11B-0-1
ENGINE
4M41
CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-0-3
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-1-1
SERVICE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-1-1
TORQUE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-1-4
SEALANT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-1-8
2. SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-2-1
3. GENERATOR ASSEMBLY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-3-1
4. GLOW PLUG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-4-1
5. COOLING FAN, V-BELT AND WATER PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-5-1
6. WATER HOSES AND PIPES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-6-1
7. THERMOSTAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-7-1
8. EGR VALVE ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-8-1
9. INTAKE MANIFOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-9-1
10. TURBOCHARGER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-10-1
11. EXHAUST MANIFOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-11-1
12. INJECTION PUMP ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-12-1
13. INJECTION PUMP GEAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-13-1
14. ROCKER COVER, CAMSHAFT HOLDER ASSEMBLY AND CAMSHAFT . . . . 11B-14-1
15. INJECTION NOZZLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-15-1
16. CYLINDER HEAD AND VALVE MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-16-1
17. VACUUM PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-17-1
18. TIMING GEAR CASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-18-1
19. TIMING GEAR AND BALANCE SHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-19-1
20. OIL PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-20-1
21. OIL COOLER AND OIL FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-21-1
22. OIL PAN, OIL STRAINER AND OIL JET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-22-1
23. PISTON AND CONNECTING ROD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-23-1
24. DRIVE PLATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-24-1
25. CRANK SHAFT AND CRANK CASE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-25-1
26. BALANCE SHAFT BUSH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11B-26-1
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-0-2
NOTES
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - General Information
11B-0-3
GENERAL INFORMATION
Descriptions
Specifications
Total displacement dm3
3200
No. and arrangement of cylinders
4 in-line
Combustion chamber
Direct injection
No. of intake/exhaust valves (per cylinder)
2 each
Valve mechanism
Double overhead camshaft, 4-valve
Cylinder bore x stroke mm
98.5 x 105
Compression ratio
17
Supercharger
Turbo-charging type
Intercooler
Air-cooling type
Fuel supply
Distributor type electronically controlled fuel injection pump
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-1-1
4M41 ENGINE - Specifications
1. SPECIFICATIONS
SERVICE SPECIFICATIONS
Unit: mm
Descriptions
Standard
Limit
1.1
-
161
-
0.10 - 0.18
0.3
Front
6.16
6.11
Rear
6.10
6.05
Front
5.91
5.86
Rear
6.16
6.11
Bend
Less than 0.015
0.03
Journal oil clearance
0.05 - 0.09
0.15
Rocker roller radial play
0.03 - 0.07
-
Injection pressure
(valve opening
pressure)
No. 1 valve opening pressure
MPa
17.60 - 18.58
-
No. 2 valve opening pressure
MPa
22.6 - 23.6
-
Pre-lift
0.05 - 0.07
-
Needle valve lift
0.23 - 0.28
-
Free height
51.3
-
Load (installed height: 39.5) N
255
-
Out-of-squareness
2_
4_
Stem diameter
6.560 - 6.575
6.45
Sinkage from cylinder head
bottom
0.05 - 0.55
0.8
Margin
1.0
0.8
Valve seat angle
45_ ± 15’
-
Stem diameter
6.53 - 6.55
6.45
Sinkage from cylinder head
bottom
0.05 - 0.55
0.8
Margin
1.0
0.8
Valve seat angle
45_ ± 15’
-
Intake
0.02 - 0.06
0.10
Exhaust
0.05 - 0.09
0.15
Glow plug
Glow plug
Resistance W
Turbocharger assembly
Turbocharger
Actuator operating pressure
(when operating 1 mm)
kPa
Rocker cover, camshaft holder assembly, camshaft assembly
Camshaft
End play
Cam lobe lift
Intake
Exhaust
Rocker
Injection nozzle
Injection nozzle
Cylinder head and valve mechanism
Valve spring
Valve
Intake
Exhaust
Valve guide
E Mitsubishi Motors Corporation
Stem-to-guide clearance
Feb. 2000
PWEE9409-D
Added
11B-1-2
4M41 ENGINE - Specifications
Descriptions
Standard
Limit
Valve seat
Seat width
1.8 - 2.2
2.8
Cylinder head
Bottom surface distortion
Less than 0.05
0.2
Performance
Attained degree of vacuum
93 kPa or more
-
Pump speed
1500 r/min
-
Balance shaft gear RH and oil pump gear
0.04 - 0.19
0.3
Oil pump gear and crankshaft gear
0.04 - 0.18
0.3
Crankshaft gear and idler gear
0.04 - 0.18
0.3
Idler gear and idler gear LH
0.04 - 0.19
0.3
Idler gear LH and balance shaft gear LH
0.04 - 0.22
0.4
Idler gear and injection pump gear
0.04 - 0.21
0.4
Balance shaft LH, RH
0.09 - 0.24
0.3
Idler gear/sprocket assembly
0.05 - 0.20
0.3
Idler gear LH assembly
0.05 - 0.20
0.3
Timing chain elongation (minimum distance between chain spans facing each
other when pressing on tensioner lever)
16.5
9
Tension lever-to-tension lever shaft clearance
0.06 - 0.18
0.3
Idler gear bush LH-to-idler shaft clearance
0.02 - 0.05
0.1
Idler sprocket bush-to-idler shaft clearance
0.02 - 0.06
0.1
Driven gear shaft-to-oil pump case and cover
clearance
0.03 - 0.05
0.15
Side clearance
0.05 - 0.10
0.15
Tip clearance
0.15 - 0.26
0.27
Vacuum pump
Vacuum pump
Timing gears and balance shafts
Backlash between gears
End play
Oil pump
Oil pump
Oil cooler and oil filter
Bypass valve spring
Valve opening pressure
kPa
490 ± 30
-
Regulator valve spring
Valve opening pressure
kPa
620 ± 30
-
Piston and connecting rod assembly
Piston
Protrusion
- 0.20 - - 0.30
-
Piston pin
Piston pin-to-connecting rod bush clearance
0.03 - 0.05
0.1
Piston pin-to-piston clearance
0.007 - 0.021
0.05
Ring-to-ring
groove clearance
No.1 compression ring
0.03 - 0.08
0.15
No.2 compression ring
0.07 - 0.10
0.15
Oil ring
0.03 - 0.06
0.15
No.1 compression ring
0.3 - 0.45
0.8
No.2 compression ring
0.4 - 0.55
0.8
Oil ring
0.3 - 0.5
0.8
Piston ring
End gap
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-1-3
4M41 ENGINE - Specifications
Descriptions
Connecting rod
Connecting rod bearing
Standard
Limit
End play
0.15 - 0.45
0.6
Bend
-
0.05
Twist
-
0.1
Oil clearance
0.03 - 0.05
0.1
Free span
-
58.8 max.
End play
0.10 - 0.28
0.4
Bend
Less than 0.02
0.05
Out-of-roundness
Less than 0.01
-
Conicity
Less than 0.006
-
No.1, 2, 4 and 5 journal
0.04 - 0.06
0.1
No.3 journal
0.06 - 0.08
0.1
Free span
-
73.16 max.
Upper surface distortion
Less than 0.05
0.1
Cylinder I.D.
98.5 - 98.53
98.75
Piston and connecting rod assembly-to-upper
crankcase cylinder clearance
0.04 - 0.05
-
Clearance between balance shaft and balance shaft
bush
0.06 - 0.11
0.16
Crankshaft and crankcase
Crankshaft
Pin and journal
Main bearing
Upper crankcase
Main bearing-tocrankshaft clearance
Balance shaft bush
Balance shaft
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-1-4
4M41 ENGINE - Specifications
TORQUE SPECIFICATIONS
Items
Torque Nm
Glow plug
Connection plate
1.3 ± 1
Glow plug
18 ± 1
Cooling fan V-belt and water pump
Cooling fan bolt
10 ± 1
Auto-cooling fan coupling nut
24 ± 2
Water pump bolt
24 ± 2
Water hoses and pipes
Eyebolt
25 ± 2
Coolant temperature sensor
9±1
Intake manifold
Boost air temperature sensor
15 ± 1
Gas filter assembly
17 ± 1
Turbocharger assembly
Eye bolt (for oil pipe)
20 ± 2
Eye bolt (for water pipe)
25 ± 2
Coupler nut
49 ± 4
Turbocharger nut
49 ± 4
Turbocharger bolt
54 ± 5
Exhaust manifold
Exhaust manifold nut
30 ± 3
Injection pump assembly
Injection pipe
25 ± 2
Pump stay mounting bolt
18 ± 2
Injection pump
Injection pump gear mounting nut
180 ± 10
Sensor plate mounting bolt
5±1
Flange plate mounting nut
38 ± 2
Engine speed sensor mounting bolt
5±1
Rocker cover, camshaft holder assembly, camshaft assembly
Rocker cover mounting bolt
Fuel leak-off pipe eyebolt
3.0 ± 0.3
Injection nozzle side
13 ± 2
Cylinder head side
11 ± 1
Cam sprocket mounting bolt
88 ± 10
Camshaft cap mounting bolt
20 ± 1
Adjust screw locknut
9.5 ± 0.5
Pivot bolt
38 ± 8
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Specifications
Items
11B-1-5
Torque Nm
Injection nozzle
Injection pipe
33 ± 3
Return pipe eyebolt
11 ± 1
Injection nozzle assembly eyebolt
13 ± 2
Leak-off pipe eye bolt
11 ± 1
Injection nozzle assembly mounting bolt
21 ± 2
Retaining nut
34 ± 5
Cylinder head and valve mechanism
Injection nozzle mounting bolt
21 ± 2
Connecting plate mounting nut
1.3 ± 1.0
Glow plug
18 ± 2
Bolt (M10)
58 ± 6
Cylinder head bolt (M12: long)
49 ± 5 + 90_ + 90_
Cylinder head bolt (M12: short)
49 ± 5 + 90_ + 90_
Water joint
47 ± 5
Vacuum pump
Eyebolt
20 ± 2
Cover and body assembly mounting bolt
5.4 ± 0.5
Timing gear case
Crankshaft pulley mounting bolt
323 ± 32
Cap nut
23 ± 2
Timing gear and balance shaft
Tension lever shaft mounting bolt
40 ± 4
Guide plate mounting bolt
33 ± 3
Balance shaft gear RH mounting bolt
36 ± 4
Thrust plate mounting bolt
12 ± 1
Balance shaft gear LH mounting bolt
36 ± 4
Oil Pump
Balance shaft RH bolt
36 ± 3
Plug
44 ± 4
Oil pump cover screw
10 ± 1
Oil cooler and oil filter
Oil cooler element nut
20 ± 2
Bypass plug
44 ± 4
Regulator plug
44 ± 4
Water drain plug
30 ± 3
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-1-6
4M41 ENGINE - Specifications
Items
Torque Nm
Oil pan, oil strainer and oil jet
Drain plug
39 ± 3
Oil jet
32 ± 3
Piston and connecting rod
Connecting rod cap mounting nut
29 ± 3 + 49 ± 5 + 45_ + 45_
Drive plate
Drive plate assembly and crankshaft mounting bolt
123 ± 12
Crankshaft and crankcase
Dust cover mounting bolt
47 ± 5
Lower crankcase mounting bolt
25 ± 3
Main bearing cap bolt
20 ± 2 + 90_ + 90_
Check valve
32 ± 3
STANDARD BOLT AND NUT TIGHTENING TORQUE TABLE
1. Fasten the parts and equipment of vehicle using the specified standard bolts and nuts. Tighten these
bolts and nuts to the torques indicated below, unless otherwise specified.
2. Threads and bearing surfaces must be dry.
3. In case nut and bolt (or stud bolt) differ in strength, tighten them to the torque specified for the
bolt.
Hexagon head bolts and stud bolts
Strength
Code
4T
Unit: Nm
7T
8T
Head Mark
Nominal
Diameter mm
(Stud)
(Stud)
(Stud)
M5
2.5 ± 0.5
-
5±1
-
6±1
-
M6
5±1
-
9±2
-
10 ± 2
-
M8
11.5 ± 2.5
-
21 ± 4
-
25 ± 4
-
M10
23 ± 4
22 ± 4
44 ± 10
41 ± 8
52 ± 7
55 ± 13
M12
41 ± 8
38 ± 8
81 ± 12
74 ± 9
96 ± 12
86 ± 12
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-1-7
4M41 ENGINE - Specifications
Hexagon flange bolts
Strength
Code
Unit: Nm
4T
7T
8T
Head Mark
Nominal
Diameter mm
M6
5±1
-
10 ± 2
-
12 ± 2
-
M8
13 ± 2
-
23 ± 4
-
27 ± 5
-
M10
26 ± 4
22 ± 4
49 ± 10
44 ± 9
57 ± 7
54 ± 10
M12
46 ± 8
42 ± 9
93 ± 15
81 ± 12
103 ± 15
96 ± 12
Hexagon nuts
Strength Code
Unit: Nm
4T
6T
Head Mark
Nominal
Diameter mm
Standard
Thread
Coarse Thread
Standard Thread
Coarse Thread
M5
2.5 ± 0.5
-
5±1
-
M6
5±1
-
9±2
-
M8
12 ± 2
-
21 ± 4
-
M10
23 ± 4
22 ± 4
44 ± 10
41 ± 8
M12
41 ± 8
38 ± 8
81 ± 12
73 ± 10
Hexagon flange nuts
Strength Code
Unit: Nm
4T
Head Mark
Nominal
Diameter mm
Standard
Thread
Coarse Thread
M6
5±1
-
M8
13 ± 2
-
M10
26 ± 4
24 ± 4
M12
41 ± 8
42 ± 9
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-1-8
4M41 ENGINE - Specifications
SEALANT
Location
Specified sealant
Mating surface of front plate to cylinder head gasket
3M ATD Part No.8660 or equivalent
Inner surface of sealing cap press-fitting hole
THREEBOND TB1386, LOCTITE 962T or equivalent
Mating surface of timing gear case to front plate*
Mitsubishi Genuine Part No. MD970389 or equivalent
Upper crankcase assembly-to-lower crankcase assembly mounting surface*
Rear oil seal case-to-upper or lower crankcase assembly
mounting surface*
Upper or lower crankcase assembly-to-front plate
mounting surface*
*: FIPG to be applied
FORM-IN-PLACE GASKET
The engine has several areas where the form-in-place gasket (FIPG) is in use. To ensure that the gasket
fully serves its purpose, it is necessary to observe some precautions when applying the gasket. Bead
size, continuity and location are of paramount importance.
Too thin a bead could cause leaks. Too thick a bead, on the other hand, could be squeezed out of
location, causing blocking or narrowing of the fluid feed line. To eliminate the possibility of leaks from
a joint, therefore, it is absolutely necessary to apply the gasket evenly without a break, while observing
the correct bead size.
Since the FIPG used in the engine hardens as it reacts with the moisture in the atmospheric air, it is
normally used in the metallic flange areas.
Disassembly
The parts assembled with the FIPG can be easily disassembled without use of a special method. In
some cases, however, the sealant between the joined surfaces may have to be broken by lightly striking
with a mallet or similar tool. A flat gasket scraper may be lightly hammered in between the joined surfaces.
In this case, however, care must be taken to prevent damage to the joined surfaces.
Surface Preparation
Thoroughly remove all substances deposited on the gasket application surfaces, using a gasket scraper
or wire brush. Check to ensure that the surfaces to which the FIPG is to be applied is flat. Make sure
that there are no oils, greases and foreign substances deposited on the application surfaces. Do not
forget to remove the old sealant remaining in the bolt holes.
