
BY Series Operation Manual
© 2008 Yanmar Marine International
59
TROUBLESHOOTING
TROUBLESHOOTING CHART
Starting Trouble
Problem / Symptom
Cause
Action
Engine Will Not Crank
Discharged battery
Charge / replace battery
Blown fuse
Replace fuse
Defective starter motor
See your authorized Yanmar dealer
or distributor
Loose wiring connections
Tighten connections
Electrical panel power circuit
breaker is tripped
Reset circuit breaker
No fuel to engine
Check fuel level in tank
Engine Cranks but Will Not Start
See your authorized Yanmar dealer
or distributor
No fuel to cylinders
Check fuel filter / water separator
Clean or replace clogged fuel fine
filter
Bleed air from fuel system
Replace blown fuse (F3)
See your authorized Yanmar dealer
or distributor
60
Low ambient temperature
See your authorized Yanmar dealer
or distributor
Oil high
Replace with correct viscosity oil for
operating conditions
BY Series Operation Manual
© 2008 Yanmar Marine International
TROUBLESHOOTING
Exhaust Color
Problem / Symptom
Cause
Action
White Smoke
Cold engine
Allow engine to warm to operating
temperature
See your authorized Yanmar dealer or distributor
Incorrect fuel
Replace fuel with correct type
Defective (leaking) fuel injector
See your authorized Yanmar dealer or distributor
Injection timing is incorrect
White Smoke with Water Vapor
Leaking cylinder head gasket
Leaking charge air cooler
See your authorized Yanmar dealer or distributor
Cracked cylinder head
Cracked cylinder
Blue Smoke
Worn piston rings / cylinders
Oil leak in turbocharger (oil
present in intake manifold)
See your authorized Yanmar dealer or distributor
Damaged piston cooling nozzles
Black Smoke Under Load
Clogged intake air filter
Replace or clean as necessary
Incorrect valve timing
See your authorized Yanmar dealer or distributor
Defective (leaking) fuel injector
Low charge air pressure
Clean or replace clogged air filter
See your authorized Yanmar dealer or distributor
Excessive exhaust back pressure
See your authorized Yanmar dealer or distributor
Plugged intake port(s)
See your authorized Yanmar dealer or distributor
Vibration - Drive Disengaged
Problem / Symptom
Cause
Action
Rough at All Engine Speeds
Air in fuel system
Bleed fuel system
Faulty fuel injector
See your authorized Yanmar dealer or distributor
Leaking cylinder head gasket
Damaged intake or exhaust valves
Incorrect injection pressure
BY Series Operation Manual
© 2008 Yanmar Marine International
61
TROUBLESHOOTING
Vibration - Drive Engaged
Problem / Symptom
Cause
Action
Rough at All Speeds
Engine and propeller shaft misaligned
See your authorized Yanmar dealer or distributor
Leaking cylinder head gasket
Bent propeller shaft
Rough at Higher Speeds
Bent propeller
See your authorized Yanmar dealer or distributor
Slipping clutch / clutch dog
Incorrect injection pressure
Injection timing is incorrect
Engine Knocks
Problem / Symptom
Cause
Action
Excess Fuel Injected
Defective fuel injector
See your authorized Yanmar dealer
or distributor
High fuel injection pressure
Noise Changes with Engine Load
Incorrect or poor quality fuel
Drain and refill tank with proper fuel
Worn crankshaft / bearings
See your authorized Yanmar dealer
or distributor
Broken piston / rings
Low Power Output
Problem / Symptom
Cause
Action
Miscellaneous
Clogged air filter
Replace air filter
Leaking cylinder head gasket
See your authorized Yanmar dealer or distributor
Damaged turbocharger
Incorrect propeller
Excessive exhaust back pressure
Fuel
Low Fuel Injection Pressure
Plugged fuel filter(s)
Replace as necessary
Faulty fuel supply pump
See your authorized Yanmar dealer or distributor
Defective fuel pressure regulator / sensor
See your authorized Yanmar dealer or distributor
Worn high-pressure fuel pump
