Mitsubishi Lancer Evolution X. Manual - part 67

CRANKSHAFT PULLEY

TSB Revision

ENGINE MECHANICAL

11A-21

CRANKSHAFT PULLEY

REMOVAL AND INSTALLATION

M1112001603226

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 

P.51-15

).

• Radiator Condenser Tank Bracket Removal (Refer to 

GROUP 14, Radiator 

P.14-32

).

Post-installation operation
• Drive Belt Tension Check (Refer to 

P.11A-7

).

• Radiator Condenser Tank Bracket Installation (Refer to 

GROUP 14, Radiator 

P.14-32

).

• 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 

P.51-15

).

AC704354AC

1

2

3

4

to 0 N·m to

250 N·m
184 ft-lb

to +60˚

110 N·m
81 ft-lb

(Engine oil)

Removal steps 

<<

A

>>

>>

B

<<

1.

Drive belt

<<

B

>>

>>

A

<<

2.

Crankshaft pulley center bolt

<<

B

>>

>>

A

<<

3.

Crankshaft pulley washer

•

Engine mounting bracket (Refer 
to GROUP 32, Engine Mounting 

P.32-4

)

>>

A

<<

4.

Crankshaft pulley

Removal steps (Continued)

CRANKSHAFT PULLEY

TSB Revision

ENGINE MECHANICAL

11A-22

Required Special Tools:

• MB992278: Belt Tension Release Wrench
• MB990767: Front Hub and Flange End Yoke 

Holder

• MD998719: Pin

REMOVAL SERVICE POINTS

.

<<A>> DRIVE BELT REMOVAL

To introduce the serpentine drive system with the drive belt 
auto-tensioner, the following operations will be required.

CAUTION

To reuse the drive belt, draw an arrow indicating the rotat-
ing direction on the back of the belt using chalk to install 
the same direction.
1. Rotate the pulley bolt of the auto-tensioner counterclockwise 

with an special tool MB992278 and insert the L-shaped 
hexagon wrench into the auto-tensioner hole to fix the 
auto-tensioner.

2. Remove the drive belt.

.

<<B>> CRANKSHAFT PULLEY CENTER 
BOLT/CRANKSHAFT PULLEY WASHER 
REMOVAL

1. Hold the crankshaft drive sprocket with special tools 

MB990767 and MD998719.

2. Loosen the crankshaft pulley center bolt and remove the 

crankshaft pulley center bolt and crankshaft pulley washer.

AC804028

AF

Auto-tensioner

MB992278

AC511067

AC

Auto-tensioner

Pulley bolt

L-shaped 
hexagon 
wrench

AC506738

AC

MB990767

MD998719

Crankshaft pulley

CRANKSHAFT PULLEY

TSB Revision

ENGINE MECHANICAL

11A-23

INSTALLATION SERVICE POINTS

.

>>A<< CRANKSHAFT PULLEY/CRANKSHAFT 
PULLEY WASHER/CRANKSHAFT PULLEY CEN-
TER BOLT INSTALLATION

1. Wipe off the dirt on the crankshaft and the crankshaft pulley 

as shown in the figure using a rag.

2. Wipe off the dirt on the crankshaft sprocket, the crankshaft 

and the crankshaft pulley as shown in the figure using a rag, 
and then degrease them.
NOTE: Degrease them to prevent drop in the friction coeffi-
cient of the pressed area, which is caused by oil adhesion.

3. Install the crankshaft pulley.
4. Wipe off the dirt on the crankshaft pulley washer and the 

crankshaft pulley center bolt as shown in the figure using a 
rag.

5. Apply an adequate and minimum amount of engine oil to the 

threads of the crankshaft pulley center bolt and the lower 
area of the flange.

6. Hold the crankshaft pulley with special tools MB990767 and 

MD998719 in the same manner as removal.

7. Tighten the crankshaft pulley center bolt according to the 

following procedure.

(1) Tighten the crankshaft pulley center bolt to the specified 

torque 250 N⋅ m (184 ft-lb).

(2) Loosen the crankshaft pulley center bolt fully.
(3) Tighten the crankshaft pulley center bolt to the specified 

torque 110 N⋅ m (81 ft-lb).

(4) As shown in the illustration "A," apply the paint mark to 

the crankshaft pulley on the extended line of the corner 
adjacent to the one of the crankshaft pulley center bolt 
corners.

CAUTION

• When the tightening angle is smaller than the specified 

tightening angle, the appropriate tightening capacity 
cannot be secured.

• When the tightening angle is larger than the specified 

tightening angle, remove the bolt to start from the 
beginning again according to the procedure.

(5) Tighten the crankshaft pulley center bolt by 60 degrees 

angle once more. Make sure the paint mark of crankshaft 
pulley center bolt is aligned with the paint mark of 
crankshaft pulley as shown in the illustration "B."

.

AC705007

AC

: Wipe clean with a rag.
: Wipe clean with a rag and degrease.
: Apply a small amount of engine oil.

Crankshaft
pulley center bolt

Crankshaft
pulley washer

Crankshaft
pulley

Crankshaft

Crankshaft
sprocket

Engine front

AC506738

AC

MB990767

MD998719

Crankshaft pulley

AC710640AB

A

B

60˚

Paint mark

Crankshaft pulley
center bolt

CRANKSHAFT PULLEY

TSB Revision

ENGINE MECHANICAL

11A-24

>>B<< DRIVE BELT INSTALLATION

CAUTION

• To reuse the drive belt, install it by aligning the arrow 

mark on the backside of belt marked at the removal 
with the rotating direction.

• Check that the notches of the notched pulley and the 

notches of the drive belt are fit correctly.

• Check that the drive belt is installed in the center of the 

flat surface of the flat pulley.

1. Install the drive belt to each pulley as shown in the figure.

2. Set an special tool MB992278 to the pulley bolt of the 

auto-tensioner. Then, rotate the auto-tensioner 
counterclockwise and remove the L-shaped hexagon 
wrench fixing the auto-tensioner.

3. Apply tension to the drive belt while slowly turning the 

auto-tensioner clockwise. 

AC704717AG

Drive belt

Notched pulley

Flat pulley

AC706172

AC

Generator

Crankshaft 
pulley

Water pump
pulley

AC804028

AF

Auto-tensioner

MB992278

AC511067

AC

Auto-tensioner

Pulley bolt

L-shaped 
hexagon 
wrench