Form-In-Place Gasket Application
Applied FIPG bead should be of the specified size and without breaks. Also be sure to encircle the
bolt hole circumference with a completely continuous bead. The FIPG can be wiped away unless it is
hardened. While the FIPG is still moist (in less than 15 minutes), mount the parts in position. When
the parts are mounted, make sure that the gasket is applied to the required area only. In addition, do
not apply any oil or water to the sealing locations or start the engine until a sufficient amount of time
(about one hour) has passed after installation is completed.
The FIPG application procedure may vary on different areas. Observe the procedure described in the
text when applying the FIPG.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Special Tools
11B-2-1
2. SPECIAL TOOLS
Tool
A
B
B
C
A
Number
Name
Use
MB990767
Front hub and
flange yoke holder
D
D
MD998754
Crankshaft pulley
holder pin
157944-9520
(Zexel)
Plate
Removal and installation of retaining nut
105789-0010
(Zexel)
Nozzle cleaning
tool
Cleaning of nozzle and needle valve
157892-4420
Adjusting device
D
D
D
157892-4400: A
Holder
157892-1000: B
Nut
157954-3801
Dial gauge
157892-7200
Pin
157892-5120
Retaining nut
157892-5100: A
Retaining nut
026508-1140: B
Gasket
157892-1600: C
Plug
157892-3200
E Mitsubishi Motors Corporation
Feb. 2000
Removal of crankshaft puley
Installation of injection pump assembly
Adjustment of valve opening pressure
Checking needle valve maximum lift
Checking injection nozzle assembly
Gasket
PWEE9409-D
Added
11B-2-2
4M41 ENGINE - Special Tools
Tool
f11.5
Number
Name
Use
MH063490
Cam sprocket
holder kit
Holding cam sprocket
MD998772
Valve spring compressor
Removal and installation of valve cotter
MD998784
Valve spring compressor adaptor
plate
MD999597
Valve spring compressor
MD998665
Valve guide remover
Removal of valve guide
MH063611: A
Calking ring inlet
Installation of valve seat
MH063612: B
Calking ring exhaust
MH063613: C
Calking tool body
MH063610
Valve guide installer
f6.6
C
f8
A, B
f35: A
f33: B
f12
Installation of valve guide
f21
16.5
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Special Tools
Tool
f18
f6.6
11B-2-3
Number
Name
Use
MH063609
Valve stem seal
installer
Installation of valve stem seal
MH062463
Idler gear
puller
bush
Removal and installation of idler gear bush
MH062462
Idler sprocket bush
puller
Removal and installation of idler sprocket
bush
MH060014
Piston ring tool
Removal and installation of piston rings
MH062574
Connecting rod
bush puller kit
Removal of connecting rod bush
MH063484
Piston guide
Installation of piston
MH062469
Gear puller
Removal of crankshaft gear
MH062490
Balance shaft bush
remover
Removal of balance shaft bush
MH062717
Balance shaft bush
installer
f15.4
f27.5
f32
f41.5
f46
f28
f42
f60 - 120
f98.5
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-2-4
Tool
E Mitsubishi Motors Corporation
4M41 ENGINE - Special Tools
Number
Name
Use
MH062567
Gear puller
Removal of injection pump gear
MH063473
Pin wrench arm
assembly
Assembling of injection pump gear
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Generator Assembly
11B-3-1
3. GENERATOR ASSEMBLY
REMOVAL AND INSTALLATION
1
2
4
5
3
Removal steps
1. Wiring harness
2. Adjusting bolt
3. Bolt
4. V-belt (Refer to page 11B-5-1.)
"AA 5. Generator
REMOVAL SERVICE POINT
"AA GENERATOR INSPECTION
Caution in Handling Generator
The following caution should be taken when servicing the
generator 5.
Be sure to connect the generator 5 to the battery correctly.
Reversed polarity causes an excessive current to flow from
the battery to the generator 5, damaging the diodes and
voltage regulator.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-4-1
4M41 ENGINE - Glow Plug
4. GLOW PLUG
REMOVAL AND INSTALLATION
13 ± 1 Nm
18 ± 1 Nm
3
7
1
4
5
2
6
Removal steps
1. Nut
2. Glow plug wiring harness
3. Connection plate
4. Glow plug
5. Coolant temperature sensor
(For engine control)
6. Glow relay
7. Engine ECU
INSPECTION
GLOW PLUG
Measure resistance of the glow plug 4. Replace the glow
plug if the reading deviates from the specified standard value.
Standard value: 1.1 W
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-5-1
4M41 ENGINE - Cooling Fan, V-belt and Water Pump
5. COOLING FAN, V-BELT AND WATER PUMP
REMOVAL AND INSTALLATION
8
5
24 ± 2 Nm
2
4
7
*1
6
9
10
3
24 ± 2 Nm
1
10 ± 1 Nm
Removal steps
1. Bolt
2. Cooling fan
3. Nut
4. Auto-cooling fan coupling
5. V-belt
6. Bolt
7. Coupling plate
8. Water pump pulley
9. Water pump assembly
10. O-ring
*1: Timing gear case
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-5-2
4M41 ENGINE - Cooling Fan, V-belt and Water Pump
INSPECTION
1. AUTO-COOLING FAN COUPLING
Check the auto-cooling fan coupling 4, and replace if
any of the following conditions exists:
(1) Hydraulic fluid is leaking from the hermetically sealed
housing.
(2) The coupling turns irregularly or produces an
abnormal sound when rotated by hand due to
defective inside bearing.
(3) The coupling has an excessive axial play when moved
with the engine in a cold state.
2. V-BELT
(1) Push the V-belt 5 at its midpoint with a force of
approximately 98 N as shown and read the amount of
deflection A.
(2) If the reading deviates from the specified standard value,
accomplish the following adjustment.
5
A
C
(3) Loosen the bolt and nut B holding the generator, and
adjust the tension of the V-belt 5 using the adjusting
bolt C.
B
Caution
1. Be sure to retighten the bolt and nut securely
after the adjustment.
2. Excessive tension damages not only the V-belt
5 itself but bearings elsewhere.
3. Be sure to replace the V-belt 5, when necessary,
in pairs and keep it slush-free.
B
CLEANING
Remove foreign matters, if any, from the bimetal A using
care not to apply unnecessary force to it.
A
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-6-1
4M41 ENGINE - Water Hoses and Pipes
6. WATER HOSES AND PIPES
REMOVAL AND INSTALLATION
3
4
8
6
2
25 ± 2 Nm
5
25 ± 2 Nm
1
7
9 ± 1 Nm
25 ± 2 Nm
Removal steps
1. Turbocharger water outlet pipe
2. Turbocharger water inlet pipe
3. Heater return pipe
"AA 4. O-ring
5. Harness
6. Coolant temperature sensor
(For water temperature gauge)
7. Water outlet pipe
8. Gasket
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-6-2
4M41 ENGINE - Water Hoses and Pipes
INSTALLATION SERVICE POINTS
"AA O-RING INSTALLATION
Caution
Engine oil swells O-rings. When installing the O-rings
4, be sure that they are free of engine oil.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-7-1
4M41 ENGINE - Thermostat
7. THERMOSTAT
REMOVAL AND INSTALLATION
3
4
5
2
6
1
Removal steps
1. Thermostat cover
"BA 2. Thermostat
3. Bypass pipe
"AA 4. O-ring
5. Thermostat case
"AA 6. O-ring
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-7-2
4M41 ENGINE - Thermostat
INSTALLATION SERVICE POINTS
"AA O-RING INSTALLATION
Caution
Engine oil swells O-rings. When installing the O-rings
4 and 6, be sure that they are free of engine oil.
"BA THERMOSTAT INSTALLATION
Install the thermostat 2 with its jiggle valve A located at the
uppermost position.
5
A
2
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-8-1
4M41 ENGINE - EGR Valve Assembly
8. EGR VALVE ASSEMBLY
REMOVAL AND INSTALLATION
*a
5
4
2
1
2
3
8
6
10
7
9
*b
8
Removal steps
1. EGR pipe
2. Gasket
3. EGR pipe stay
4. EGR valve
5. Gasket
6. Insulator
7. EGR pipe
E Mitsubishi Motors Corporation
Feb. 2000
8. Gasket
9. EGR box
10. EGR box bracket
*a: Intake manifold
*b: Exhaust manifold
PWEE9409-D
Added
11B-9-1
4M41 ENGINE - Intake Manifold
9. INTAKE MANIFOLD
REMOVAL AND INSTALLATION
*b
18
*a
3
17 ± 1 Nm
2
12
11
3
10
16
13
17
9
8
15 ± 1 Nm
1
15 14
5
7
4
6
Removal steps
1. Side cover
2. EGR valve
3. Gasket
4. Boost air temperature sensor
5. Gasket
6. Air inlet fitting
7. O-ring
8. Throttle body assembly
9. O-ring
10. Boost pressure sensor
11. Boost hose
E Mitsubishi Motors Corporation
Feb. 2000
12.
13.
14.
15.
16.
17.
"AA 18.
Gas filter assembly
Rubber spacer A
Nut
Spring
Intake manifold
Rubber spacer B
Gasket
*a. EGR pipe
*b. Cylinder head
PWEE9409-D
Added
11B-9-2
4M41 ENGINE - Intake Manifold
INSTALLATION SERVICE POINT
Gasket
"AA GASKET INSTALLATION
Fit the gasket to the cylinder head in the direction shown
in the illustration.
Gasket
Cylinder
head
Cylinder head
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-10-1
4M41 ENGINE - Turbocharger Assembly
10. TURBOCHARGER ASSEMBLY
REMOVAL AND INSTALLATION
54 ± 5 Nm
10
*1
5
20 Nm
2
49 ± 4 Nm
1
4
11
*2
13
6
25 ± 2 Nm
8
*3
7
14
3
9
49 ± 4 Nm
Removal steps
1. Eyebolt
2. Oil feed pipe
3. Oil return pipe
4. Nut
5. Coupler insulator
6. Insulator
7. Coupler
8. Gasket
9. Nut
10. Bolt
E Mitsubishi Motors Corporation
Feb. 2000
12
11.
12.
13.
"AA 14.
Insulator B
Insulator A
Gasket
Turbocharger assembly
*1: Exhaust manifold
*2: Turbocharger water outlet pipe
(Refer to page 11B-6-1.)
*3: Turbocharger water inlet pipe
(Refer to page 11B-6-1.)
PWEE9409-D
Added
11B-10-2
4M41 ENGINE - Turbocharger Assembly
INSTALLATION SERVICE POINT
A
"AA TURBOCHARGER ASSEMBLY INSTALLATION
(1) Prior to installing the turbocharger assembly 14, pour
engine oil into it through the oil inlet hole A to lubricate
its component parts for smooth movement.
(2) Using a tester, apply pressure to the actuator B and read
the pressure at which the rod C begins to move
(approximately 1 mm).
If the reading deviates from the specified standard value,
replace the actuator.
C
Caution
Do not load the actuator B with any more pressure
than 181 kPa nor carry the turbocharger by holding
the rod C, or the diaphragm may be damaged.
B
E Mitsubishi Motors Corporation
Standard value: 161 kPa
Feb. 2000
PWEE9409-D
Added
11B-11-1
4M41 ENGINE - Exhaust Manifold
11. EXHAUST MANIFOLD
REMOVAL AND INSTALLATION
*1
3
2
6
7
1
30 ± 3 Nm
*2
5
*3
49 ± 4 Nm
4
Removal steps
1. Insulator
2. Insulator
3. Bolt
4. Nut
5. Nut
6. Exhaust manifold
7. Gasket
E Mitsubishi Motors Corporation
Feb. 2000
*1: EGR pipe
*2: Cylinder head
*3: Turbocharger
PWEE9409-D
Added
11B-12-1
4M41 ENGINE - Injection Pump Assembly
12. INJECTION PUMP ASSEMBLY
REMOVAL AND INSTALLATION
4
6
7
5
19
17
2
20
1
11
18
13
25 ± 2 Nm
9
14
18 ± 2 Nm
8
12
10
16
15
3
Removal steps
1. Injection pump cover B
2. Injection pump cover A
3. Rubber spacer
4. Rubber spacer
5. Harness
6. Harness
7. Harness
8. Harness
9. Harness
10. Fuel return hose
11.
12.
AA" "BA 13.
14.
15.
16.
"AA 17.
18.
19.
20.
Fuel leak-off hose
Fuel suction hose
Injection pipe
Bolt
Pump stay
Pump stay
Injection pump assembly
O-ring
Rubber spacer
Stay
Caution
1. Fuel is highly flammable. Keep it away from flames and sources of heat.
2. Be sure to wipe up spilt fuel completely. It could catch fire.
3. Have the injection pump assembly 17 serviced at an appropriate Zexel service station.
4. Dust particles entering the injection pump assembly 17 can seriously affect the engine
performance. To prevent it, fully cover the openings left after the removal of parts such as
pipes and hoses.
5. Before installing the injection pipe 13, check to ensure that the pipe seating surface is free
from any damage and unevenness.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-12-2
4M41 ENGINE - Injection Pump Assembly
REMOVAL SERVICE POINT
AA" INJECTION PIPE REMOVAL
Loosen the union nut B of the fuel injection pipe 13 while
locking the delivery valve holder A to prevent it from rotating
together.
A
B
13
INSTALLATION SERVICE POINTS
B
A
“0”
MD998754
MB990767
C
"AA INJECTION PUMP ASSEMBLY INSTALLATION
(1) Turn the crankshaft pulley A clockwise with the specified
special tool to place the No.1 piston at the TDC on the
compression stroke. Align the notch C in the crankshaft
pulley with the timing mark “0” on the timing gear case
B.
MB990767
A
Caution
1. If the dent D on the camshaft faces upward, the
No.1 piston is at the TDC on the compression
stroke. If not, rotate the crankshaft pulley A one
more turn in normal direction.
2. Never rotate the crankshaft pulley A in reverse
direction (counterclockwise). It may cause
damage to the timing chain tensioner.
If the crankshaft is accidentally rotated in reverse
direction, remove and reinstall the tensioner
according to the correct installation procedure.
D
(2) Align the notch F on the injection pump gear E with the
mating mark “H” on the flange plate G.
G
E
F
H
4ME0542
L
J
(3) Align the guide bar J of the flange plate G with the guide
hole L of the front plate K and insert the injection pump
assembly into the front plate just before the injection pump
gear E meshes with the idler gear.
E
G
K
E Mitsubishi Motors Corporation
4ME0543
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Injection Pump Assembly
F
E
M
11B-12-3
(4) Confirm that the notch F on the injection pump gear E
is aligned with the mating mark “H” on the flange plate
G. Then push the injection pump assembly further into
the front plate.
When meshing the gears, the notch F on the gear should
move in the direction M.
G
H
4ME0544
A
"BA INJECTION PIPE INSTALLATION
Tighten the union nut B of the fuel injection pipe 13 while
locking the delivery valve holder A to prevent it from rotating
together.
B
13
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-13-1
4M41 ENGINE - Injection Pump Gear
13. INJECTION PUMP GEAR
REMOVAL AND INSTALLATION
Locating pin
20
6
15
5 ± 1 Nm
3
19
16
18
5
10
17
7
38 ± 2 Nm
11
4
9
14
12
2
5 ± 1 Nm
5 ± 1 Nm
180 ± 10 Nm
13
8
1
2
Locating pin
4ME0568
Removal steps
1. Nut
"BA 2. Injection pump gear assembly
3. Snap ring
4. Injection pump sub gear
5. Spring
6. Pin
AA"
7. Injection pump gear
8. Bolt
9. Sensor plate
10. Nut
"AA 11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
Flange plate
Bolt
Engine speed sensor II (Backup)
O-ring
Bolt
Engine speed sensor I (Main)
O-ring
O-ring
Key
Injection pump
Caution
Have the injection pump 20 serviced at an appropriate Zexel service station.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-13-2
4M41 ENGINE - Injection Pump Gear
REMOVAL SERVICE POINT
AA" INJECTION PUMP GEAR REMOVAL
Using the special tool, remove the injection pump gear 7.