Injection timing is incorrect
Low RPM at Wide Open Throttle
Propeller pitch too great
See your authorized Yanmar dealer or distributor
Engine overheated
Damaged turbocharger
62
BY Series Operation Manual
© 2008 Yanmar Marine International
TROUBLESHOOTING
Engine Overheat
Problem / Symptom
Cause
Action
Instrument Shows High Temperature
Clogged seawater inlet
Clean
Low coolant level
Fill with coolant / inspect for leaks
Clogged seawater filter (if equipped)
Clean
Clogged hydraulic cooler
See your authorized Yanmar dealer or
distributor
Seawater pump worn or damaged
Defective sensor / instrument
Defective thermostat
Damaged closed coolant pump
Combustion gas leakage (causes loss of coolant)
Seawater pump belt slips or
pump pulley loose on pump shaft
Clogged heat exchanger
Engine Runs Cold
Problem / Symptom
Cause
Action
Instrument Shows Low Temperature
Defective sensor / instrument
See your authorized Yanmar dealer or
distributor
Defective thermostat
Cabin heater or boiler too large
Coolant Loss
Problem / Symptom
Cause
Action
Repeated Low Coolant Level
Defective cylinder head gasket
(external leakage)
See your authorized Yanmar dealer or
distributor
External leakage at connection
Coolant Forced Out of Coolant Recovery Tank
Turbocharging pressure enters
cooling system via leaking
charge air cooler
See your authorized Yanmar dealer or
distributor
Defective cylinder head gasket
(internal leakage)
White Smoke when Engine
Hot Indicates Water Vapor
Crack in cylinder head (not
cracks between valve seats)
See your authorized Yanmar dealer or
distributor
Cracked cylinder wall
Leaking cylinder head gasket
BY Series Operation Manual
© 2008 Yanmar Marine International
63
TROUBLESHOOTING
DIAGNOSTIC TROUBLE
CODES
When certain faults occur, or when certain
limits have been exceeded, the engine ECU
may generate a “Check Engine” warning or
turn on a check engine light (if equipped).
Some of these faults may also generate a
DTC or Diagnostic Trouble Code and an
audible alarm. If a DTC is generated, the
engine ECU will store that code or codes for
reference. To read the DTC codes, a special
tool is used by the technician. The
technician then can use a list to more quickly
find the cause of the fault and correct it.
64
Some conditions will produce an alarm but
do not generate a trouble code. An example
is engine overheat (over 108°C) caused by
an obstructed seawater inlet. The overheat
alarm will sound and the engine torque will
be reduced to protect the engine, but no
code will be set.
Under some conditions, the warning alarm
will sound until the fault code is checked and
corrected. Under other conditions, the alarm
will be canceled if the engine is turned off
and then restarted.
For further information, please contact your
authorized Yanmar distributor or dealer.
BY Series Operation Manual
© 2008 Yanmar Marine International
TROUBLESHOOTING
Diagnostic Trouble Code Table
Code
Part or System
Mode
Run Or
Condition
Engine
Can
Start
Check
Engine
Alarm
No
Code
Coolant Temp
Under 0°C (32°F)
1000 rpm
yes
no
No
Code
Coolant Temp
Over 108°C (226°F)
reduce
yes
no
No
Code
Coolant Temp
Over 110°C (230°F)
reduce
yes
alarm
No
Code
Charge Air Temp
Over 110°C (230°F)
reduce
yes
no
No
Code
Boost Pressure
Reading
4BY2 - over 1.9 bar (27.5 psi)
(relative*) or 2.9 bar (42.0 psi)
(absolute**)
6BY2 - over 2.3 bar (33.3 psi)
(relative*) or 3.3 bar (42.9 psi)
(absolute**)
reduce
yes
alarm
No
Code
Fuel Temperature
Over 90°C (194°F)
reduce
yes
no
No
Code
Neutral Switch
Only in case of analog throttle
or in case of CAN-fault
(U0001), wrong configuration neutral position
no
no
alarm
P0001
Fuel Metering Unit
Not connected
reduce
yes
alarm
P0003
Fuel Metering Unit
Short circuit to Ground
no
no
alarm
P0004
