Mitsubishi Evolution X. Manual — part 178
VALVE STEM SEAL
TSB Revision
ENGINE MECHANICAL
11A-43
VALVE STEM SEAL
REMOVAL AND INSTALLATION
M1112008100472
CAUTION
*Remove and assemble the marked parts in each cylinder unit.
Pre-removal operation
• Engine Room Under Cover Front A, B, Engine Room
Under Cover Center and Engine Room Side Cover (RH)
Removal (Refer to GROUP 51, Under Cover
• Engine Oil Draining (Refer to GROUP 12, On-vehicle Ser-
vice
− Engine Oil Replacement
).
• Rocker Cover Assembly Removal (Refer to
).
• Engine Oil Pan Removal (Refer to
• Timing Chain Removal (Refer to
Post-installation operation
• Timing Chain Installation (Refer to
• Engine Oil Pan Installation (Refer to
• Valve Clearance Check (Refer to
• Rocker Cover Assembly Installation (Refer to
).
• Engine Oil Refilling (Refer to GROUP 12, On-vehicle Ser-
vice
− Engine Oil Replacement
).
• Engine Room Under Cover Front A, B, Engine Room
Under Cover Center and Engine Room Side Cover (RH)
Installation (Refer to GROUP 51, Under Cover
AC704356
6
3
11
AC
7
12
13
1
4
5
10
9
14
N
N
2
8
15*
16*
17*
18*
19*
15*
16*
17*
18*
19*
18 ± 2 N·m
13 ± 2 ft-ib
Apply engine oil to all
moving parts before
installation.
12 ± 1 N·m
107 ± 8 in-lb
17 ± 3 N·m
13 ± 2 ft-lb
to
30 ± 2 N·m
23 ± 1 ft-lb
12 ± 1 N·m
107 ± 8 in-lb
Removal steps
<<
A
>>
>>
G
<< 1.
Front camshaft bearing cap
assembly
>>
F
2.
Camshaft bearing
<<
B
>>
>>
E
3.
Oil feeding camshaft bearing cap
(exhaust side)
<<
B
>>
>>
E
4.
Camshaft bearing cap (exhaust
side)
<<
B
>>
>>
E
5.
Camshaft bearing cap (exhaust
side)
<<
B
>>
>>
E
6.
Thrust camshaft bearing cap
(exhaust side)
>>
F
<<
7.
Camshaft and camshaft sprocket
assembly (exhaust side)
>>
F
<<
8.
Camshaft bearing
<<
B
>>
>>
E
9.
Oil feeding camshaft bearing cap
(intake side)
<<
B
>>
>>E<<
10. Camshaft bearing cap (intake side)
<<
B
>>
>>
E
11. Camshaft bearing cap (intake side)
Removal steps (Continued)
VALVE STEM SEAL
TSB Revision
ENGINE MECHANICAL
11A-44
Required Special Tools:
• MD998772: Valve Spring Compressor
• MB992089: Retainer Holder C
• MB992090: Retainer Holder Attachment
• MB992085: Valve Stem Seal Pliers
• MD998737: Valve Stem Seal Installer
REMOVAL SERVICE POINTS
.
<<A>> FRONT CAMSHAFT BEARING CAP
ASSEMBLY REMOVAL
CAUTION
Be careful not to drop the camshaft bearing.
Loosen the mounting bolts of front camshaft bearing cap in the
order of number shown in the figure, and remove the front cam-
shaft bearing cap assembly.
.
<<
B
>>
>>
E
12. Thrust camshaft bearing cap
(intake side)
13. Camshaft and camshaft sprocket
assembly (intake side)
14. Spark plug
<<
C
>>
>>
D
<<
15. Valve tappet
<<
D
>>
>>
C
<<
16. Valve spring retainer lock
17. Valve spring retainer
>>
B
<<
18. Valve spring
<<
E
>>
A
<<
19. Valve stem seal
Removal steps (Continued)
AC506745
AD
1
2
3
4
Engine front
Front camshaft
bearing cap
assembly
VALVE STEM SEAL
TSB Revision
ENGINE MECHANICAL
11A-45
<<B>> OIL FEEDING CAMSHAFT BEARING
CAP/CAMSHAFT BEARING CAP/THRUST
CAMSHAFT BEARING CAP REMOVAL
CAUTION
When the camshaft bearing cap mounting bolts are loos-
ened at once, the mounting bolts jump out by the spring
force and the threads are damaged. Always loosen the
mounting bolts in four or five steps.
Loosen the mounting bolts of the camshaft bearing caps in the
order of number shown in the figure in four or five steps, and
remove the camshaft bearing caps.
.
<<C>> VALVE TAPPET REMOVAL
CAUTION
• Do not use pliers or other tools to remove the valve tap-
pets. Always remove them by hand.
• When reusing the removed valve tappet, it has to be
installed in the same position as before. Be sure to put
a tab that shows the original installation position on the
valve tappet when storing it.
Remove all of the valve tappets by hand.
.
AC506746
AC
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
Engine front
Camshaft bearing cap
Camshaft bearing cap
AC509270
AC
Valve tappet
VALVE STEM SEAL
TSB Revision
ENGINE MECHANICAL
11A-46
<<D>> VALVE SPRING RETAINER LOCK
REMOVAL
1. Screw in special tool MB992090 to special tool MD998772
and assemble special tool MB992089.
CAUTION
When removing the valve spring retainer lock, leave the
piston of the cylinder in the TDC (Top Dead Center) posi-
tion. The valve may fall into the cylinder if the piston is not
properly in the TDC position.
2. Install special tool MD998772 (with special tools MB992090
and MB992089 attached) to the cylinder head and compress
the valve spring. Then, remove the valve spring retainer
lock.
.
<<E>> VALVE STEM SEAL REMOVAL
Use special tool MB992085 to grip the base of the stem seal
(where the outside diameter is larger) securely, and remove it
by twisting it to the left and right.
AC509271
AC
MD998772
MB992090
MB992089
AC608112 AB
Valve stem seal
MB992085
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