MH062567
7
INSTALLATION SERVICE POINTS
"AA FLANGE PLATE INSTALLATION
Install the flange plate 11 while aligning the mating marks
A on the flange plate and the injection pump 20.
11
A
20
Locating pin
7
A
B
"BA INJECTION PUMP GEAR ASSEMBLY
INSTALLATION
(1) Clamp the injection pump gear 7 in a vice B. Protect
the gear teeth with pieces of waste cloth A or the like
as shown.
(2) Remove the locating pin from the pump gear 7.
Caution
1. Check the removed locating pin for deformation
or damage before using it again.
2. Replace the locating pin if deformed or damaged.
C
4
5
7
6
6
E Mitsubishi Motors Corporation
5
(3) Install the injection pump sub gear 4, spring 5 and pins
6 onto the injection pump gear 7 as shown.
(4) Hook each pin 6 on the spring 5 at C.
6
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Injection Pump Gear
(5) Fit the snap ring 3 onto the injection pump gear.
3
D 4
G
MH063473
11B-13-3
7
E
H
D
F
Locating
pin
E Mitsubishi Motors Corporation
(6) Fit the special tool in the hole D in the sub gear 4. Turning
the sub gear with the special tool counter-clockwise, align
the hole E in the sub gear 4 with the hole F in the pump
gear 7, then install the bolt G.
(7) In that state, strike the locating pin into the hole H in
the sub gear 4, then remove the bolt G.
7
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE -
Rocker Cover, Camshaft Holder
Assembly and Camshaft
11B-14-1
14. ROCKER COVER, CAMSHAFT HOLDER ASSEMBLY AND
CAMSHAFT
REMOVAL AND INSTALLATION
Apply engine oil to all
moving parts before
installation.
13 ± 2 Nm
6
11 ± 1 Nm
7
8
9
10
20 ± 1 Nm
14
11
12
18
4
3.0 ± 0.3 Nm
19
17
1
16
15
2
3
26
21
20
25
24
5
23
35
22
27
28
31
38 ± 8 Nm
9.5 ± 0.5 Nm
30
29
32
9.5 ± 0.5 Nm
34
88 ± 10 Nm
33
E Mitsubishi Motors Corporation
Feb. 2000
13
PWEE9409-D
Added
11B-14-2
4M41 ENGINE -
Rocker Cover, Camshaft Holder
Assembly and Camshaft
Removal steps
1. Oil filler cap
2. Bolt
3. Washer
"BA 4. Rocker cover assembly
"BA 5. Rocker cover gasket
6. Eyebolt
7. Gasket
8. Eyebolt
9. Gasket
10. Fuel leak-off pipe
11. Bolt
12. Upper guide plate
AA" "AA 13. Bolt
14. Bolt
15. No.1 camshaft cap
16. No.2 camshaft cap
17. No.3 camshaft cap
18. No.4 camshaft cap
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
No.5 camshaft cap
Intake camshaft
Exhaust camshaft
No.1 camshaft holder
No.2 camshaft holder
No.3 camshaft holder
No.4 camshaft holder
No.5 camshaft holder
Rocker assembly (short)
Lock nut
Adjusting screw
Rocker (short)
Rocker assembly (long)
Lock nut
Adjustng screw
Rocker (long)
Pivot bolt
Caution
Since the camshaft caps 15 through 19 and camshaft holders 22 through 26 have been machined
in pairs, replacement of either one of the pair is not allowed. Also, never alter their original
combination.
PRE-REMOVAL INSPECTION
CAMSHAFT END PLAY
Measure the end play, and if the reading deviates from the
specified value, replace the defective part.
Standard value: 0.10 - 0.18 mm
Limit: 0.3 mm
REMOVAL SERVICE POINT
*b
AA" BOLT REMOVAL
13
*a
B
E Mitsubishi Motors Corporation
Feb. 2000
Caution
1. When removing the bolt 13, be sure to lock the
camshaft 20, 21 by holding the hexagonal part A with
a proper wrench. Do not use the timing chain *b for
the locking.
2. The bolt 13 is inversely threaded. The arrow mark
on its head B indicates its turning direction when
tightened. To remove, turn the bolt in the reverse
direction.
3. The camshaft sprockets *a and timing chain *b must
be meshed in a fixed position. Do not remove the
timing chain from the camshaft sprockets unless
absolutely necessary.
PWEE9409-D
Added
4M41 ENGINE -
Rocker Cover, Camshaft Holder
Assembly and Camshaft
11B-14-3
INSTALLATION SERVICE POINTS
*b
"AA BOLT INSTALLATION
Caution
The bolt 13 is inversely threaded. The arrow mark on
its head B indicates its turning direction when tightened.
13
*a
B
"BA ROCKER COVER GASKET / ROCKET COVER
ASSEMBLY INSTALLATION
Before installing the rocker cover 4, remove all deposites,
especially oil in the gasket groove A.
4
Caution
Install the rocker cover gasket 5 using care so that it
is not distorted.
A
5
INSPECTION
1. CAMSHAFT
(1) Cam Lobe Lift (Difference between Cam Height and Base
Circle Diameter)
If the specified service limit is exceeded, replace the
camshaft 20, 21.
A
20, 21
A: Cam height
B: Base circle diameter
B
Standard value:
Intake
Front
6.16
Rear
6.10
Exhaust
Front
5.91
Rear
6.16
Limit:
Intake
Front
6.11
Rear
6.05
Exhaust
Front
5.86
Rear
6.11
20, 21
C
D
mm
mm
mm
mm
mm
mm
mm
mm
(2) Bend
With the camshaft 20, 21 supported at No.1 journal C
and No.5 journal D, measure the bend at No.3 journal
E. If the reading exceeds the specified service limit,
replace the camshaft 20, 21.
Standard value: 0.015 mm or less
Limit: 0.03 mm
E
E Mitsubishi Motors Corporation
NOTE
The actual shaft bend is a half of what the dial gauge
reads when the camshaft 20, 21 is given one turn.
Feb. 2000
PWEE9409-D
Added
11B-14-4
4M41 ENGINE -
Rocker Cover, Camshaft Holder
Assembly and Camshaft
(3) Oil Clearance at Journals
Measure the oil clearance at each journal. If the reading
exceeds the specified limit, replace the defective part.
15 - 19
Standard value: 0.05 - 0.09 mm
Limit: 0.15 mm
Caution
Be sure to replace the camshaft 15 through 19 together
with the camshaft holder 22 through 26.
22 - 26
20, 21
B
A
2. ROCKER
If radial play B at the roller A of the rocker 30, 34 exceeds
the specified standard value, replace the defective part.
Standard value: 0.03 - 0.07 mm
30, 34
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-15-1
4M41 ENGINE - Injection Nozzle
15. INJECTION NOZZLE
REMOVAL AND INSTALLATION
13 ± 2 Nm
11 ± 1 Nm
5
7
6
20
25
19
8
18
17
21 ± 2 Nm
24
9
16
23
10
13
22
14
21
26
15
12
27
35 ± 5 Nm
Cylinder head
11
4
11 ± 1 Nm
2
3
1
33 ± 3 Nm
4ME0506
Removal steps
1. Injection pipe
2. Injection pipe seal
3. Eyebolt
4. Return pipe
5. Eyebolt
6. Gasket
7. Eyebolt
8. Leak-off pipe
9. Bolt
10. Injection nozzle assembly
AA" "AA 11. Retaining nut
12. Nozzle tip
13. Needle valve
14. Pin
E Mitsubishi Motors Corporation
Feb. 2000
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
PWEE9409-D
Spacer
Llift piece
Spring seat
Shim
No.2 spring
Push rod
Collar
Spring seat
No.1 spring
Shim
Nozzle holder
O-ring
Nozzle gasket
Added
11B-15-2
4M41 ENGINE - Injection Nozzle
Caution
1. Fuel is highly flammable. Keep it away from flames and sources of heat.
2. Wipe up spilt fuel completely. It could catch fire.
3. Remove all deposited carbon from the injection nozzle assembly 10 before disassembling,
reassembling and adjusting it. Prior to intended disassembly, check the injection nozzle 10
for abnormal injection pressure, abnormal spray pattern and fuel leaks. If it is in order, the
disassembly is not needed.
4. Never change the original combination of needle valve 13 and nozzle tip 12 when reassembling
each injection nozzle assembly 10.
5. Dust particles can seriously affect the engine performance. To prevent the ingress of dust,
fully cover and close up the opening left after removal of each injection nozzle assembly 10.
PRE-REMOVAL INSPECTION
Install the nozzle tester A to the injection nozzle assembly
10 and perform the following checks:
Caution
Prior to proceeding with the checks, bleed air from the
fuel injection nozzle by pumping the nozzle tester lever
two or three times.
1. VALVE OPENING PRESSURE CHECK
(1) Operate the nozzle tester A lever at 1 to 2 seconds per
stroke. Read the pressure when, after a gradual increase,
the pointer deflects rapidly.
(2) If the reading deviates from the specified standard value,
disassemble the fuel injection nozzle, clean and
reassemble. Then, make necessary pressure adjustment
using adjusting shims 18, 24.
(3) If the reading still deviates after the adjustment, replace
the fuel injection nozzle assembly 10.
A
10
2. SPRAY PATTERN CHECK
(1) Inject fuel continuously by pumping the nozzle tester A
lever quickly (1 to 2 seconds per stroke).
B
C
D
E
F
G
B:
C:
D:
E:
F:
G:
Even spray from all five injection orifices (Good)
Even and symmetrical spray (Good)
Asymmetrical spray (Bad)
Branched spray (Bad)
Thin spray (Bad)
Irregular spray (Bad)
(2) Disassemble, clean and recheck the fuel injection nozzle
assembly 10 if necessary. If the problem still remains
after another check, replace the fuel injection nozzle
assembly.
(3) Check that the fuel injection nozzle does not dribble after
injection.
Caution
Do not touch the spray that comes out of the nozzle.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Injection Nozzle
11B-15-3
3. OIL TIGHTNESS CHECK
(1) Slowly increase the nozzle internal pressure and maintain
it at a pressure 1960 kPa lower than the specified 1st
valve opening pressure. In this condition, check that the
fuel injection nozzle does not start dribbling within10
seconds.
(2) If the dribbling begins in less than 10 seconds,
disassemble, clean and recheck the fuel injection nozzle
assembly 10. If the problem still remains after another
check, replace the fuel injection nozzle assembly.
REMOVAL SERVICE POINTS
10
157944-9520
AA" RETAINING NUT REMOVAL
Using the special tool, remove the retaining nut.
4ME0510
13
Caution
1. Be sure not to touch the sliding surface A of the needle
valve 13 with dirty hands.
2. Be sure not to change the original combination of
the needle valve 13 and nozzle tip 12 removed.
A
4ME0511
INSTALLATION SERVICE POINT
10
157944-9520
"AA RETAINING NUT INSTALLATION
Using the special tool, install the retaining nut.
4ME0510
13
Caution
1. Be sure not to touch the sliding surface A of the needle
valve 13 with dirty hands.
2. Be sure not to change the original combination of
the needle valve 13 and nozzle tip 12 removed.
A
4ME0511
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-15-4
4M41 ENGINE - Injection Nozzle
105789-0010
13
NOZZLE TIP, NEEDLE VALVE CLEANING
Wash the needle valve 13 and nozzle tip 12 removed in
clean kerosene (cleaning oil) and remove deposited carbon
from them in the following manners using the specified special
tools.
(1) Remove carbon deposited on the tip of the needle valve
13 using the special tool Cleaning Bar.
Caution
For cleaning, never use a wire brush or any other
hard metal tool.
105789-0010
(2) Remove carbon deposited in the nozzle hole area of
the nozzle tip 12 by turning the special tool Needle Cleaner
that runs through the nozzle hole.
Cleaning needle diameter: Less than f0.21 mm
12
(3) Clean the seat of the nozzle tip 12 using the special
tool Cleaning Scraper.
(4) To remove baked carbon, use the Fuso Carbon
Remover.
105789-0010
12
13
12
4ME0515
NOZZLE TIP, NEEDLE VALVE INSPECTION
(1) Wash the needle valve 13 and nozzle tip 12 clean in
clean kerosene (cleaning oil) prior to reassembly.
(2) Pull out the needle valve 13 to approximately one third
of its length, let go of it and see if it slides down by
gravity. (Repeat this procedure a few times after turning
the needle valve each time.)
(3) If the needle valve 13 fails to slide down by itself, wash
it again and give it another check. Replace the needle
valve 13 and nozzle tip 12 as a set.
Caution
1. If a nozzle tip 12 is to be replaced, use a Nozzle
Service Kit to replace the needle valve 13, pin
14, lift piece 16 and spacer 15 at the same time.
2. After replacing the nozzle tip 12, be sure to readjust
the prelift to bring the valve opening pressure
to the specified standard value.
Standard value: 0.05 - 0.07 mm
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Injection Nozzle
11B-15-5
INJECTION NOZZLE ASSEMBLY ADJUSTMENT
While reassembling parts, adjust and check the injection
nozzle assembly in the sequence shown below.
Caution
1. Before starting adjustments and checks, wash all
parts clean in clean kerosene (cleaning oil) to ensure
that they are entirely free of dirt and other foreign
matters.
2. Never touch the sliding contact surface of the needle
valve 13.
Adjusting 1st valve opening pressure
Checking full lift of needle valve
Checking prelift
Adjusting 2nd valve opening pressure
17
18
12
13
14
19
15
20
21
22
23
24
Checking nozzle tip and needle valve
ADJUSTING 1ST VALVE OPENING PRESSURE
(1) Fit parts 12 through 24 to the nozzle holder 25.
25
16
4ME0516
16
(2) Fit the lift piece 16 in the illustrated direction.
16
20
4ME0517
(3) Fit the special tool Gasket onto the nozzle tip 12, then
secure the nozzle tip to the nozzle holder 25 with the
special tool Retaining Nut (for adjustment).
Turn the special tool Retaining Nut (for adjustment)
handtight, then tighten it to the specified torque (34 ±
5 Nm).
157892-3200
12
157892-5100
25
4ME0518
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-15-6
4M41 ENGINE - Injection Nozzle
(4) Attach the nozzle holder 25 to the nozzle tester A.
(5) Pumping the nozzle tester B, measure the 1st valve
opening pressure.
B
25
Standard value: 17.60 - 18.58 MPa
4ME0519
(6) If the reading deviates from the specified standard value,
disassemble the nozzle holder 25 and make pressure
adjustment by changing the existing shim 24 for a shim
with appropriate thickness.
24
Thicknesses of available shims (outside diameter:
f6.2 mm) for 1st valve opening pressure adjustment:
0.40, 0.50, 0.52, 0.54, 0.56, 0.58, 0.60, 0.70 mm
25
4ME0520
157892-5100
157892-1600
026508-1140
CHECKING FULL LIFT OF NEEDLE VALVE
The full lift check is performed to determine if the seat of
the nozzle tip 12 is abnormally worn and if the injection nozzle
assembly 10 is in order as well.
(1) Fit the special tool Gasket and the special tool Plug onto
the special tool Retaining Nut (for adjustment).
4ME0521
157892-4400
25
157944-9520
(2) Fit the nozzle holder 25 to the special tool Plate with
its nozzle tip side down.
(3) Fit the special tool Holder to the nozzle holder 25.