Fuel Metering Unit
Short circuit to B+
reduce
yes
alarm
P0087
Rail Pressure Governor Deviation
Fuel rail pressure out of range
reduce or
shut off
depends
on fault
alarm
P0088
Rail Pressure Governor Deviation
Fuel rail pressure out of range
reduce or
shut off
depends
on fault
alarm
P0089
Rail Pressure Governor Deviation
Fuel rail pressure out of range
yes
yes
alarm
P0090
Fuel Pressure Control
Valve
Not connected
no
no
alarm
Rail Pressure Governor Deviation
Fuel rail pressure out of range
reduce
yes
alarm
P0091
Fuel Pressure Control
Valve
Short circuit to Ground
reduce
yes
alarm
P0092
Fuel Pressure Control
Valve
Short circuit to B+
no
no
alarm
P0112
Charge Air Temp
Over 125°C (257°F)
reduce
yes
alarm
Charge Air Temp
Sensor
Short circuit to B+
reduce
yes
alarm
Charge Air Temp
Under -20°C (-4°F)
reduce
yes
alarm
Charge Air Temp
Sensor
No connection / short circuit to
Ground
reduce
yes
alarm
P0117
Coolant Temp Sensor
Short circuit to B+
reduce
yes
alarm
P0118
Coolant Temp Sensor
No connection / short circuit to
Ground
reduce
yes
alarm
P0113
BY Series Operation Manual
© 2008 Yanmar Marine International
65
TROUBLESHOOTING
Code
Part or System
Mode
Run Or
Condition
Engine
Can
Start
Check
Engine
Alarm
P0122
Throttle Signal
Both throttle signals are missing / short circuit to Ground
1600
yes
alarm
Throttle Signal
Throttle signal 1 is missing /
short circuit to Ground
reduce
yes
alarm
Throttle Signal
Both throttle signals are short
circuited to B+
1600
yes
alarm
Throttle Signal
Throttle signal 1 short circuit to
B+
reduce
yes
alarm
P0182
Fuel Temperature
Sensor
Short circuit to B+
reduce
yes
alarm
P0183
Fuel Temperature
Sensor
No connection / short circuit to
Ground
reduce
yes
alarm
P0192
Fuel Rail Pressure
Sensor
Short circuit to Ground
reduce
yes
alarm
P0193
Fuel Rail Pressure
Sensor
No connection / short circuit
B+
reduce
yes
alarm
P0201
Injector No. 1
Open circuit / short circuit to
Ground
reduce
yes
alarm
P0202
Injector No. 2
Open circuit / short circuit to
Ground
reduce
yes
alarm
P0203
Injector No. 3
Open circuit / short circuit to
Ground
reduce
yes
alarm
P0204
Injector No. 4
Open circuit / short circuit to
Ground
reduce
yes
alarm
P0205
Injector No. 5
Open circuit / short circuit to
Ground
reduce
yes
alarm
P0206
Injector No. 6
Open circuit / short circuit to
Ground
reduce
yes
alarm
P0222
Throttle Signal
Both throttle signals are missing / short circuit to Ground
1600
yes
alarm
Throttle Signal
Throttle signal 2 is missing /
short circuit to Ground
reduce
yes
alarm
Throttle Signal
Both throttle signals are short
circuited to B+
1600
yes
alarm
Throttle Signal
Throttle signal 2 short circuited
to B+
reduce
yes
alarm
P0230
Fuel Feed Pump
Not connected
no
no
alarm
P0231
Fuel Feed Pump
Short circuit to Ground
reduce
yes
alarm
P0232
Fuel Feed Pump
Short circuit to B+
no
no
alarm
P0236
Boost Pressure
Plausibility check with APS
(ambient air pressure sensor)
fail
reduce
yes
alarm
P0237
Boost Pressure
Under 0.5 bar (7.3 psi) (absolute**)
reduce
yes
alarm
Boost Pressure Sensor
No connection / short circuit to
Ground
reduce
yes
alarm
P0123
P0223
66
BY Series Operation Manual
© 2008 Yanmar Marine International
TROUBLESHOOTING
Code
Part or System
Mode
Run Or
Condition
Engine
Can
Start
Check
Engine
Alarm
P0238
Boost Pressure
4 bar (58.0 psi) (absolute**)
reduce
yes
alarm
Boost Pressure Sensor
Short circuit to B+
reduce
yes
alarm
P0243
Turbocharger Positive Boost Pressure
Deviation
Leakage in the air routing (hole
in the charge air pipe)
yes
yes
alarm
P0261
Injector No. 1
Short circuit to B+
reduce
yes
alarm
P0264
Injector No. 2
Short circuit to B+
reduce
yes
alarm
P0267
Injector No. 3
Short circuit to B+
reduce
yes
alarm
P0270
Injector No. 4
Short circuit to B+
reduce
yes
alarm
P0273
Injector No. 5
