Mitsubishi Montero (2002-2004). Manual — part 448

ROCKER ARMS AND CAMSHAFT

TSB Revision

ENGINE OVERHAUL

11B-25

ROCKER ARM
1. Check the roller surface and replace the rocker arm if

recesses, damage or heat seizure is observed.

2. Check roller rotation and replace the rocker arm if uneven

rotation or roller backlash of the roller is observed.

3. Check the inside diameter and replace the rocker arm if

damage or seizure is observed.

.

CAMSHAFT
1. Check the camshaft bearing journals for damage and

binding. If the journals are binding, check the cylinder head
for damage. Also check the cylinder head for clogged oil
holes.

2. Check the tooth surface of the distributor drive gear teeth of

the camshaft and replace if abnormal wear is evident.

3. Check the cam surface for abnormal wear and damage and

replace if necessary. Also measure the cam height and
replace if out of minimum limit.

Standard value:
Intake 37.39 mm (1.472 inches)
Exhaust 37.14 mm (1.462 inches)
Minimum limit:
Intake 36.89 mm (1.452 inches)
Exhaust 36.64 mm (1.443 inches)

.

LASH ADJUSTERS

CAUTION

• The lash adjusters are precision-engineered mecha-

nisms. Do not allow them to become contaminated by
dirt or other foreign substances.

• Do not attempt to disassemble the lash adjusters.
• Use only fresh diesel fuel to clean the lash adjusters.

1. Prepare three containers and approximately 5 dm

3

(30.5

quart) of diesel fuel. Into each container, pour enough diesel
fuel to completely cover a lash adjuster when it is standing
upright. Then, perform the following steps with each lash
adjuster.

AKX00723

ROLLER TIP

AB

AKX00685

AKX00625

OUTSIDE
CLEANING

INSIDE
CLEANING

FILLING
DIESEL FUEL

A

B

C

AB

ROCKER ARMS AND CAMSHAFT

TSB Revision

ENGINE OVERHAUL

11B-26

2. Place the lash adjuster in container A and clean its outside

surface.
NOTE: Use a nylon brush if deposits are hard to remove.

CAUTION

The steel ball spring is extremely weak, so the lash
adjuster's functionality may be lost if the air bleed wire is
pushed in hard.
3. While gently pushing down the internal steel ball using wire

[0.5 mm (0.020 inch) in diameter] or special tool MD998442,
move the plunger through five to ten strokes until it slides
smoothly. In addition to eliminating stiffness in the plunger,
this operation will remove dirty oil.
NOTE: If the plunger remains stiff or the mechanism
appears otherwise abnormal, replace the lash adjuster.

4. Remove the lash adjuster from the container. Then, push

down the steel ball gently and push the plunger to eliminate
diesel fuel from the pressure chamber.

CAUTION

The steel ball spring is extremely weak, so the lash
adjuster's functionality may be lost if the air bleed wire is
pushed in hard.
5. Place the lash adjuster in container B. Then, gently push

down the internal steel ball using a wire [0.5 mm (0.020
inch) in diameter] or special tool MD998442 and move the
plunger through five to ten strokes until it slides smoothly.
This operation will clean the lash adjuster's pressure
chamber.

6. Remove the lash adjuster from the container. Then, push

down the steel ball gently and push the plunger to eliminate
diesel fuel from the pressure chamber.

AKX00626

DIESEL
FUEL

AB

AKX00628

WIRE OR MD998442

DIESEL FUEL

AB

AKX00629

DIESEL FUEL

AB

WIRE OR MD998442

AKX00628

WIRE OR MD998442

DIESEL FUEL

AB

AKX00629

DIESEL FUEL

AB

WIRE OR MD998442

ROCKER ARMS AND CAMSHAFT

TSB Revision

ENGINE OVERHAUL

11B-27

CAUTION

Do not use container C for cleaning. If cleaning is per-
formed in container C, foreign matter could enter the pres-
sure chamber when the chamber is filled with diesel fuel.
7. Place the lash adjuster in container C. Then, gently push

down the internal steel ball using a wire [0.5 mm (0.020
inch) in diameter] or special tool MD998442.

8. Stand the lash adjuster with its plunger at the top, then push

the plunger downward firmly until it moves through its
greatest possible stroke. Return the plunger slowly, then
release the steel ball and allow the pressure chamber to fill
with diesel fuel.

9. Remove the lash adjuster from the container, then stand the

lash adjuster with its plunger at the top. Push the plunger
firmly and check that it does not move.
NOTE: If the lash adjuster contracts or moves, perform the
operations (7) through (9) again to fill it with diesel fuel com-
pletely. Replace the lash adjuster if it still contracts or moves
after performing these steps.

10.Stand the lash adjuster upright to prevent diesel fuel from

spilling out. Do not allow the lash adjuster to become
contaminated by dirt or other foreign matter. Fit the lash
adjuster onto the engine as soon as possible.

AKX00630

WIRE OR MD998442

DIESEL FUEL

AB

AKX00631

WIRE OR MD998442

DIESEL
FUEL

AB

AKX00627

CYLINDER HEAD AND VALVES

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ENGINE OVERHAUL

11B-28

CYLINDER HEAD AND VALVES

REMOVAL AND INSTALLATION

M1113006900301

AKX00644

108 ± 5 N·m
80 ± 4 ft-lb
TO
BACK OFF
TO
108 ± 5 N·m
80 ± 4 ft-lb

1

5

2

6

7

13

3

14

9

11

16

17

12

10

21

18

22

20

8

4

AD

APPLY ENGINE OIL
TO ALL MOVING
PARTS BEFORE
INSTALLTION.

15

19

REMOVAL STEPS

<<A>> >>D<<

1. CYLINDER HEAD BOLT
2. WASHER
3. CYLINDER HEAD ASSEMBLY
4. CYLINDER HEAD GASKET

<<B>> >>C<<

5. RETAINER LOCK
6. VALVE SPRING RETAINER

>>B<<

7. VALVE SPRING
8. INLET VALVE

<<B>> >>C<<

9. RETAINER LOCK
10. VALVE SPRING RETAINER

>>B<<

11. VALVE SPRING

12. EXHAUST VALVE

>>A<<

13. VALVE STEM SEAL
14. VALVE SPRING SEAT

>>A<<

15. VALVE STEM SEAL
16. VALVE SPRING SEAT
17. INLET VALVE GUIDE
18. SNAP RING
19. EXHAUST VALVE GUIDE
20. INLET VALVE SEAT
21. EXHAUST VALVE SEAT
22. CYLINDER HEAD

REMOVAL STEPS (Continued)