4ME0522
(4) Mount the special tool Nut on the special tool Holder.
157892-1000
157892-4400
4ME0523
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Injection Nozzle
157954-3801
(5) Connect the special tool Pin to the special tool Dial Gauge.
157892-7200
157954-3801
C
11B-15-7
157892-1000
25
157892-7200
(6) Fit the special tool Dial Gauge onto the nozzle holder
25 and secure it with the special tool Nut in such a manner
that the special tool Pin contacts the upper end of the
spring seat 22.
Caution
1. Secure the special tool Dial Gauge so that a stroke
of 2 mm or so can be measured.
2. Do not overtighten the special tool Nut. If it is
too tight, the shaft C of the special tool Dial Gauge
may be stuck.
22
4ME0525
B
157954-3801
25
(7) Attach the nozzle holder 25 to the nozzle tester B, then
zero the special tool Dial Gauge.
(8) Loosen the special tool Plug, then operate the nozzle
tester B to bleed all air out of the special tool Retaining
Nut (for adjustment). Check for fuel leakage at the same
time.
157892-5100
157892-1600
4ME0526
(9) Using the nozzle tester, increase the pipe pressure up
to somewhere between 34.3 and 44.1 MPa to make the
needle valve 13 lift to the full level. Record the dial gauge
reading D of full lift.
D
Needle
valve
lift
(mm)
0
Standard value: 0.23 - 0.27 mm
1st valve opening
pressure
Caution
This check is necessary to determine if the seat of
the nozzle tip 12 is abnormally worn.
34.3 - 44.1
Pipe pressure (MPa)
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-15-8
4M41 ENGINE - Injection Nozzle
CHECKING PRELIFT
(1) With the needle valve 13 fully lifted, release the handle
of the nozzle tester B. This causes the pipe pressure
to decrease with a concomitant drop in dial gauge reading
(needle valve lift).
D
F
Needle
valve E
lift
(mm)
0
D: Amount of needle valve full lift
(2) Read the dial gauge when the 2nd spring 19 has stopped
acting, or when the needle valve 13 has stopped lowering
(at prelift level E), and ascertain that the reading is within
the specified limits of standard value.
1st valve opening
pressure
Pipe pressure (MPa)
Standard value: 0.05 - 0.07 mm
(3) Read the dial gauge with the needle valve 13 at the
prelift measuring point F (1st valve opening pressure +
approx. 1 MPa). (Observe the dial gauge while lowering
the pressure.)
(4) If the dial gauge reading deviates from the specified limits
of standard value, replace the pin 14, lift piece 16, spacer
15, nozzle tip 12 and needle valve 13 with a Nozzle
Service Kit.
14
16
15
13
12
G: Capsule (Zexel part No. 105019-1240)
Standard value: 0.05 - 0.07 mm
G
4ME0529
H
157954-3801
B
ADJUSTING 2ND VALVE OPENING PRESSURE
(1) After checking the prelift, operate the nozzle tester B
and increase the pipe pressure to 34.3 - 44.1 MPa so
that the needle valve lifts fully.
(2) Release the handle of the nozzle tester B. The pipe
pressure will lower with a concomitant drop in dial gauge
reading (needle valve lift).
4ME0530
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Injection Nozzle
11B-15-9
(3) Note the value indicated by the pressure gauge H the
moment the dial gauge indicates the specified amount
of needle valve lift (normally prelift E + 0.05 mm).
D
D: Needle valve full lift
E + 0.05
Needle E
valve
lift
(mm)
0
Standard value: 22.6 - 23.6 MPa
1st valve open- 34.3 - 44.1
ing pressure
Pipe pressure (MPa)
E
157954-3801
A
2nd valve opening
pressure
H
(4) If the dial gauge reading deviates from the specified limits
of standard value, disassemble the nozzle holder 25 and
make pressure adjustment by changing the existing shim
18 for a shim with appropriate thickness.
Thicknesses of available 2nd valve opening pressure
adjusting shims (outside diameter: f7.2 mm):
0.10, 0.20, 0.30, 0.40, 0.50, 0.51, 0.52, 0.53, 0.54,
0.55, 0.56, 0.57, 0.58, 0.59 mm
18
Caution
Adjusting the 1st valve opening pressure changes
the 2nd valve opening pressure. After the lst valve
opening pressure is altered, therefore, be sure to
check and readjust the 2nd valve opening pressure.
25
157954-3801
157892-1000
157892-4400
CHECKING INJECTION NOZZLE ASSEMBLY
Upon completion of all necessary adjustments, perform a
final check on the injection nozzle assembly by the following
procedure.
(1) Remove the special tools Dial Gauge, Nut and Holder.
4ME0533
(2) Remove the special tools Retaining Nut (for adjustment)
and Gasket.
(3) Check that the pin 14 is secured in position. Install the
regular retaining nut 11 handtight. then tighten it to the
specified torque.
(4) Attach the nozzle holder 25 to the nozzle tester B. Using
the nozzle tester B, check the 1st valve opening pressure,
spray form and seat oiltightness. Check that all parts
are leak-free at the same time.
157892-5120
157892-3200
4ME0534
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-16-1
4M41 ENGINE - Cylinder Head and Valve Mechanism
16. CYLINDER HEAD AND VALVE MECHANISM
REMOVAL AND INSTALLATION
Apply engine oil to all
moving parts before
installation.
49 ± 5 Nm + 90_ + 90_
1
13
21 ± 2 Nm
14
2
49 ± 5 Nm + 90_ + 90_
12
3
4
7
14
1.3 ± 1.0 Nm
11
18 ± 2 Nm
58 ± 6 Nm
5
15
6
16
10
9
8
Removal steps
1. Bolt
2. Injection nozzle
3. O-ring
4. Nozzle gasket
5. Nut
6. Connecting plate
7. Glow plug
8. Timing gear upper cover
E Mitsubishi Motors Corporation
Feb. 2000
"HA 9. Tensioner
"HA 10. Gasket
11. Bolt (M10)
12. Cylinder head
13. Cylinder head
14. Washer
AA" "GA 15. Cylinder head
AA" "FA 16. Cylinder head
PWEE9409-D
bolt (M12: long)
bolt (M12: short)
assembly
gasket
Added
11B-16-2
4M41 ENGINE - Cylinder Head and Valve Mechanism
Apply engine oil to all
moving parts before
installation.
17
18
19
20
21
22
25
26
29
47 ± 5 Nm
30
23
24
27
32
Removal steps
17. Valve cap
AB" "EA 18. Valve cotter
19. Valve spring retainer
"DA 20. Valve spring
21. Valve spring seat
"CA 22. Valve stem seal
23. Exhaust valve
24. Intake valve
AC"
AC"
AD"
AD"
"BA
"BA
"AA
"AA
25.
26.
27.
28.
29.
30.
31.
32.
31
28
Exhaust valve guide
Intake valve guide
Exhaust valve seat
Intake valve seat
Sealing cap (f35 mm)
Stud
Water joint
Cylinder head
Caution
1. The cylinder head bolt 12, 13 is tightened to the plastic area. If the bolt shows the evidence
of having been tightened three times, replace it with a new ones.
2. The timing chain slips out of place if the camshaft sprocket is removed from it. If the chain
comes off, remove the timing gear case assembly and put the chain back in position.
3. Replace the valve stem seal 22 with a new one once the exhaust valve 23 or intake valve
24 is removed.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Cylinder Head and Valve Mechanism
11B-16-3
REMOVAL SERVICE POINTS
AA" CYLINDER HEAD ASSEMBLY / CYLINDER HEAD
GASKET REMOVAL
Caution
When removing the cylinder head gasket 16, use care
not to scratch the cylinder head assembly 15, crankcase
assembly and timing gear case assembly.
(1) Loosen the cylinder head bolts stepwise in the sequence
of the numbers shown, then remove them.
11
4 8
12
16 18
13 9
5 1
2 6
10
14 17
15 11
7 3
Caution
Provide one punch mark G on the head of the cylinder
head bolt 12, 13 each time the bolt is tightened. Replace
the bolt that already has three punch marks (the evidence
of having been tightened three times).
G
12, 13
(2) Lift up the cylinder head assembly straight and remove,
while keeping the camshaft sprockets *a in engagement
with the timing chain *b.
(3) After the cylinder head assembly is removed, hold the
camshaft sprockets *a with the special tool to keep the
timing chain *b on it.
15
Component Parts of the Special Tool MH063490 - Cam
Sprocket Holder Kit
A: Nut
B: Washer
C: Spacer
D: Adjusting plate
E: Nut
F: Bolt
G: Bolt
G
C
G F
E
C
*b
*a
A
D
B
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-16-4
4M41 ENGINE - Cylinder Head and Valve Mechanism
AB" VALVE COTTER REMOVAL
<Method 1>
Using the special tools, remove the valve cotters 18 as follows.
MD998772
MD998784
18
BC
A
D E
J
K
L
M
N
F
Component parts of special tool MD998772 Valve Spring
Compressor
A: Wing bolt
B: Retainer
C: Handle
D: Nut
E: Bolt
F: Slotted screw
G: Stay
H: Lock nut
J: Tension spring
K: Mobile nut
L: Washer
M: Snap ring
N: Retainer holder
G
H
(1) Install the special tools on the cylinder head 32 as shown
in the illustration.
P
MD998784
P: Bolt (M8 x 12.5 mm)
32
(2) Install the special tool MD998772 on the special tools
MD998784.
MD998772
MD998784
Q: Washer
R: Nut (M6 x 1 mm)
Q
R
A
G
B
K
19
D
N
E Mitsubishi Motors Corporation
Feb. 2000
(3) Move the retainer B and mobile nut K into a position
where the retainer holder N presses the valve spring
retainer 19 from right above, then secure them with the
wing bolt A.
Use the nuts D to adjust the vertical position of the stay
G.
NOTE
Set the stay G level.
PWEE9409-D
Added
4M41 ENGINE - Cylinder Head and Valve Mechanism
(4) Turning the handle C clockwise to depress the valve spring
retainer 19, remove the valve cotters 18.
C
18
18
11B-16-5
19
MD999597
19
<Method 2>
Using the special tool, compress the valve spring 20 to remove
the valve cotters 18.
A: Protector
A
MD998665
AC" EXHAUST VALVE GUIDE / INTAKE VALVE
GUIDE REMOVAL
Remove the valve guide 25, 26 using the special tool.
25, 26
27, 28
AD" EXHAUST VALVE SEAT / INTAKE VALVE SEAT
REMOVAL
The valve seat 27, 28 is shrink-fitted. To remove it, grind
its inside surface to reduce its thickness, then pull it out at
room temperature.
F: Material to be removed by grinding
F
0.5 - 1.0 mm
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-16-6
4M41 ENGINE - Cylinder Head and Valve Mechanism
INSTALLATION SERVICE POINTS
J
"AA INTAKE VALVE SEAT / EXHAUST VALVE SEAT
INSTALLATION
(1) Measure a diameter of the valve seat hole J, H in the
cylinder head 32 and select an oversize valve seat which
can provide proper amount of cylinder head-to-valve seat
interference.
(2) Rebore the valve seat hole J, H to the diameter appropriate
to the selected oversize valve seat.
H
Unit: mm
MH063613
MH063611
or
MH063612
32
27, 28
A
Oversize valve seat used
0.30
0.60
J: Intake valve seat hole
inside diameter
35.3 - 35.325
35.6 - 35.625
H: Exhaust valve seat hole
inside diameter
33.3 - 33.325
33.6 - 33.625
(3) Immerse the valve seat 27, 28 in liquid nitrogen to cool
enough.
(4) Using the special tools MH063613, MH063611 and
MH063612, press the valve seat 27, 28 in the cylinder
head 32 until it bottoms.
(5) After installing the valve seat 27, 28, lap it and the valve
for proper fit.
"BA INTAKE VALVE GUIDE / EXHAUST VALVE
GUIDE INSTALLATION
(1) Measure a diameter of the valve guide 25, 26 hole in
the cylinder head 32 and select an oversize valve guide
which can provide proper amount of cylinder head-to-valve
guide interference.
(2) Rebore the valve guide hole A to the diameter appropriate
to the selected oversize valve guide.
Caution
Do not install a valve guide of the same size as
removed.
Unit: mm
32
MH063610
16.5 mm
21
25, 26
Oversize valve
guide used
0.05
0.25
0.50
Valve guide hole
inside diameter
12.05 12.068
12.25 12.268
12.50 12.518
(3) Install the valve spring seat 21 in the cylinder head 32,
then install the valve guide by striking the special tool
until it comes into full contact with the valve spring seat
21.
Caution
The installed depth of the valve guide shall be as
specified. Be sure to use the special tool for
installation.
(4) The intake valve guide 26 is longer than the exhaust
valve guide 25. Be sure to install right valve guide in
right place.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Cylinder Head and Valve Mechanism
MH063609
23, 24
25, 26
22
A
32
B
11B-16-7
"CA VALVE STEM SEAL INSTALLATION
(1) Apply a thin coat of engine oil to the lip A of the valve
stem seal 22, then press in the valve stem seal 22 by
hand until its lower end B contacts the top of the valve
guide 25, 26.
(2) Install the valve stem seal 22 in position by carefully
striking the special tool vertically until it comes into full
to fully contact with the valve spring seat surface in the
cylinder head 32.
"DA VALVE SPRING INSTALLATION
Install the valve spring 20 with the blue painted end A upward.
A
20
"EA VALVE COTTER INSTALLATION
<Method 1>
Using the special tools, install the valve cotters 18 as follows.
MD998772
MD998784
18
A
BC
D E
J
K
L
M
N
MD998784
F
G
H
P
Component parts of special tool MD998772 Valve Spring
Compressor
A: Wing bolt
B: Retainer
C: Handle
D: Nut
E: Bolt
F: Slotted screw
G: Stay
H: Lock nut
J: Tension spring
K: Mobile nut
L: Washer
M: Snap ring
N: Retainer holder
(1) Install the special tools on the cylinder head 32 as shown
in the illustration.
P: Bolt (M8 x 12.5 mm)
32
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-16-8
4M41 ENGINE - Cylinder Head and Valve Mechanism
(2) Install the special tool MD998772 on the special tools
MD998784.
MD998772
MD998784
Q: Washer
R: Nut (M6 x 1 mm)
Q
R
B
A
G
K
19
D
NOTE
Set the stay G level.
N
(4) Turning the handle C clockwise to depress the valve spring
retainer 19, install the valve cotters 18.
C
18
18
(3) Move the retainer B and mobile nut K into a position
where the retainer holder N presses the valve spring
retainer 19 from right above, then secure them with the
wing bolt A.
Use the nuts D to adjust the vertical position of the stay
G.
19
MD999597
19
<Method 2>
Using the special tool, compress the valve spring 20 to install
the valve cotters 18.
A: Protector
A
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Cylinder Head and Valve Mechanism
A
B
C
"FA CYLINDER HEAD GASKET INSTALLATION
The cylinder head gasket 16 is a part that needs to be selected
for use. Select the appropriate gasket in the following manner.
(1) When replacing the cylinder head gasket alone-Identify;
the crankcase assembly *d by the crankcase identification
mark “A”, “B”, “C” or “D” stamped on its top surface
and select a gasket of the size corresponding to the mark.
(2) When replacing the piston and connecting rod as well;
1) Measure the piston protrusion from each cylinder.
2) Select the gasket 16 corresponding in thickness to
the largest of the measured piston protrusions.
D
15
NOTE
The gasket varies in type according to the number of
notches in its notched end E.