Short circuit to B+
reduce
yes
alarm
P0276
Injector No. 6
Short circuit to B+
reduce
yes
alarm
P0299
Turbocharger negative boost pressure
deviation
Boost pressure actuator is
sticking defect waste gate
hose
yes
yes
alarm
P0344
Crankshaft Speed
Sensor
Disagreement between camshaft speed sensor and crankshaft speed sensor
no
no
alarm
P0380
Glow Control Relay
Actuator
Not connected, short circuit
yes
yes
alarm
P0562
System Voltage Low
-
yes
no
alarm
P0563
System Voltage High
-
yes
yes
alarm
P0602
Control Module Programming Error
(Hwemon)
Overvoltage / undervoltage
no
no
alarm
Shut Off Path
Control module programming
error
no
no
alarm
P0607
Injector Chip Fault
Injector control module performance
no
no
alarm
P0642
Sensor Supply Monitoring 1
Short circuit
reduce
yes
alarm
P0643
Sensor Supply Monitoring 1
Short circuit
reduce
yes
alarm
P0650
Check Engine Lamp
Not connected, short circuit
yes
yes
alarm
P0652
Sensor Supply Monitoring 2
Short circuit
reduce
yes
alarm
P0653
Sensor Supply Monitoring 3
Short circuit
reduce
yes
alarm
P0670
Glow Plug Control
Module
Failure, short circuit, over-current
yes
yes
alarm
P0671
Glow System - Glow
Spark No. 1
Not connected, short circuit
yes
yes
alarm
P0672
Glow System - Glow
Spark No. 2
Not connected, short circuit
yes
yes
alarm
P0673
Glow System - Glow
Spark No. 3
Not connected, short circuit
yes
yes
alarm
P0674
Glow System - Glow
Spark No. 4
Not connected, short circuit
yes
yes
alarm
BY Series Operation Manual
© 2008 Yanmar Marine International
67
TROUBLESHOOTING
Code
Part or System
Mode
Run Or
Condition
Engine
Can
Start
Check
Engine
Alarm
P0675
Glow System - Glow
Spark No. 5
Not connected, short circuit
yes
yes
alarm
P0676
Glow System - Glow
Spark No. 6
Not connected, short circuit
yes
yes
alarm
P0689
Main Relay
Power relay sense short circuit
low
no
no
alarm
P0690
Main Relay
Power relay sense short circuit
high
no
no
alarm
P2049
4BY2 - Injector Bank 1
Short circuit on high side to
Ground / B+
no
no
alarm
6BY2 - Injector Bank 1
Short circuit on high side to
Ground / B+
reduce
no
4BY2 - Injector Bank 2
Short circuit on high side to
Ground / B+
reduce
yes
6BY2 - Injector Bank 2
Short circuit on high side to
Ground / B+
reduce
yes
P2227
Atmospheric Pressure
Plausibility check with BPS
(boost pressure sensor) fail
yes
yes
alarm
P2228
Atmospheric Pressure
Short circuit low
yes
yes
alarm
P2229
Atmospheric Pressure
Short circuit high
yes
yes
alarm
P2614
Camshaft Speed
Sensor
No connection / short circuit
reduce
yes
alarm
P2617
Crankshaft Speed
Sensor
No connection / short circuit
no
no
alarm
U0001
CAN Throttle Signal
No signal
idle
yes
alarm
U0106
Glow Control Unit
No communication error
yes
yes
alarm
U0426
Immobilizer
Manipulation error
no
no
alarm
P2052
*
**
68
Relative value is the value read on a pressure gauge attached to the intake pipe.
Absolute is the value reported by the ECU and displayed at the helm digital display.
BY Series Operation Manual
© 2008 Yanmar Marine International
alarm
LONG-TERM STORAGE
If the engine is not to be used for an
extended period of time, special measures
should be taken to protect the coolant
system, fuel system and combustion
chambers from corrosion and the exterior
from rusting. It is recommended that you see
your authorized Yanmar marine dealer or
distributor to prepare the engine for longterm storage.
The engine can normally stand idle for up to
six months. If it remains unused for longer
than this, please contact your authorized
Yanmar marine dealer or distributor.
Winter Storage
Drain water from fuel tank and fuel filters
before and after extended storage.
To reduce the risk of condensation in the fuel
tank during winter storage, fill the tank with
fuel and treat with diesel fuel stabilizer.
