Mitsubishi Evolution X. Manual - part 175

CAMSHAFT

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ENGINE MECHANICAL

11A-31

2. 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 guide line aligns with the timing chain case assem-
bly top surface (Figure B), and the spread timing chain ten-
sion side guide can be held (Figure C).

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

press the special tool against the intake side camshaft 
sprocket and spread and hold the timing chain tension side 
guide.

4. Remove the flat-tipped precision screwdriver unlocking the 

timing chain tensioner.

AC705456AC

Timing chain

MB992103

Insertion standard line

AC508123

AC509159AB

MB992103

MB992103

Timing chain tensioner

Timing chain tension
side guide

Timing chain
tension
side guide

Camshaft
sprocket
(intake side)

Valve timing chain
(tension side)

A

B

C

CAMSHAFT

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ENGINE MECHANICAL

11A-32

CAUTION

The timing chain may snag on by other parts. After sag-
ging the timing chain, never rotate the crankshaft.
5. With the timing chain tension side guide spread, hook the 

special tool over the hexagon part of the camshaft on the 
exhaust side, and turn the camshaft clockwise to apply slack 
to the timing chain between the camshaft sprockets. 

.

<<D>> FRONT CAMSHAFT BEARING CAP 
ASSEMBLY REMOVAL

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.

.

AC705457AC

MB992103

Timing chain

Hexagon 
part of  
exhaust 
camshaft

AC506745

AD

1

2

3

4

Engine front

Front camshaft
bearing cap
assembly

CAMSHAFT

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ENGINE MECHANICAL

11A-33

<<E>> 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.

.

<<F>> CAMSHAFT AND CAMSHAFT SPROCKET 
ASSEMBLY (EXHAUST SIDE) REMOVAL

1. Raise slightly the transaxle side of the camshaft and 

camshaft sprocket assembly (exhaust side) by using the 
slack of the timing chain, and remove from the cam bearing.

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

AC705455AC

Camshaft and camshaft 
sprocket assembly

CAMSHAFT

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ENGINE MECHANICAL

11A-34

2. Remove the timing chain from the camshaft and camshaft 

sprocket assembly (exhaust side) toward the timing chain 
case assembly, and remove the camshaft and camshaft 
sprocket assembly (exhaust side) toward the transaxle.

3. Remove special tool MB992103 inserted into the timing 

chain case assembly.

CAUTION

The timing chain may snag on other parts. After removing 
the camshaft and camshaft sprocket assembly, never 
rotate the crankshaft.
4. After removing the camshaft and camshaft sprocket 

assembly (exhaust side), hang up the timing chain with a 
rope to prevent the timing chain from falling into the timing 
chain case assembly.

.

<<G>> CAMSHAFT SPROCKET/CAMSHAFT 
REMOVAL

Hold the flats of the camshaft with a monkey wrench. Loosen 
the camshaft sprocket mounting bolts and remove the camshaft 
sprocket from the camshaft.

.

AC705458AC

MB992103

Timing chain

Camshaft and
camshaft sprocket
assembly

AC509403

AD

Rope

Timing chain

AC700424AD

Hexagon part 
of camshaft