“A” - “D”
16
11B-16-9
*d
E
*c
Unit: mm
Piston projection
Cylinder head gasket
Maximum piston projection
Crankcase identification
mark
Type by size
Tightened thickness
0.03 - 0.11
A
A (1 notch)
0.67 - 0.73
- 0.05 - 0.03
B
B (2 notches)
0.72 - 0.78
- 0.13 - - 0.05
C
C (3 notches)
0.77 - 0.83
- 0.23 - - 0.15
D
D (4 notches)
0.82 - 0.88
12, 13
E Mitsubishi Motors Corporation
G
Feb. 2000
"GA CYLINDER HEAD ASSEMBLY INSTALLATION
Caution
Before installing the cylinder head bolt 12, 13, check the
number of punch marks D on its head. (The bolt is reusable
if it is two or less.) The number of punch marks
corresponds to that of times the bolt has been tightened
to the plastic area. If the bolt has three punch marks,
replace it.
PWEE9409-D
Added
11B-16-10
4M41 ENGINE - Cylinder Head and Valve Mechanism
(1) Apply a coat of specified sealant to the upper surface
H of the front plate *c that joins the cylinder head gasket
16.
*d
H
Specified sealant:
ThreeBond 1211 or equivalent
H
*e
*c
15
11
9
1713
11
3 1
7
5
2
6 10
14 18
8
16
12
4
12, 13
J
14
(2) Within 3 minutes after the sealant application, install the
cylinder head assembly 15 to the crankcase assembly
*d together with the cylinder head gasket 16.
Caution
1. Check to ensure that the surface H is clean and
free of oil and other foreign matters before sealant
application.
2. During installation of the cylinder head assembly,
use care that the sealant is kept in place.
3. Do not start the engine for at least 1 hour after
the cylinder head assembly is installed.
4. Whenever the cylinder head bolt 11, 12, 13 is
loosened or removed after the cylinder head
assembly has been installed, always apply a fresh
coat of specified sealant.
(3) Tighten the M12 cylinder head bolts 12 and 13 (1 through
18) at M10 bolts 11 in the following manner.
1) Fit the washer 14 onto the cylinder head bolt 12,
13, with its shear-droop side J facing in the direction
shown.
2) Apply a thin coat of engine oil to the threaded part
and seating surface of each cylinder head bolt 12,
13, then tighten the bolts to a torque of 98 ± 10
Nm in the sequence of the numbers shown.
3) Loosen the tightened bolts in the reverse order of
the numbers shown and retighten them to a torque
of 49 ± 5 Nm in the order of the numbers shown.
4) After tightening, give the bolts an additional 90 degree
turn in the sequence of the numbers shown.
5) Then, give the bolts another 90 degree turn to tighten
them completely.
6) After tightening the cylinder head bolt 12, 13, tighten
the bolt 11 to the specified torque.
Caution
The cylinder head bolt 12, 13 has been tightened up
to the plastic area by the above procedure. Once
tightened completely, do not attempt to retighten the
bolt.
E
15
"HA GASKET / TENSIONER INSTALLATION
(1) Fit the gasket 10 to the cylinder head assembly 15 in
the direction shown in the illustration.
E: Sealant coated surface
10
9
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Cylinder Head and Valve Mechanism
*b
B
11B-16-11
(2) Turn the cam A of the tensioner 9 to thrust the plunger
B in and lock the plunger with the hook C. Then, install
the tensioner in that state.
(3) Crank the engine in the normal direction (clockwise).
C
A
9
D
Caution
1. If the tensioner 9 is installed without thrusting
the plunger B in, the timing chain *b may be
damaged by excessive tension.
2. The tensioner 9 stretches the timing chain *b to
optimum tension by means of the internal ratchet
mechanism. If the engine is cranked counterclockwise (as viewed from the front) after the tensioner 9 is installed, an excessive thrust is exerted
to the plunger B and the cam A may be damaged
as a result. Should the engine be cranked counterclockwise, remove the tensioner and re-install it
in the sequence described above.
NOTE
If the engine is cranked in the normal direction (clockwise)
after the tensioner has been installed, the hook C will
be released automatically, the timing chain being adjusted
to optimum tension by means of the internal ratchet
mechanism.
INSPECTION
1. INTAKE AND EXHAUST VALVES
(1) Checking Stem for Wear
Replace the valve 23, 24 if the diameter is below the
specified service limit or uneven wear is recognized.
23, 24
Standard value:
Intake
6.560 - 6.575 mm
Exhaust
6.53 - 6.55 mm
Limit: 6.45 mm
Caution
If the valve 23, 24 is new, be sure to lap it and the
valve seat 27, 28 for proper seating.
(2) Valve Seat Angle and Valve Margin
Correct or replace the valve 23, 24 if the specified service
limit is exceeded.
23, 24
A
E Mitsubishi Motors Corporation
B
Feb. 2000
Standard value:
Valve seat angle
Valve margine
45_ ± 15’
1.0 mm
Limit:
Valve margine
0.8 mm
A: Valve seat angle
B: Valve margin
PWEE9409-D
Added
11B-16-12
4M41 ENGINE - Cylinder Head and Valve Mechanism
23, 24
27, 28
A
2. VALVE SEAT
(1) Valve Seat Width
Replace the valve seat 27, 28 if the specified service
limit is exceeded.
A: Valve seat width
Standard value: 1.8 - 2.2 mm
Limit: 2.8 mm
Caution
When the valve seat 27, 28 has been corrected or
replaced, lap it and the valve 23, 24 for proper seating.
(2) Valve Sinkage from Cylinder Head Bottom
If the specified service limit is exceeded, correct or replace
the defective part.
23, 24
27, 28
B: Valve sinkage
Standard value: 0.05 - 0.55 mm
Limit: 0.8 mm
B
3. VALVE AND VALVE GUIDE
If the clearance exceeds the specified service limit, replace
the defective part.
25, 26
23, 24
Standard value:
Intake
0.02 - 0.06 mm
Exhaust
0.05 - 0.09 mm
Limit:
Intake
Exhaust
A
B
23, 24
0.10 mm
0.15 mm
4. VALVE AND VALVE SEAT
(1) Apply an even coat of minium to the valve seating surface
A of the valve seat 27, 28.
(2) Strike the valve 23, 24 against the valve seat 27, 28
once while taking care that the valve is not rotated.
B: Valve Lapper
Caution
Before proceeding with the contact check, examine
the valve 23, 24 and valve guide 27, 28 in detail to
see if they are in normal condition.
(3) Determine the valve seating condition from minium pattern
printed on the valve 23, 24. If any abnormal contact is
found, take the following corrective action.
E Mitsubishi Motors Corporation
Feb. 2000
Condition
Corrective action
Minor defect
Lap valve for better seating.
Major defect
Correct or replace valve and valve
seat.
PWEE9409-D
Added
4M41 ENGINE - Cylinder Head and Valve Mechanism
11B-16-13
5. CYLINDER HEAD ASSEMBLY
Measure the distortion of the bottom surface of the cylinder
head 31. If the measured value exceeds the limit, replace
the cylinder head.
Standard value: 0.05 mm or less
Limit: 0.2 mm
CORRECTION
1. INTAKE VALVE AND EXHAUST VALVE
Caution
1. The grinding should be minimum.
2. If the valve margin deviates from the specified
service limit after grinding, replace the valve 23,
24.
3. After grinding, lap the valve 23, 24 and valve seat
27, 28 for proper seating.
E
2. VALVE SEAT
(1) Grind the valve seat 27, 28 using a valve seat cutter
or a valve seat grinder.
(2) Polish the ground surface lightly using a #400 sandpaper
held between the cutter and valve seat.
(3) Correct the seat width C of the valve 23, 24 to the specified
value using a 15_ or 75_ cutter.
D
C
27, 28
23, 24
D: Valve seat angle
Standard value: 45_ ± 15’
Caution
1. Be sure that the sinkage E of the valve 16, 17
does not exceed the specified service limit as
a result of the correction.
Limit: 0.8 mm
2. After the correction, lap the valve 23, 24 and valve
seat 27, 28 for proper seating.
23, 24
C
A
E Mitsubishi Motors Corporation
Feb. 2000
3. VALVE AND VALVE SEAT
Lap the valve and valve seat as follows:
(1) Apply a thin coat of lapping compound evenly to the
valve seating surface A of the valve seat 27, 28.
Caution
1. Keep the stem C of the valve 23, 24 free from
the lapping compound.
2. Use an intermediate-mesh compound (120 150 meshes) first, then a fine-mesh compound
(over 200 meshes).
3. To achieve even application of the lapping
compound, a mix with a small quantity of
engine oil is recommended.
PWEE9409-D
Added
11B-16-14
4M41 ENGINE - Cylinder Head and Valve Mechanism
(2)Using Valve Lapper, strike the valve 23, 24 against
the valve seat 27, 28 a few times while turning little
by little.
B
B: Valve Lapper
(3) Wash off the lapping compound in kerosene.
(4) Apply a thin coat of engine oil to the seating surface
of the valve seat 27, 28 and oil lap.
(5) Check the seat contact between the valve 23, 24
and valve seat 27, 28.
(6) Replace the valve seat 27, 28 if necessary.
23, 24
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-17-1
4M41 ENGINE - Vacuum Pump
17. VACUUM PUMP
REMOVAL AND INSTALLATION
<With ABS>
<Without ABS, LHD>
<Without ABS, RHD>
20 ± 2 Nm
7
11
3
3
10
9
8
4
2
6
1
5.4 ± 0.4 Nm
5
Removal steps
1. Vacuum hose
2. Vacuum pipe
3. Eyebolt
4. Oil pipe
5. Vacuum pump assembly
6. Bolt
E Mitsubishi Motors Corporation
Feb. 2000
7.
8.
9.
10.
11.
PWEE9409-D
Cover
O-ring
Vane
Body assembly
O-ring
Added
11B-17-2
4M41 ENGINE - Vacuum Pump
INSPECTION
B
VACUUM PUMP ASSEMBLY
(1) Connect a vacuum tank (capacity: 10 liters) to the vacuum
pump assembly 5 through a vacuum gauge A.
B: Engine oil inlet
C: Engine oil outlet (to oil pan)
C
A
5
D
(2) With the engine running, read the engine speed when
the vacuum builds up to the standard value.
Standard value:
Degree of vacuum: 93 kPa or more
Pump speed: 1500 r/min
(3) If the reading deviates from the specified standard value,
replace the vacuum pump.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-18-1
4M41 ENGINE - Timing Gear Case
18. TIMING GEAR CASE
REMOVAL AND INSTALLATION
Apply engine oil to all
moving parts before
installation.
14
13
23 ± 2 Nm
323 ± 32 Nm
3
11
12
4
12
2
6
23 ± 2 Nm
5
10
1
AA"
7
9
8
Removal steps
1. Timing gear lower cover
2. Bolt
3. Washer
4. Crankshaft pulley
5. Power steering pump assembly
6. O-ring
7. Vacuum pump assembly
8.
9.
10.
"BA 11.
12.
"AA 13.
14.
O-ring
Bearing block
O-ring
Front oil seal
Cap nut
Timing gear case
Key
Caution
Do not remove the front oil seal unless absolutely necessary.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-18-2
4M41 ENGINE - Timing Gear Case
REMOVAL SERVICE POINT
AA" CRANKSHAFT PULLY REMOVAL
Holding the crankshaft pulley 4 with the special tool, remove
the bolt 2.
4
MD998754
MB990767
INSTALLATION SERVICE POINTS
13
"AA TIMING GEAR CASE INSTALLATION
Apply an even bead of sealant to the entire joint surface
of the timing gear case 13 as shown. Bead diameter: 3.5
mm.
Specified sealant:
Mitsubishi Genuine Part No. MD970389 or equivalent
Caution
Squeeze out the sealant uniformly without excess and
discontinuity.
A
11
13
A: End surface (front oil seal)
B: End surface (timing gear case)
C: Lip
C
E Mitsubishi Motors Corporation
B
"BA FRONT OIL SEAL INSTALLATION
Apply a thin coat of engine oil to the lip C, and install the
front oil seal 11 in the timing gear case 13 with the lip directed
as shown until its end surface A becomes flush with the
end surface B of the case.
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Timing Gear and Balance Shaft
11B-19-1
19. TIMING GEAR AND BALANCE SHAFT
REMOVAL AND INSTALLATION
Apply engine oil to all
moving parts before
installation.
18
14
15
15
17
16
19
40
13
12
36 ± 4 Nm
24
32
20
21
11
2
3
1
5
6
10
9
7
29
33 ± 3 Nm
45
8
40 ± 4 Nm
42
41
4
40
28
39
12 ± 1 Nm
27
22
23
37
24
38
36 ± 4 Nm
36
44
43
25
E Mitsubishi Motors Corporation
Feb. 2000
26
30 31
32
33 34
PWEE9409-D
35
Added
11B-19-2
4M41 ENGINE - Timing Gear and Balance Shaft
Removal steps
1. Upper guide plate
2. Cam sprocket
"GA 3. Timing chain
4. Bolt
5. Tension lever
6. Tension lever shaft
7. Lower guide plate
8. Bolt
9. Guide plate washer
10. Guide plate
11. Bolt
"FA 12. Balance shaft assembly RH
13. Bolt
14. Washer
15. Balance shaft gear RH
16. Thrust spacer
17. Oil pump assembly
18. Key
19. Balance shaft RH
20. O-ring
21. O-ring
22. Bolt
23. Idler washer
"EA 24. Idler gear assembly LH
AA" "DA 25. Idler gear bush LH
26. Idler gear LH
27. Idler shaft
28. Bolt
"CA 29. Balance shaft assembly LH
30. Bolt
31. Washer
32. Balance shaft gear LH
33. Thrust spacer
34. Bush
35. Thrust plate
36. O-ring
37. Key
38. Balance shaft LH
39. Oil jet assembly
40. Bolt
41. Idler washer
"BA 42. Idler gear and sprocket assembly
AB" "AA 43. Idler sprocket bush
44. Idler gear and sprocket
45. Idler shaft
Caution
After installing the bolt 4, check that the tension lever 5 moves smoothly.
PRE-REMOVAL INSPECTION
1. BACKLASH
Measure backlash between gears, pair by pair, at three
or more points. If the reading exceeds the specified service
limit, replace defective part.
Standard value:
Balance shaft gear RH and oil pump gear
0.04 - 0.19
Oil pump gear and crankshaft gear
0.04 - 0.18
Crankshaft gear and idler gear 0.04 - 0.18
Idler gear and idler gear LH
0.04 - 0.19
Idler gear LH and balance shaft gear LH
0.04 - 0.22
Idler gear and injection pump gear
0.04 - 0.21
Limit:
Balance shaft gear RH and oil pump gear
0.3
Oil pump gear and crankshaft gear
0.3
Crankshaft gear and idler gear
0.3
Idler gear and idler gear LH
0.3
Idler gear LH and balance shaft gear LH
0.4
Idler gear and injection pump gear
0.4
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
mm
Added
4M41 ENGINE - Timing Gear and Balance Shaft
11B-19-3
2. END PLAY
If the reading exceeds the specified service limit, replace
defective part.
Standard value:
Balance shaft LH, RH
0.09 - 0.24 mm
Idler gear and sprocket assembly
0.05 - 0.20 mm
Idler gear LH assembly
0.05 - 0.20 mm
Limit:
Balance shaft LH, RH
Idler gear and sprocket assembly
Idler gear LH assembly
0.3 mm
0.3 mm
0.3 mm
REMOVAL SERVICE POINTS
AA" IDLER GEAR BUSH LH REMOVAL
Using the special tool, remove the idler gear bush 25.
MH062463
25
AB" IDLER SPROCKET BUSH REMOVAL
Using the special tool, remove the idler sprocket bush 43.