PREPARE ENGINE FOR
LONG-TERM STORAGE
NOTICE: Do not drain closed cooling
system for long-term storage. Antifreeze
must be used to avoid freezing and
damaging of components. Antifreeze will
prevent rusting during long-term storage.
1. Change engine oil and filter.
2. Drain seawater cooling system. See
Draining the Seawater Cooling System
on page 70.
3. Wipe off any dust or oil from the outside
of the engine.
4. Drain fuel tank or fill the tank to prevent
condensation.
5. Grease the exposed areas and joints of
the remote control cables and the
bearings of the remote control handle.
6. Seal the intake silencer, exhaust pipe,
etc. to prevent moisture or
contamination from entering engine.
7. Completely drain bilge in hull bottom.
8. Waterproof the engine room to prevent
rain or seawater from entering.
9. Charge the battery once a month to
compensate for battery’s selfdischarge.
10. Remove key from key switch and cover
key switch with moisture cap (if
equipped).
BY Series Operation Manual
© 2008 Yanmar Marine International
69
LONG-TERM STORAGE
Draining the Seawater Cooling
System
CAUTION! DO NOT drain the coolant
system. A full coolant system will
prevent corrosion and frost damage.
CAUTION! If seawater is left inside of the
engine, it may freeze and damage parts
of the cooling system when the ambient
temperature is below 0°C (32°F).
NOTICE: If water fails to drain from any open
drain cock or port, remove the cock
completely and probe the opening with a
small piece of wire to loosen debris.
(2)
1. Open the lower seawater drain cock
(Figure 1, (3)) located in the piping
between the seawater pump and
hydraulic oil cooler. Allow to drain.
2. Open the drain cock (Figure 1, (4)) on
the bottom of the charge air cooler.
3. Remove the seawater pump cover. See
your authorized Yanmar dealer or
distributor.
4. Remove zinc anodes from the heat
exchanger (Figure 1, (2)) and charge
air cooler (Figure 1, (1)) and allow
water to drain from housings.
5. Inspect condition of zinc anodes. Install
anodes. See Replacing the Zinc
Anodes on page 53. NOTICE: Do not
use thread sealer or thread sealing tape
when installing zinc anodes. Anodes
must make good metal-to-metal contact
to perform properly.
6. Close all drain cocks.
(1)
(3)
(4)
0006575
Figure 1
WARNING! NEVER drain the seawater
cooling system if the engine is hot.
Steam and hot fluid will escape and
seriously burn you. Allow the engine to
cool before attempting to opening the
drain cocks.
70
BY Series Operation Manual
© 2008 Yanmar Marine International
SPECIFICATIONS
ENGINE SPECIFICATIONS
Engine Model
Application Design
4BY2-150 /
150Z
4BY2-180 /
180Z
6BY2-220 /
220Z
6BY2-260 /
260Z
Models numbers with no suffix letter are used in marine gear applications. Models having a “Z” suffix are used with stern drive.
Number of Cylinders
In-line 4
Type
In-line 6
15° inclined, water-cooled, dual overhead camshaft, 4-cycle diesel
Combustion System
Direct injection
Aspiration
Turbocharged with charge air cooler
Bore x Stroke
84 mm x 90 mm (3.307 in. x 3.543 in.)
