Mitsubishi Evolution X. Manual - part 200

CYLINDER HEAD AND VALVES

TSB Revision

ENGINE OVERHAUL

11B-47

CYLINDER HEAD AND VALVES

REMOVAL AND INSTALLATION

M1113006902039

AK702226

1

3

4

5

6

7

8

9

10

11

12

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14

15

16

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18

19

20

35 ± 2 N·m
26 ± 1 ft-lb

AC

21

Apply engine oil to
all moving parts
before installation.

→ +90˚ → +90˚

35 ± 2 N·m
26 ± 1 ft-lb

2

→ +90˚ → +90˚

Removal steps 

>>E<<

1. Cylinder head bolt

>>E<<

2. Cylinder head bolt washer

>>E<<

3. Cylinder head bolt & washer 

assembly

>>D<<

4. Cylinder head assembly

>>D<<

5. Cylinder head gasket
6. Engine oil control valve (OCV) filter

<<A>> >>C<<

7. Retainer lock
8. Valve spring retainer

9. Valve spring
10. Intake valve

<<A>> >>C<<

11. Retainer lock
12. Valve spring retainer

>>B<<

13. Valve spring
14. Exhaust valve

<<B>> >>A<<

15. Valve stem seal

<<B>> >>A<<

16. Valve stem seal
17. Intake valve guide

Removal steps (Continued)

CYLINDER HEAD AND VALVES

TSB Revision

ENGINE OVERHAUL

11B-48

Required Special Tools:

• MD998735: Valve Spring Compressor

• MB992089: Retainer Holder

• MB992085: Valve Stem Seal Pliers

• MD998737: Valve Stem Seal Installer

REMOVAL SERVICE POINTS

.

<<A>> RETAINER LOCK REMOVAL

AK502741AD

MB992089

MD998735

CAUTION

Be careful not to allow retainer holder C to interfere with 
the wall of the tappet hole and to damage it.
Use a special tool MD998735 and MB992089 to compress the 
valve spring and to remove the retainer lock.
NOTE: Store removed parts such as valves and springs with 
tags describing cylinder No. and installed position attached for 
reassembly.

.

<<B>> VALVE STEM SEAL REMOVAL

AK502782AD

Valve stem seal

MB992085

Use special tool MB992085 to firmly pinch the base (larger 
external shape) of the stem seal and twist it right and left for 
pulling out.

18. Exhaust valve guide
19. Intake valve seat
20. Exhaust valve seat
21. Cylinder head

Removal steps (Continued)

CYLINDER HEAD AND VALVES

TSB Revision

ENGINE OVERHAUL

11B-49

INSTALLATION SERVICE POINTS

.

>>A<< VALVE STEM SEAL INSTALLATION

CAUTION

• The valve stem seal must not be reused.
• Do not damage the tappet wall during assembly.
• Be sure to use a special tool to install the valve stem 

seal. Poor installation causes oil loss via valve guides.

•

AK503378 AE

If oil is not applied, the valve stem seal may rise to the 
surface after it is press fitted.

1. Apply a thin coat of engine oil to a new valve stem seal.

AK502742AD

MD998737

2. Use special tool MD998737 to press fit the valve stem seal 

into the valve guide with the valve stem used as a guide.

.

>>B<< VALVE SPRING INSTALLATION

AK502553

Paint mark position

AD

Install the valve spring so that the painted side faces toward the 
camshaft.

.

CYLINDER HEAD AND VALVES

TSB Revision

ENGINE OVERHAUL

11B-50

>>C<< RETAINER LOCK INSTALLATION

AK502741AD

MB992089

MD998735

Use a special tool MD998735 and MB992089 to compress the 
valve spring and to install the retainer lock.

.

>>D<< CYLINDER HEAD GASKET / CYLINDER 
HEAD ASSEMBLY INSTALLATION

AK602902AD

Top face of cylinder block 

Degreasing

Degreasing

Bottom face of cylinder head 

1. Completely remove the liquid gasket on the upper plane of 

the cylinder block and the lower plane of the cylinder head.

CAUTION

Sufficiently check that there is no residual oil on the place 
where degreasing is performed. If fingerprints are left, do 
not touch it with bare hands after the degreasing, since the 
oils from your fingers will harm the seal ability.
2. Using white gasoline and so on, degrease the place 

specified in the illustration.