MH062462
43
INSTALLATION SERVICE POINTS
MH062462
“0”
"AA IDLER SPROCKET BUSH INSTALLATION
Using the special tool, press-fit the idler sprocket bush 43
into the idler gear and sprocket 42 from the side showing
the match mark “0”.
42
43
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-19-4
4M41 ENGINE - Timing Gear and Balance Shaft
"BA IDLER GEAR AND SPROCKET ASSEMBLY
INSTALLATION
Install the idler gear and sprocket assembly 42 onto the idler
shaft 45 while aligning the mark “1” with that on the crankshaft
gear *c.
“1”
*c 45
42
"CA BALANCE SHAFT LH ASSEMBLY INSTALLATION
(1) Assemble the parts shown in the illustration to the balance
shaft LH 38.
Be sure that the washer 31 and thrust spacer 33 face
in correct direction as shown. Install the balance shaft
gear LH 32 with the side showing the match mark “0”
outward.
33
“0”
32
38
35 A
A: Shear droop side
31
(2) Insert the completed balance shaft LH assembly 29 into
the crankcase assembly *a and set it in position with
the dowel pin on the crankcase assembly.
29
MH062463
33
Caution
1. Do not rotate the balance shaft LH assembly 29
during insertion into the crankcase assembly *a.
This may cause the O-ring 35 to be slipped out
of place.
2. Insert the balance shaft LH assembly 29 using
care not to damage the inner surface of the balance
shaft bush in the crankcase.
*a
"DA IDLER GEAR BUSH LH INSTALLATION
Using the special tool, press-fit the idler gear bush LH 25
into the idler gear LH 26 from the side showing the match
marks “3” and “0”.
“3”
“0”
25
26
“3”
42
32
24
“F”
27
23
E Mitsubishi Motors Corporation
Feb. 2000
"EA IDLER GEAR LH ASSEMBLY INSTALLATION
(1) Install the idler gear LH assembly 24 onto the idler shaft
27. At this time, be sure to align the match marks “3”
and “0” on the idler gear with the corresponding match
marks on the idler gear and sprocket assembly 42 and
the balance shaft gear LH 32.
(2) Then, install the idler washer 23 to the idler gear LH
assembly with its front mark “F” facing outward.
“0”
PWEE9409-D
Added
4M41 ENGINE - Timing Gear and Balance Shaft
"FA BALANCE SHAFT RH ASSEMBLY INSTALLATION
(1) Assemble the parts shown in the illustration to the balance
shaft RH 19.
Be sure to install the washer 14 and thrust spacer 16
in the direction shown in the illustration, and install the
balance shaft gear RH 15 with its mating mark “0” aligned
with the mating mark “6” on the oil pump gear *d.
16
A
14
15
A: Shear droop side
19
“0”
*d
*e
12
“5”
*c
*a
(3) After the timing gears are installed in position, check that
all the rotary parts smoothly rotate.
"GA TIMING CHAIN INSTALLATION
(1) Hold the camshaft sprocket 2 using the special tool.
FG
D
E
2
2
AB
J
C
Component Parts of Special Tool MH063490 - Cam
Sprocket Holder Kit
A: Nut
B: Washer
C: Spacer
D: Adjusting plate
E: Nut
G: Bolt
(2) Check that the match mark “1” on the idler gear and
sprocket assembly 42 is in alignment with that on the
crankshaft gear *c.
(3) Align the match mark “0” on the idler gear and sprocket
assembly 42 with the mark link plate H of the timing
chain 3.
2
J
(2) Insert the completed balance shaft RH assembly 12 into
the crankcase assembly while aligning the mating marks
“5” on the oil pump gear *d and the crankshaft gear *c,
and set the shaft assembly in position with the dowel
pin on the crankcase assembly *a.
Caution
Insert the balance shaft RH assembly using care not
to damage the inner surface of the balance shaft bush
in the crankcase.
*d
AB
11B-19-5
3
Caution
The timing chain 3 has the match mark provided at
two places: one bright white link plate H at one place
and a pair of bright white link plates J at the other.
“0”
“1”
(4) Place the timing chain 3 around the camshaft sprockets
2 while aligning the timing mark “0” on the camshaft
sprockets with the mark link plate J on the timing chain.
(5) After installing the timing chain 3, attach the idler washer
41 with the front mark “F” facing outward.
*c
“F”
39
41
42
H
E Mitsubishi Motors Corporation
“0”
Feb. 2000
PWEE9409-D
Added
11B-19-6
2
4M41 ENGINE - Timing Gear and Balance Shaft
L
INSPECTION
E D
1. TIMING CHAIN
(1) Aligning the stamped lines L on the adjusting plate D
and nut E, set the camshaft sprocket 2 in position.
(2) Push the tension lever 5 by hand to take up the slack
of the timing chain 3. Measure the minimum clearance
K between the chain spans facing each other. If the
reading deviates from the specified limit, replace the timing
chain.
3
K
5
Standard value: 16.5 mm
Limit: 9 mm
5
A
2. TENSION LEVER AND TENSION LEVER SHAFT
(1) Replace the tensioner lever 5 if it shows any cracks or
flakes on the surface A that makes sliding contact with
the timing chain and the tensioner contact surface B.
B
6
5
(2) If the tensioner lever 5 to tension lever shaft 6 clearance
exceeds the specified limit, replace the defective part.
Standard value: 0.06 - 0.18 mm
Limit: 0.3 mm
A
E Mitsubishi Motors Corporation
10
Feb. 2000
3. GUIDE PLATE
Replace the guide plate 10 if it shows any cracks or
flakes on the surface A that makes sliding contact with
the timing chain.
PWEE9409-D
Added
4M41 ENGINE - Timing Gear and Balance Shaft
11B-19-7
4. IDLER GEAR BUSH LH AND IDLER SHAFT
If the idler gear bush 25 to idler shaft 27 clearance exceeds
the specified limit, replace the defective part.
25
Standard value: 0.02 - 0.05 mm
Limit: 0.1 mm
27
5. IDLER SPROCKET BUSH AND IDLER SHAFT
If the idler sprocket bush 43 to idler shaft 45 clearance
exceeds the specified limit, replace the defective parts.
43
Standard value: 0.02 - 0.06 mm
Limit: 0.1 mm
45
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-20-1
4M41 ENGINE - Oil Pump
20. OIL PUMP
REMOVAL AND INSTALLATION
44 ± 4 Nm
14 13 12
10 ± 1 Nm
15
9
*3
11
10
7
6
5
36 ± 3 Nm
3
8
4
A
2
16
17
*1
18
*2
1
Removal steps
1. Balance shaft RH assembly
2. Bolt
3. Washer
4. Balance shaft gear RH
5. Thrust spacer
6. Key
7. Balance shaft RH
8. Oil pump assembly
9. Screw
10. Oil pump cover
11. Driven gear assembly
12. Plug
E Mitsubishi Motors Corporation
Feb. 2000
13.
14.
15.
16.
17.
18.
Relief valve spring
Steel ball
Gear and body assembly
O-ring
O-ring
O-ring
*1: Crankcase
(Refer to page 11B-25-1.)
*2: Crankshaft gear
*3: Drive gear
A: Locating pin
PWEE9409-D
Added
11B-20-2
4M41 ENGINE - Oil Pump
INSPECTION
10
11
15
OIL PUMP
(1) Shaft to Oil Pump Case and Cover Clearances
In either case, if the measurement exceeds the specified
service limit, replace oil pump assembly.
Standard value: 0.03 - 0.05 mm
Limit: 0.15 mm
*3
15
(2) Difference between Gear Height and Oil Pump Case
Depth
If the difference exceeds the specified service limit, replace
defective part.
Standard value: 0.05 - 0.10 mm
Limit: 0.15 mm
11
(3) Gear Tooth Crest-to-Oil Case Clearance
If the clearance exceeds the specified service limit, replace
defective part.
Standard value: 0.15 - 0.26 mm
*3
Limit: 0.27 mm
15
11
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-21-1
4M41 ENGINE - Oil Cooler and Oil Filter
21. OIL COOLER AND OIL FILTER
REMOVAL AND INSTALLATION
16
15
14
*
5
2
4
13
1
3
8
20 ± 2 Nm
7
9
10
11
12
44 ± 4 Nm
44 ± 4 Nm
30 ± 3 Nm
Removal steps
"AA 1. Oil filter
2. Oil cooler assembly
3. Nut
4. O-ring
5. Oil cooler element
6. Plug
7. Bypass valve spring
8. Plunger
9. Plug
E Mitsubishi Motors Corporation
6
Feb. 2000
10.
11.
12.
13.
14.
15.
16.
Regulator valve spring
Plunger
Water drain plug
Oil cooler body
O-ring
Gasket
Water separate lip
*: Crankcase assembly
PWEE9409-D
Added
11B-21-2
4M41 ENGINE - Oil Cooler and Oil Filter
CLEANING
(1) Check the oil cooler element 5 for deposited carbon and
sludge in oil passage and bypass, and wash it clean
in cleaning oil, if necessary.
(2) Wash the oil cooler element 5 and the oil cooler body
13 if they are much contaminated with scale.
INSPECTION
OIL COOLER ELEMENT
(1) Immerse the oil cooler element 5 in a water tank, with
the oil outlet A closed. Connect a hose to the engine
oil inlet B.
(2) Apply an air pressure of 1470 kPa into the oil cooler
element 5 through the connected hose, and check for
air leaks.
(3) Replace the oil cooler element 5 if it leaks.
A
B
INSTALLATION SERVICE POINT
"AA OIL FILTER INSTALLATION
(1) Clean the surface of the oil cooler assembly 2 which
contacts the oil filter 1.
(2) Apply a thin coat of engine oil to the gasket A on the
oil filter 1.
(3) Holding the gasket A in contact with the oil cooler assembly
2, tighten the cover 5/8 turn.
2
A
MH061590
1
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Oil Pan, Oil Strainer and Oil Jet
11B-22-1
22. OIL PAN, OIL STRAINER AND OIL JET
REMOVAL AND INSTALLATION
*2
*1
11
9
8
3
10
32 ± 3 Nm
7
6
4
1
5
39 ± 3 Nm
2
Removal steps
1. Drain plug
2. Oil pan cover LH
3. Oil pan cover RH
4. Oil pan cover
5. Bolt
"AA 6. Oil pan
7. Oil level sensor
8. Oil strainer
9. O-ring
E Mitsubishi Motors Corporation
Feb. 2000
10. Check valve
(Refer to page 11B-25-1.)
11. Oil jet (Refer to page 11B-25-1.)
*1: Lower
(Refer
*2: Upper
(Refer
PWEE9409-D
crankcase
to page 11B-25-1.)
crankcase
to page 11B-25-1.)
Added
11B-22-2
B
4M41 ENGINE - Oil Pan, Oil Strainer and Oil Jet
INSTALLATION SERVICE POINT
C
"AA OIL PAN INSTALLATION
(1) Apply sealant at the bottom B of the mating surface of
lower crankcase C and timing gear case D.
D
B
(2) Apply even beads of sealant A without skips to the
circumferential mating surface of the oil pan 6 as shown.
Bead diameter: f3.5 ± 1 mm
A
6
5
Specified sealant:
Mitsubishi Genuine
equivalent.
Part
No.
MD970389
or
(3) Install the oil pan 6 to the lower crankcase within 15
minutes after the application of sealant A.
A
f3.5 ± 1 mm
E Mitsubishi Motors Corporation
Feb. 2000
Caution
1. The surface to be coated with sealant A must
be clean and free of slush and other foreign
matters.
2. When installing, take care that sealant A does
not smear other places.
3. After the oil pan 6 is installed, wait for at least
one hour before starting the engine.
4. Remove and reinstall the oil pan 6 with fresh beads
of sealant A whenever the bolts 5 (holding the
oil pan) were loosened or removed after the
installation.
PWEE9409-D
Added
4M41 ENGINE - Piston and Connecting Rod
11B-23-1
23. PISTON AND CONNECTING ROD
REMOVAL AND INSTALLATION
Apply engine oil to all
moving parts before
installation.
5
4
2
29 ± 3 Nm + 49 ± 5 Nm + 45_ + 45_
1
3
4ME0597
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-23-2
4M41 ENGINE - Piston and Connecting Rod
6
Apply engine oil to all
moving parts before
installation.
7
8
10
11
9
15
13
12
AA"
"FA
"FA
"EA
AB" "DA
AB" "DA
14
Removal steps
1. Nut
2. Lower connecting rod bearing
3. Connecting rod cap
4. Upper connecting rod bearing
5. Piston and connecting rod assembly
6. 1st compression ring
7. 2nd compression ring
AB" "DA 8.
9.
AC" "CA 10.
AC" "CA 11.
AC" "CA 12.
AD" "BA 13.
"AA 14.
15.
Oil ring
Snap ring
Piston pin
Piston
Connection
Connecting
Connecting
Connecting
rod assembly
rod bush
rod bolt
rod
Caution
1. Do not remove the connecting rod bolt 14 unless absolutely necessary.
2. The nut 1 and connecting rod bolt 14 are tightened to the plastic area. If the nut 1 has three
punch marks indicating that they have been tightened three items, replace both the nut 1 and
the connecting rod bolt 14.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Piston and Connecting Rod
11B-23-3
PRE-REMOVAL INSPECTION
*b
1. PISTON PROTRUSION FROM CRANKCASE TOP
Caution
Do not fail to check piston protrusions. The engine
performance are directly influenced by them.
(1) Position each piston at the TDC.
(2) There are five reference points A on the upper
crankcase *b that serve as a zero level each. Check
piston protrusions with respect to these reference
points. (Piston protrusion = Measuring point B Reference point A)
(3) Measure piston protrusions at two points per cylinder
(8 in total) using the closest reference point, and
average the readings.
(4) If the average deviates from the specified standard
value, check clearances at necessary points.
Standard value: - 0.20 - - 0.30 mm
(5) Select the cylinder head gasket having a thickness
that corresponds with the average of piston
protrusions (measured at 8 points).
2. CONNECTING ROD END PLAY
(1) Measure end play of each connecting rod.
(2) If the measurement exceeds the specified service limit,
replace defective part.
Standard value: 0.15 - 0.45 mm
Limit: 0.6 mm
REMOVAL SERVICE POINTS
A
5
AA" NUT REMOVAL
Caution
Provide one punch mark A on the head of the nut 1 each
time it is used to tighten the connecting rod bolt 14. If
it has three punch marks (the evidence of having been
tightened 3 times), replace both the nut 1 and the
connecting rod bolt 14.
14
1
MH060014
E Mitsubishi Motors Corporation
Feb. 2000
AB" PISTON RING REMOVAL
Using the special tool, remove each piston ring.
PWEE9409-D
Added
11B-23-4
4M41 ENGINE - Piston and Connecting Rod
9
D
11
10
AC" PISTON PIN / PISTON / CONNECTING ROD
ASSEMBLY REMOVAL
Remove the piston pin 10 using an appropriate push-out
bar D as shown.
NOTE
To make the piston pin 10 easy to remove, warm the piston
11 over an appropriate heater or in hot water if necessary.
12
AD" CONNECTING ROD BUSH REMOVAL
Use the special tool to remove the connecting rod bush 13.
Component Parts of Special Tool MH062574 - Connecting
Rod Bush Puller Kit
A: Collar
B: Collar
C: Puller
D: Base
E: Bracket
F: Plate
G: Nut
MH062574
C
H
A
13 E
15
F
1. Secure the connecting rod 15 to the base D with the
bracket E and plate F.
2. Attach the collar A onto the puller C as shown, and remove
the connecting rod bush 13 slowly under a press ram
load H of approximately 49,035 N.