Displacement
1.995 L (122 cu in.)
2.993 L (183 cu in.)
Firing Order*
1-3-4-2
1-5-3-6-2-4
Compression Ratio
16.5:1
16.5:1
Maximum Output at Crankshaft**
kW (metric hp) at 4000
rpm
110 kW (150 hp)
132 kW (180 hp)
162 kW (220 hp)
191 kW (260 hp)
Mean Pressure
1.66 MPa
(240.8 psi)
1.95 MPa
(287.2 psi)
1.62 MPa
(234.96 psi)
1.92 MPa
(278.47 psi)
Torque
320 N·m
(236 ft-lb)
360 N·m
(265 ft-lb)
500 N·m
(369 ft-lb)
550 N·m
(407 ft-lb)
Low Idle Speed (Warm Engine @ 88°C [190°F])
Cold Start Speed @ 20˚
°C (68°F)
750 rpm (ECU-controlled) ***
1200 rpm gradually decreasing to warm engine idle @ 88°C (190°F)
(ECU-controlled)
High Idle Speed
4600 rpm
Rotation Direction
Counterclockwise (viewed from flywheel)
No. of Valves per Cylinder
4
Valve Adjustment
Turbocharger
670 rpm (ECU-controlled) ***
Hydraulic self-adjusting
MHI with pneumatic wastegate
Charge Air Cooler
HOLSET with pneumatic wastegate
Seawater cooled
Electrical System
12 V
Starter
12 V / 2 kW (2.7 hp)
Charging System
12 V / 150 A
Battery Capacity - Recommended
12 V / 85 Ah / 680 CCA (cold cranking amps)
BY Series Operation Manual
© 2008 Yanmar Marine International
71
SPECIFICATIONS
Engine Model
Fuel Injection System
Fuel Injection Pressure
4BY2-150 /
150Z
4BY2-180 /
180Z
Common rail (ECU-controlled)
Variable (ECU controlled)
ECU Threshold Voltage
Coolant Capacity (Approximate)
6BY2-260 /
260Z
Variable depending on rpm; 250 - 1600 bar (3626 - 23,206 psi)
Injection Timing
Cooling System
6BY2-220 /
220Z
7.8 V
Closed cooling system with seawater heat exchanger
10 L (10.6 qt)
13 L (13.7 qt)
Seawater Pump
Rubber impeller, belt driven
Capacity
165 L/min at maximum rating
Maximum Lift
2000 mm (78.75 in.)
Hydraulic Oil Cooler
Seawater cooled
Lubrication System
Totally enclosed, forced lube system
Oil Cooler
Engine coolant system
Engine Oil Pressure at
4000 rpm
3.5 - 6.0 bar (51 - 87 psi)
Engine Oil Pressure at
1000 rpm
0.6 - 1.0 bar (8.7 - 14.5 psi)
Engine Oil Capacity****
8.0 L (8.5 qt)*****
Crankcase Ventilation
11.0 L (11.5 qt)*****
Closed, with filter
Drive Options
Stern Drive
Marine Gear
ZT350 or MerCruiser Bravo-1, -2, -3
KMH40 or KMH50
KMH50
Operational Angles
Continuous
Front-to-Rear: -5 to 20°, Side-to-Side: 20°
Peak
Front-to-Rear: -5 to 25°, Side-to-Side: 30°
Height
721 mm (28.4 in.)
Length (without marine gear)
Stern Drive (front-tomiddle of engine
mount)
Marine Gear (front-tomarine gear mounting
face)
Overall Length
Width
72
736.5 mm (30.0 in.)
942 mm (37.1 in.)
644 mm (25.4 in.)
827.5 mm (32.6in.)
839.2 mm (33.0 in.)
1001 mm (39.4 in.)
670 mm (26.4 in.) (local exceeding)
BY Series Operation Manual
© 2008 Yanmar Marine International
SPECIFICATIONS
Engine Model
4BY2-150 /
150Z
4BY2-180 /
180Z
6BY2-220 /
220Z
6BY2-260 /
260Z
Weight (without marine gear)
Dry (without mixing
elbow)
For Stern Drive: 273.5 kg (603 lb)
For Marine Gear: 262.5 kg (575.7 lb)
For Stern Drive: 338 kg (745 lb)
For Marine Gear: 319 kg (703 lb)
*
**
Cylinder numbering starts at the coolant pump end of the engine.
Rating condition: ISO 8665. Temperature of fuel:
40°C (104°F) at fuel pump inlet 1 hp (metric horsepower) = 0.7355 kW Fuel condition: Density at 15°C (59°F)
= 0.840 g/cm3 Fuel temperature at the inlet of the fuel injection pump
*** 1080 rpm at startup for alternator excitation
**** The “Total Engine Lubricating Oil Capacity” includes oil in the oil pan, channels, coolers, and filter. The “Effective
Engine Lubricating Capacity” indicates the difference in maximum scale of the dipstick and minimum scale.
***** Capacity may vary depending on installation angle.
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SPECIFICATIONS
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EPA WARRANTY
USA ONLY
YANMAR CO., LTD. LIMITED
EMISSION CONTROL
SYSTEM WARRANTY - USA
ONLY
The following EPA Warranty only applies to
engines built on or after January 01, 2006
and labeled with the proper nameplate.
