Mitsubishi Evolution X. Manual - part 177

CAMSHAFT

TSB Revision

ENGINE MECHANICAL

11A-39

CAUTION

• When inserting special tool MB992103 into the timing 

chain case assembly, pay attention to the position of 
the timing chain to avoid damage to the timing chain 
and timing chain tension side guide. Do not insert the 
special tool beyond its insertion guideline.

• If unlocking the timing chain tensioner is insufficient, 

the special tool cannot be inserted to the insertion 
guideline. Do not insert the special tool forcibly, follow 
Step 2 again to unlock the timing chain tensioner and 
insert the special tool.

CAMSHAFT

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ENGINE MECHANICAL

11A-40

3. With the timing chain tensioner unlocked, insert special tool 

MB992103 inside the timing chain case assembly along the 
tension side of the timing chain until the insertion guide line 
aligns with the upper surface of the timing chain case 
assembly (Figure A). 
NOTE: With the timing chain tensioner unlocked, insert the 
special tool along the tension side of the timing chain, 
according to the special tool top shape. The special tool can 
be inserted smoothly to the position where the special tool 
insertion guideline aligns with the timing chain case assem-
bly top surface, and the spread timing chain tension side 
guide can be hold.

4. With the special tool inserted up to the insertion guide line, 

press the special tool against the intake side camshaft 
sprocket (Figure B) and spread and hold the timing chain 
tension side guide (Figure C).

5. Remove the flat-tipped precision screwdriver unlocking the 

timing chain tensioner.

6. Pull up the camshaft and camshaft sprocket assembly 

(exhaust side) mounting area of the timing chain (Figure D) 
to provide allowance for easy installation of the camshaft 
and camshaft sprocket assembly (exhaust side) to the 
timing chain.

AC705456AC

Timing chain

MB992103

Insertion standard line

AC509177

AC508125

AD

MB992103

MB992103

Timing chain
tensioner

Timing chain
tension side guide

Timing chain
tension 
side guide

Timing chain
(tension side)

Camshaft
sprocket
(intake side)

Timing chain
(exhaust camshaft and
camshaft sprocket
assembly side)

A

B

C

D

CAMSHAFT

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ENGINE MECHANICAL

11A-41

CAUTION

When installing the camshaft and camshaft sprocket 
assembly (exhaust side), be careful not to let the camshaft 
bearing which is installed to the front cam bearing deviate 
from its position.
7. Align the exhaust side paint mark of the timing chain which 

was put at removal with the paint mark of the exhaust side 
camshaft sprocket, and install the timing chain to the 
camshaft sprocket.

8. Install the camshaft and camshaft sprocket assembly 

(exhaust side) to the cylinder head.

9. Remove the special tool inserted into the timing chain case 

assembly inside.

.

>>F<< FRONT CAMSHAFT BEARING CAP 
ASSEMBLY INSTALLATION

CAUTION

When the mounting bolts are tightened with the front cam-
shaft bearing cap tilted, the front camshaft bearing cap is 
damaged. Install the front camshaft bearing cap properly 
to the cylinder head and camshaft.
1. Install the front camshaft bearing cap to the cylinder head, 

and temporarily tighten the camshaft bearing front cap to the 
specified torque in the order of the figure (1).

Tightening torque: 17 

± 3 N⋅ m (13 ± 2 ft-lb)

2. Tighten the front camshaft bearing cap again to the specified 

torque in the order of the figure (2).

Tightening torque: 30 

± 2 N⋅ m (23 ± 1 ft-lb)

3. After installing the front camshaft bearing cap, check that the 

paint marks of camshaft sprocket and of timing chain, the 
timing mark of crankshaft pulley, and the T-mark position of 
ignition timing indicator are aligned correctly.

.

>>G<< ROCKER COVER ASSEMBLY 
INSTALLATION

1. Wipe off the sealant on the mating surface of the rocker 

cover assembly and the cylinder head and timing chain case 
assembly, and degrease the surface where the sealant is 
applied by white gasoline or the like.

AC506752

AB

Paint markings
(exhaust side)

AC511062

AC

4

3

2

1

4

3

2

1

(1)

(2)

Engine front

Front 
camshaft
bearing
cap
assembly

CAMSHAFT

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ENGINE MECHANICAL

11A-42

2. Apply sealant to the joint between the cylinder head and 

timing chain case assembly as shown in the figure and 
install the rocker cover assembly to the cylinder head.

Specified sealant: Three bond 1217G or equivalent

NOTE: Install the rocker cover assembly within 3 minutes 
after the application of sealant.

3. Tighten the rocker cover assembly mounting bolts to the 

specified torque in the order of number shown in the figure.

Tightening torque: 3.0 

± 1.0 N⋅ m (27 ± 8 in-lb)

4. Tighten again the rocker cover assembly mounting bolts to 

the specified torque in the order of number shown in the 
figure.

Tightening torque: 5.5 

± 0.5 N⋅ m (49 ± 4 in-lb)

AC506753

AF

Cylinder head

Timing chain case assembly

φ 4 mm
(

φ 0.14 in)

φ 4 mm
(

φ 0.14 in)

AC506743

AE

3

6

1

9

5

10

4

8

7

11

13

14

15

16

17

18

2

12

Engine front