D
INSTALLATION SERVICE POINTS
15
14
C
B
A
E Mitsubishi Motors Corporation
Feb. 2000
"AA CONNECTING ROD BOLT INSTALLATION
(1) Check that the bolt hole A in the connecting rod 15 is
free of damage, burrs, etc.
(2) Apply a thin coat of engine oil to the knurled portion
B of the connecting bolt 14. Then, fit it in the connecting
rod with the notch C in the head inward under a press
ram load of less than 4,903 N.
C: Notch in bolt head
PWEE9409-D
Added
4M41 ENGINE - Piston and Connecting Rod
11B-23-5
"BA CONNECTING ROD BUSH INSTALLATION
Use the special tool to install the connecting rod bush 13.
H
C
B
J
13
13
15
Component Parts of Special Tool MH062574 - Connecting
Rod Bush Puller Kit
A: Collar
B: Collar
C: Puller
D: Base
E: Bracket
F: Plate
G: Nut
(1) Apply a thin coat of engine oil to the outside surface
of the connecting rod bush 13 and the bush fitting hole
in the connecting rod 15.
(2) Set the collar B, connecting rod bush 13 and collar A
on the puller C as shown and secure them with the nut
G.
(3) Aligning the oil holes J, press-fit the connecting rod bush
13 into the connecting rod 15 slowly under a press ram
load H of approximately 49,035 N.
(4) After press-fitting, ream the connecting rod bush 13 for
the specified push-to-piston pin clearance.
A
G
Standard value: 0.03 - 0.05 mm
Limit: 0.1 mm
Caution
After reaming, insert the piston pin 10 into the
connecting rod bush 13 to ensure that it smoothly
moves with little play.
"CA PISTON / PISTON PIN / CONNECTING ROD
ASSEMBLY INSTALLATION
(1) Use a piston 11 having the same size mark “A”, “B”,
or “C” as that stamped beside each cylinder on the upper
crankcase. (The marks are found in the order of the
cylinders No. 1, 2, 3 and 4 starting from the engine front
G.)
H
G
H: Location of stamped size mark
Caution
A mismatch of size marks can result in the piston
11 being seized while in motion.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-23-6
4M41 ENGINE - Piston and Connecting Rod
(2) Apply a thin coat of engine oil to the piston pin 10 prior
to insertion. Assemble the connecting rod 12 and piston
11 facing in the directions shown.
“¬”
“1”: Connecting rod identification mark
“¬”: Front mark
NOTE
To make the piston pin 10 easy to install, warm the piston
11 over an appropriate heater or in hot water if necessary.
11
10
9
Caution
After inserting the piston pin 10, check to ensure
that the piston moves smoothly with little play.
“1”
12
B
D
E
A
"DA PISTON RING INSTALLATION
(1) Install the oil ring 8 onto the piston 11 with its end gap
positioned at A and the abutting end of the expander
spring at B as shown.
(2) Install the compression rings 6, 7 onto the piston 11,
with their manufacturer’s mark C (stamped near the end
gap) facing upward and their end gap D, E positioned
as shown.
“¬”
C
6, 7
11
A
5
14
1
*b
D
C
5
B
E
D: End gap of 1st compression ring
E: End gap of 2nd compression ring
“¬”: Front mark
"EA PISTON AND CONNECTING ROD ASSEMBLY
INSTALLATION
Caution
Before installing the piston and connecting rod assembly
5, check the head of the nut 1 for punch marks. The
number of punch marks corresponds to the number of
times the mating connecting rod bolt has been tightened
to the plastic area (bolts with two punch marks or less
are reusable). If there are three (the evidence of having
been tightened 3 times), replace both the nut 1 and the
connecting rod bolt B.
(1) Check that the end gaps of the piston rings C are in
position.
(2) Check that the size marks D on the pistons are the same
as the respective marks on the upper crankcase.
(3) Sheathe the connecting rod bolt B with a vinyl hose E
so as not to damage the cylinder inside surface of the
upper crankcase *b and the pin of the crankshaft assembly
*a.
*a
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Piston and Connecting Rod
11B-23-7
(4) Using the special tool, install the piston and connecting
rod assembly in position, with the front mark “¬” on
the piston crown facing toward the engine front F.
“¬”
F
MH063484
(5) Press the piston down. Apply a thin coat of engine oil
to the threaded part of the connecting rod bolt, then install
the connecting rod cap 3 while aligning the lugs H of
the upper connecting rod bearing shell 4 and lower
connecting rod bearing shell 2.
(6) Tighten the nuts 1 alternately in the following manner.
1) Tighten the nut 1 to a torque of 29 ± 3 Nm.
2) Tighten further to a torque of 49 ± 5 Nm.
3) Give a 45_ ± 5_ turn.
4) Give another 45_ ± 5_ turn to complete the tightening.
1
3
2
H
4
Caution
The nut is tightened to a point where the bolt is
plastically deformed. Do not tighten it any more than
the final turn.
(7) After the connecting rod cap 3 is secured, check the
following.
1) Connecting rod end play
2) Piston protrusion
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-23-8
4M41 ENGINE - Piston and Connecting Rod
"FA CONNECTING ROD BEARING INSTALLATION
The connecting rod bearing 2, 4 to be used must have an
appropriate thickness that matches the big end I.D. of the
connecting rod and the pin O.D. of the crankshaft assembly.
There are two methods available for selecting an appropriate
bearing.
<Selection by measurement>
(1) Measure the big end I.D. of the connecting rod (with
connecting rod bearing 2,4 removed) and the pin O.D.
of the crankshaft assembly.
*a
A
A: Measuring point
Connecting rod: 1 point in vertical direction
Crankshaft: 1 point in any direction
A
Caution
Before measuring the big end O.D. of the connecting
rod, tighten the nut B to a torque of 49 ± 5 Nm.
B
(2) Select connecting rod bearing shells 2, 4 having the
thickness that matches the respective measured values
from the table below. Install the selected connecting rod
bearing shells with their lug C fitted in the mating groove
of the connecting rod.
2
C
4
C
E
D
D: Location of connecting rod bearing identification color
(side)
Caution
The upper connecting rod bearing shell 4 has an oil
hole E, while the lower connecting rod bearing shell
2 has no oil hole. Be careful not to install them in
wrong place.
Crankshaft pin O.D.
Connecting rod big end I.D.
Compatible connecting rod bearing
identification color (Figures in brackets are sheet thicknesses)
53.980 - 53.988
58.010 - 58.019 mm
None (1.992 - 1.996 mm)
58.000 - 58.010 mm
Blue (1.988 - 1.992 mm)
58.010 - 58.019 mm
Yellow (1.996 - 2.000 mm)
58.000 - 58.010 mm
None (1.992 - 1.996 mm)
53.971 - 53.980
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Piston and Connecting Rod
11B-23-9
<Selection by identification color>
Select appropriate connecting rod bearings through the
combination of the big end I.D. identification color marked
on each connecting rod and the appropriate pin O.D.
identification color on the crankshaft assembly *a as shown
in the table below.
F: Location of identification color
F
F
Compatible
connecting rod
bearing identification color
None (1)
None
Blue
Blue
None
None
None
Blue
Blue
The crankshaft assembly has additional pin O.D. identification
marks (“1” or “2”) stamped at G as shown. The 4 marks
apply to No. 1 pin, No. 2 pin and so forth sequentially from
the engine front to rear.
F
“1” or “2”
Identification
color on connecting rod
Blue (2)
F
F
Identification color on
crankshaft (Shown in
brackets is identification
mark)
H: Location of crankshaft journal O.D. identification mark
G
H
*a
INSPECTION
1. CONNECTING ROD BEARING
Caution
1. Do not use connecting rod bearings 2, 4 expanded
with force.
2. Replace the connecting rod bearing 2, 4 as a set
of upper and lower shells.
(1) Free Span
If the reading is less than the specified limit, replace the
connecting rod bearing 2, 4.
Limit: Less than 58.8 mm
2, 4
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-23-10
4M41 ENGINE - Piston and Connecting Rod
(2) Connecting Rod Bearing-to-Crankshaft Clearance
(Oil clearance)
1) Fit the lower connecting rod bearing shell 2 and upper
connecting rod bearing shell 4 in the connecting rod
cap 3 and the piston and connecting rod assembly
5, respectively. Tighten the nuts 1 to a torque of 49
± 5 Nm.
2) Measure the I.D. of the connecting rod bearing 2,
4 and the pin O. D. at A of the crankshaft *a. If
the readings exceed the specified limit, replace the
defective part(s).
5
4
3
2
1
*a
Standard value: 0.03 - 0.05 mm
Limit: 0.1 mm
3) When the connecting rod bearing 2, 4 is replaced
with an undersize bearing, adjust the pin O.D. of
the crankshaft *a to the specified undersize
dimension.
A
F
11
G
6, 7, 8
2. PISTON RING
(1) Piston Ring End Gap
1) Place the piston ring 6, 7, 8 level in the cylinder F
of the upper crankcase using the crown of the piston
11.
2) Holding the piston ring 6, 7, 8 in place, measure
its end gap with a feeler gauge G. If the reading
exceeds the specified limit, replace the piston ring.
Standard value:
1st compression ring
2nd compression ring
Oil ring
0.3 - 0.45 mm
0.4 - 0.55 mm
0.3 - 0.5 mm
Limit: 0.8 mm
Caution
1. To place the piston ring 6, 7, 8 level in the
cylinder F, be sure to use the piston 11.
2. Place the piston ring 6, 7, 8 at the lower part
of the cylinder F where the cylinder wall wears
less than elsewhere.
3. When it becomes necessary to replace any
of the piston rings 6, 7 and 8, replace all of
them as a set.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-23-11
4M41 ENGINE - Piston and Connecting Rod
(2) Piston Ring-to-Piston Ring Groove Clearance
1) If the measured clearance exceeds the specified limit,
replace the defective part.
11
6, 7, 8
Standard value:
1st compression ring
2nd compression ring
Oil ring
0.03 - 0.08 mm
0.07 - 0.10 mm
0.03 - 0.06 mm
Limit: 0.15 mm
NOTE
The 1st compression ring 6 is of full keystone type.
Measure the clearance with a feeler gauge G while
pressing the ring against the piston pin groove bottom
with a straight edge H.
G
11
Caution
1. Clear all carbon deposits from the ring groove
of the piston 11 and measure the clearance all
around the ring groove.
2. When it becomes necessary to replace any of
the rings 6, 7 and 8, replace all of them as a set.
H
6
4ME0454
3. PISTON PIN
(1) Measure the clearance between piston pin 10 and piston
11. If the reading exceeds the specified limit, replace
the defective part.
11
Standard value: 0.007 - 0.021 mm
Limit: 0.05 mm
10
(2) Measure the clearance between piston pin 10 and
connecting rod bush 13. If the reading exceeds the limit,
replace the defective part.
Standard value: 0.03 - 0.05 mm
10
Limit: 0.1 mm
13
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-23-12
4M41 ENGINE - Piston and Connecting Rod
4. CONNECTING ROD
(1) Fit the connecting rod bush 13 and piston pin 10 in the
connecting rod 15.
(2) Measure the bend A and twist B of the connecting rod
15. If either reading exceeds the specified limit, replace
the connecting rod.
A
C
100 mm
10
C: Connecting rod aligner (measuring device)
Limits:
Bend 0.05 mm
Twist 0.1 mm
Caution
1. Attach the connecting rod 15 to the connecting
rod aligner C with the upper and lower connecting
rod bearing shells installed in place.
2. Tighten the connecting rod cap nut to a torque
of 49 ± 5 Nm.
B
100 mm
C
10
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-24-1
4M41 ENGINE - Drive Plate
24. DRIVE PLATE
REMOVAL AND INSTALLATION
6
3
1
2
123 ± 12 Nm
4
5
4ME0598
Removal steps
1. Bolt
"AA 2. Adaptor plate
3. Drive plate assembly
AA" "BA 4. Ring gear
5. Drive plate
"AA 6. Crankshaft adaptor
4
A
REMOVAL SERVICE POINT
AA" RING GEAR REMOVAL
(1) Heat the ring gear 4 evenly using an acetylene torch
or any other suitable heat source.
Caution
Use care not to be burned.
(2) Remove the ring gear 4 by tapping it evenly all around.
5
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-24-2
4M41 ENGINE - Drive Plate
2
3
1
A
A
*
INSTALLATION SERVICE POINTS
"AA CRANKSHAFT ADAPTOR / ADAPTOR PLATE
INSTALLATION
Attach the adaptor plate 2 and the crankshaft adaptor 6 to
the drive plate assembly, facing in the directions A shown.
A: Drive plate side
6
4
A
"BA RING GEAR INSTALLATION
(1) Heat the ring gear 4 with an acetylene torch or any other
suitable heat source for 3 minutes. (Approx. 100°C)
Caution
Use care not to be burned.
(2) Fit the ring gear 4 onto the drive plate 5 with the
non-chamfered teeth side toward the drive plate.
5
A: Chamfered side of ring gear 4
INSPECTION
RING GEAR
Check the ring gear 4 for damage and abnormal wear. Replace
the ring gear 4 if necessary.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-25-1
4M41 ENGINE - Crank Shaft and Crank Case
25. CRANK SHAFT AND CRANK CASE
REMOVAL AND INSTALLATION
29
9
11
12
8
28
28
25
7
24
27
26
32 ± 3 Nm
10
6
23
47 ± 5 Nm
1
3
2
18
19
15
Apply engine oil to all
moving parts before
installation.
14
20 ± 2 Nm +
13
90_ + 90_
25 ± 3 Nm
5
4
21
22
16
20
17
4ME0599
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-25-2
"FA
"EA
"EA
AA" "DA
4M41 ENGINE - Crank Shaft and Crank Case
Removal steps
1. Bolt
2. Front plate
3. Stiffener
4. Stiffener RH
5. Stiffener LH
6. Bolt
7. Rubber spacer
8. Dust cover
9. Rear plate
10. Bolt
11. Rear oil seal
12. Rear oil seal case
13. Bolt
14. Main cap bolt
15. Lower crankcase assembly
"AA 16.
17.
"BA 18.
19.
AB" "CA 20.
21.
22.
"BA 23.
24.
"AA 25.
26.
27.
28.
29.
Lower main bearing
Lower crankcase
Lower thrust plate
Crankshaft assembly
Crankshaft gear
Key
Crankshaft
Upper thrust plate
Upper crankcase assembly
Upper main bearing
Check valve
Oil jet
O-ring
Upper crankcase
Caution
1. The lower crankcase 17 and upper crankcase 29 have been machined in a pair. Therefore,
replacing either one of the pair is not allowed.
2. The front plate 2 is held in position with the idler shaft, in addition to locating pin.
3. The main cap bolt 14 is tightened to a plastically deformed point. If it shows the evidence
of having been tightened three times, replace it.
4. Do not remove the crankshaft gear 20 unless absolutely necessary.
PRE-REMOVAL INSPECTION
CRANKSHAFT
Before removing the lower crankcase assembly 15, measure
the end play of the crankshaft assembly 19. If the reading
exceeds the specified limit, replace the thrust plate 18, 23
with an oversize one.
Standard value: 0.10 - 0.28 mm
Limit: 0.4 mm
<Available oversize thrust plates>
+0.15 mm, +0.30 mm, +0.45 mm
4
8 12
16 13
9
REMOVAL SERVICE POINTS
5 1
20
24
26
21
17
18
22
25
23
19
2
6 10 14 15
MH062469
11 7
3
AB" CRANKSHAFT GEAR REMOVAL
Using the special tool, remove the crankshaft gear 20.