THIS EMISSION WARRANTY APPLIES TO
THE ENGINES CERTIFIED TO UNITED
STATES EPA 40 CFR 94 AND SOLD BY
YANMAR THAT ARE INSTALLED IN
VESSELS FLAGGED OR REGISTERED IN
THE UNITED STATES.
Your Warranty Rights and
Obligations:
Yanmar warrants to the first user and each
subsequent purchaser the emission control
system on your engine for periods of time
listed below provided the engine has been
installed according to Yanmar installation
requirements and there has been no abuse,
neglect, or improper maintenance of your
Yanmar marine engine.
Yanmar warrants that the engine is
designed, built and tested using genuine
parts and equipped so as to conform to all
applicable emission requirements of the
U.S. Environmental Protection Agency and
is free from defects in material and
workmanship which would cause this
engine to fail to conform to the applicable
emission regulations over its limited
emission control system warranty period.
Where a warrantable emissions condition
exists, Yanmar will repair your engine at no
charge to you for diagnosis, parts, and labor.
Warranty service or repair will be provided
at authorized Yanmar marine dealers or
distributors.
It is recommended that any replacement
parts used for maintenance, repair or
replacement of emission control systems
are Yanmar parts. The owner may elect to
have maintenance, replacement or repair of
the emission control components and
systems performed by any repair
establishment or individual and may elect to
use parts other than Yanmar parts for such
maintenance, replacement or repair.
However, the cost of such service or parts
and subsequent failures from such service
or parts will not be covered under this
emission control system warranty:
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© 2008 Yanmar Marine International
75
EPA WARRANTY USA ONLY
Warranty Period:
The warranty starts on either the date of
delivery to the first end-user, or the date the
unit is first leased, rented, or loaned.
For Pleasure Use: The warranty period is
five (5) years or 2000 hours of use,
whichever occurs first. In the absence of a
device to measure hours of use, the engine
has a warranty period of five (5) years.
Warranty Coverage:
Repair or replacement of any warranted
parts will be performed at an authorized
Yanmar dealer or distributor. This limited
emission control system warranty covers
engine components that are a part of the
emission control system of the engine as
delivered by Yanmar to the original retail
purchaser. Such components may include
the following:
1.
2.
3.
4.
Owner’s Responsibility:
As the Yanmar marine engine owner, you
are responsible for the performance of the
required maintenance listed in your
Operation Manual. Yanmar recommends
that you retain all documentation, including
receipts, covering maintenance on your
marine engine, but Yanmar cannot deny
warranty solely for the lack of receipts or for
your failure to ensure the performance of all
scheduled maintenance.
Your engine is designed to operate on diesel
fuel only. Use of any other fuel may result in
your engine no longer operating in
compliance with applicable emission
requirements. You are responsible for
initiating the warranty process. You must
present your marine engine to an authorized
Yanmar dealer or distributor as soon as a
problem exists.
Fuel Injection System
Turbocharger System
Aftercooler
Electronic Engine Control Units and its
associated Sensor and Actuators
Exclusions:
Failures other than those arising from
defects in material and / or workmanship are
not covered by this limited emissions
warranty. This warranty does not extend to
the following: malfunction caused by abuse,
misuse, improper adjustment, modification,
alteration, tampering, disconnection,
improper or inadequate maintenance,
improper storage or use of nonrecommended fuels and lubricating oils,
accident-caused damage, and replacement
of expendable and / or consumable items
made in connection with scheduled
maintenance.
76
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© 2008 Yanmar Marine International
EPA WARRANTY USA ONLY
Customer Assistance:
If you have any questions regarding your
warranty rights and responsibilities or would
like information on the nearest authorized
Yanmar dealer or distributor, you should
contact Yanmar Marine USA Corporation for
assistance.
Yanmar Marine USA Corporation
101 International Parkway
Adairsville, GA 30103
USA Telephone: 770-877-9894
Fax: 770-877-7567
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© 2008 Yanmar Marine International
77
EPA WARRANTY USA ONLY
Maintenance Log
Date
78
Operating
Hours
Maintenance Performed
Dealer Name
Stamp or Signature
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© 2008 Yanmar Marine International
EPA WARRANTY USA ONLY
Date
Operating
Hours
Maintenance Performed
BY Series Operation Manual
© 2008 Yanmar Marine International
Dealer Name
Stamp or Signature
79
EPA WARRANTY USA ONLY
80
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EPA WARRANTY USA ONLY
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EPA WARRANTY USA ONLY
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