A
20
E Mitsubishi Motors Corporation
AA" LOWER CRANKCASE ASSEMBLY CREMOVAL
(1) Gradually loosen the bolts 13 in the sequence of numbers
1 - 16 shown in the illustration.
(2) Then, gradually loosen the main bearing cap bolts 14
in the sequence of numbers 17 - 26 shown, and remove.
Feb. 2000
Caution
1. Before attaching the special tool, install a protective
bolt A (M16 x 1.5 mm ; 30 mm long) to the crankshaft
end so that the crankshaft will not be damaged by
the special tool.
2. Do not tap on the crankshaft gear 20 to remove it.
PWEE9409-D
Added
4M41 ENGINE - Crank Shaft and Crank Case
INSTALLATION SERVICE POINTS
29
22
H
A
17
14
<No.3 >
25
16
Caution
Tighten the main bearing cap bolts 14 by specified
procedure before measuring the bearing mounting
hole I.D. of the crankcase assembly 17, 29.
<No.1, 2, 4, 5>
J
J
"AA MAIN BEARING INSTALLATION
The main bearings 16 and 25 must have a proper plate
thickness that matches the difference between the bearing
mounting hole I.D. of the crankcase assembly 17, 29 and
the journal O.D. of the crankshaft 22.
(1) Measure the bearing mounting hole I.D. of the crankcase
assembly 17, 29 and the journal O.D. of the crankshaft
22.
A: Measuring point (One point in vertical direction for
crankcase)
K
B K
J
H
L
D F
C EG
<No.1, 2, 4, 5>
11B-25-3
<No.3 >
J
NOTE
(1) The bearing mounting hole I.D. of the crankcase 17,
19 can be known by the identification mark B on
the right side of the crankcase rear end.
C: No. 1 journal, D: No. 2 journal
E: No. 3 journal, F: No. 4 journal
G: No. 5 journal
(2) The journal O.D. of the crankshaft 22 can be identified
by the identification color on the crankshaft.
H: Identification color position
(2) Select appropriate thickness main bearings 16, 25 from
the following table.
J: Identification color position
K: Lug
L: Oil hole
Caution
The main bearing shells 16 and 25 must be installed
in the specified direction. The main bearing shells
for No. 3 journal are different in thickness from the
others. The upper main bearing shell for No. 3 journal
is different also in shape from the others.
Unit: mm
Crankcase
Crankshaft
Main bearing
Identification
color
Journal
O.D.
Size
mark
Bearing
mounting
hole I.D.
Identification color
(L/U)
Journal No.
Plate
Thickness
Oil Clearance
None
67.970 67.798
A
72.010 72.019
Black/Black
No.1, 2, 4, 5
1.992 - 1.996
0.040 - 0.065
No.3
1.982 - 1.986
0.060 - 0.085
72.000 72.010
Blue/Blue
No.1, 2, 4, 5
1.988 - 1.992
0.038 - 0.064
No.3
1.978 - 1.982
0.058 - 0.084
72.010 72.019
Yellow/Yellow
No.1, 2, 4, 5
1.996 - 2.000
0.040 - 0.066
No. 3
1.986 - 1.990
0.060 - 0.086
72.010 72.019
Black/Black
No.1, 2, 4, 5
1.992 - 1.996
0.038 - 0.065
No.3
1.982 - 1.986
0.058 - 0.085
B
Blue
67.961 67.970
A
B
L: Lower main bearing shell U: Upper main bearing shell
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-25-4
4M41 ENGINE - Crank Shaft and Crank Case
"BA THRUST PLATE INSTALLATION
Install the thrust plates 18 and 23 to the crankshaft assembly
19 at No.5 journal only. Install all halves of the thrust plates
with the oil groove A oriented outward.
A
23
A
19
A
18
20
A
"CA CRANKSHAFT GEAR INSTALLATION
(1) Before installing, heat the crankshaft gear 20 to
approximately 100_C with a piston heater or the like.
21
B
Caution
If any oversize thrust plates are to be used, be sure to
use an upper thrust plate 23 and lower thrust plate 18
of the same size at one side. However, using the same
size upper (or lower) thrust bearings on both sides is
not necessary.
Caution
Use care not to be burned.
(2) Align the notch B in the crankshaft gear 20 with the key
21 of the crankshaft 22, then install the crankshaft gear
20 onto the crankshaft by tapping on the end face lightly
with a plastic hammer.
22
"DA LOWER CRANKCASE ASSEMBLY INSTALLATION
14
A
Caution
Before installing the lower crankcase assembly 15, check
the head of the main cap bolt 14 for punch marks A.
The number of punch marks corresponds to the number
of times the bolt has been tightened to the plastic area
(bolts with two or less punch marks are reusable). If there
are three, replace the main cap bolt 14.
(1) Apply a 2 mm thick bead of specified sealant to the fitting
surface of the upper crankcase assembly 24 as shown.
24
Specified sealant:
Mitsubishi Genuine
equivalent
Part
No.
MD970389
or
Caution
1. Apply sealant evenly, not broken or oversupplied.
2. Use care not to let the applied sealant slip out
of place during installation.
13
9
5
1
4
8
12
16
23
19
17
22
26
25
21
18
20
24
15
11 7
3
2
E Mitsubishi Motors Corporation
6 10
14
Feb. 2000
(2) Apply a thin coat of engine oil to the threaded part and
seating surface of each main cap bolt 14, then tighten
the bolts to a torque of 20 ± 2 Nm in the sequence of
the numbers shown (17 - 26).
(3) After tightening, give the bolts an additional 90_ turn.
(4) Then, give the bolts another 90_ turn to tighten them
completely.
(5) Following the main cap bolts 14, tighten the bolts 13
to the specified torque in the sequence of the numbers
shown (1 - 16).
(6) After installing the lower crankcase assembly 15, check
the following:
1) Smooth rotation of crankshaft assembly 19
2) End play of the crankshaft assembly 19
PWEE9409-D
Added
11B-25-5
4M41 ENGINE - Crank Shaft and Crank Case
11
B
C
12 A
"EA REAR OIL SEAL / REAR OIL SEAL CASE
INSTALLATION
(1) Apply a thin coat of engine oil to the lip A of the rear
oil seal 11. Press the rear oil seal all the way into the
rear oil seal case 12 in the direction shown. Be sure
that the end face B of the rear oil seal is flush with the
end face C of rear oil seal case.
(2) Apply a 3 mm thick bead of the specified sealant to the
fitting surface of the rear oil seal case 12.
Specified sealant:
Mitsubishi Genuine
equivalent
Part
No.
MD970389
or
Caution
1. Apply the sealant evenly, not broken or
oversupplied.
2. Use care not to let the applied sealant slip out
of place during installation.
24
"FA FRONT PLATE INSTALLATION
Apply a 2 mm thick bead of the specified sealant to the lower
crankcase assembly 15 and upper crankcase assembly 24
where indicated in the illustration.
Specified sealant:
Mitsubishi Genuine
equivalent
15
Part
No.
MD970389
or
Caution
1. Apply the sealant evenly, not broken or
oversupplied.
2. Use care not to let the applied sealant slip out
of place during installation.
3. The bolt 1 that holds the front plate 2 is also used
to secure the timing gear case. Attach the front
plate with a temporary bolt until the timing gear
case is installed.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-25-6
4M41 ENGINE - Crank Shaft and Crank Case
INSPECTION
1. MAIN BEARINGS
Caution
1. Be sure not to use the main bearings 16 and 25
expanded forcedly.
2. When either the main bearing 16 or 25 is defective,
replace them in pairs.
(1) Free Span
If the reading for either main bearing shell 16, 25 exceeds
the specified service limit, replace them in pairs.
Limit: Less than 73.16 mm
16, 25
25
29
16
14
22
A
22
17
M
B
(2) Main Bearing-to-Crankshaft Clearance
1) Fit the upper main bearing shells 25 and lower main
bearing shells 16 into the upper crankcase 29 and
lower crankcase 17 respectively, then tighten main
cap bolts 14 to a torque of 20 ± 2 Nm.
2) Measure the I.D. of the main bearings 16, 25 and
the journal O.D. at M of the crankshaft 22. If the
measurements exceed the specified limits, replace
the defective part(s).
Standard value:
No. 1, 2, 4, 5 journal
No. 3 journal
0.04 - 0.06 mm
0.06 - 0.08 mm
Limit: 0.1 mm
2. CRANKSHAFT
(1) Out-of-Roundness and Conicity of Crankshaft Journal
and Pin
If the measured value exceeds the limit, replace the
crankshaft 22.
A: Out-of-Roundness
B: Conicity
E Mitsubishi Motors Corporation
Standard value:
Out-of-Roundness
Conicity
Feb. 2000
PWEE9409-D
0.01 mm or less
0.006 mm or less
Added
4M41 ENGINE - Crank Shaft and Crank Case
22
E
D
C
11B-25-7
(2) Bend
1) To measure the bend of the crankshaft 22, support
it at No. 1 journal C and No. 5 journal D and read
the runout at No. 3 journal E.
2) If the reading exceeds the specified service limit,
replace the crankshaft 22.
Standard value: 0.02 mm or less
Limit: 0.05 mm
NOTE
The bend of the crankshaft 22 is a half of the dial gauge
reading obtained when the crankshaft is rotated one turn.
3. UPPER CRANKCASE
(1) Top Surface Distortion
If the reading exceeds the specified limit, eliminate
distortion using a surface grinder.
A
A: Measuring direction
Standard value: 0.05 mm or less
Limit: 0.1 mm
Caution
The surface grinding of the upper crankcase 29 should
be limited to such an extent that piston protrusions
do not deviate from specified standard value.
Cylinder
20 mm
80 mm
A B
(2) Cylinder Inside Diameter
If the cylinder inside diameter exceeds the specified limit,
bore the cylinder to the next oversize.
Standard value: 98.5 - 98.53 mm
Limit: 98.75 mm
130 mm
A: Measuring direction in cylinder
(axial direction of crankshaft)
B: Measuring direction in cylinder
(right angled to crankshaft)
C: Measuring direction on piston
(right angled to piston pin hole)
53.5 mm
C
E Mitsubishi Motors Corporation
Feb. 2000
Caution
1. If any of the cylinders exceeds the limit, bore all
the cylinders to the next oversize.
2. Irrespective of the cylinder I.D. being within the
specified limit, replace the piston and piston rings
if the cylinder-to-piston clearance deviates from
the standard value.
PWEE9409-D
Added
11B-25-8
4M41 ENGINE - Crank Shaft and Crank Case
53.5 mm
C
4. CYLINDER BORING
(1) Determine the oversize piston to be used based on the
largest cylinder inside diameter.
(2) There are two types of oversize pistons available (+0.50
mm and +1.00 mm). Bore the cylinders so that the
clearance between the cylinder and the piston installed
meets the specified standard value. The reference point
for piston O.D. measurement is as shown.
Standard value: 0.04 - 0.05 mm
(3) Based on the measured piston outside diameter, calculate
the necessary boring dimension as follows.
D Boring dimension = Piston O.D. + 0.04 to 0.05 mm
(piston-to-cylinder clearance) - 0.05 mm (honing
allowance)
(4) Grind each cylinder to the calculated boring dimension.
Caution
1. Because of the hardened cylinder layer, the use
of a BORAZON TIP is recommended.
2. To avoid thermal distortion, bore the cylinders
in the order of No. 2, No. 4, No. 1 and No. 3.
(5) Hone each cylinder to the final bore (piston O.D. +
piston-to-cylinder clearance).
NOTE
(1) Honed surface roughness: 2 to 4 mm
(2) Honing crosshatch angle: 15 to 25_ (half angle)
(3) Cylinder bore out-of-squareness: 0.05 mm
(6) Check that the piston-to-cylinder clearance is within the
specified standard value range.
Standard value: 0.04 - 0.05 mm
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Balance Shaft Bush
11B-26-1
26. BALANCE SHAFT BUSH
REMOVAL AND INSTALLATION
1
1
4ME0600
Removal steps
AA" "AA 1. Balance shaft bush
REMOVAL SERVICE POINT
E
D
F
A
G
C
B
AA" BALANCE SHAFT BUSH REMOVAL
Using the special tool, remove the balance shaft bush 1 in
the following manner:
Component Parts of Special Tool MH062490 - Balance Shaft
Bush Remover
A: Nut
B: Washer
C: Remover
D: Puller
E: Plate
F: Washer
G: Nut
Caution
Apply engine oil to the sliding surface of plate E and
puller D.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-26-2
4M41 ENGINE - Balance Shaft Bush
E
D
G F
C
B
1
*a
H
E
J
H
J
E
1
G
(1) Set the tools as shown by passing the remover C, through
the balance shaft bush 1 while tilting it as shown.
(2) Pull the puller D to bring the washer B into contact with
the remover C. Then, turn in the nut G until the plate
B is lightly pressed by it.
(3) Secure the plate E to the crankcase using bolt J.
H: Dowel pin
J: Bolt (M8 x 1.25 mm)
Caution
The securing position of the plate E is different
between when removing the left-hand and right-hand
balance shaft bushes 1. Be sure to secure it in right
places.
(4) Tighten the nut G further to remove the balance shaft
bush 1.
INSTALLATION SERVICE POINT
N
M
L
K
"AA BALANCE SHAFT BUSH INSTALLATION
Using the special tool, install the balance shaft bushes 1
in the following manner:
Component Parts of Special Tool MH062717 - Balance Shaft
Bush Installer
K: Installer
L: Plate
M: Washer
N: Nut
Caution
Apply engine oil to the sliding surfaces of the installer
K and plate L.
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
4M41 ENGINE - Balance Shaft Bush
P
R
S
1
(1) Fit the balance shaft bush 1 onto the installer K from
the non-chamfered side. At this time, align the oil hole
with the alignment mark P “ - ” on the installer.
Align the oil hole Q of the left-hand bush with the “L”-line
of the installer and the oil hole R of the right-hand bush
with the “R”-line.
P:
Q:
R:
S:
Q
11B-26-3
Alignment mark P “ - ” (installer)
Oil hole (left-hand bush)
Oil hole (right-hand bush)
Chamfered side
Caution
Before installing the balance shaft bush 1 onto the
installer K, apply chassis grease to the inside surface
of the bush so that the oil hole Q, R does not slip
out of position.
E
(2) Secure the plate E to the crankcase using bolt J as shown.
*a
J
H
H
J
Caution
1. Note that the securing position of the plate N is
different between the left-hand balance shaft bush
and the right-hand bush.
2. Prior to securing the plate E, check that the
installer K is correctly positioned with respect
to the balance shaft bush 1.
E
(3) Line up the alignment mark P “ - ” on the installer K and
the alignment mark T “ - ” on the algnment mark plate
L.
K
L
T: Alignment mark “ - ” (plate)
T
K
L
T
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added
11B-26-4
4M41 ENGINE - Balance Shaft Bush
K
N
1
P
U
N
N M
(4) Screw the nut N onto the installer K up to its alignment
mark P “ - ” to predetermine the press-fitting depth of the
balance shaft bush 1.
(5) Strike on the installer K until the nut N positively contacts
the washer M to press-fit the balance shaft bush 1 into
the crankcase.
(6) Check that the oil hole Q, R of the balance shaft bush
1 is in alignment with the oil hole U in the crankcase.
U: Oil hole (crankcase)
*a Q, R
INSPECTION
1
BALANCE SHAFT BUSH
Measure the clearance between balance shaft bush 1 and
balance shaft *b. If the reading exceeds the specified limit,
replace the defective part(s).
Standard value: 0.06 - 0.11 mm
Limit: 0.16 mm
1
*b
E Mitsubishi Motors Corporation
Feb. 2000
PWEE9409-D
Added