Mitsubishi Lancer Evolution X. Manual - part 467

THERMOSTAT

TSB Revision

ENGINE COOLING

14-23

THERMOSTAT

REMOVAL AND INSTALLATION

M1141002402772

Pre-removal operation
• Engine Coolant Draining (Refer to 

P.14-17

).

• Engine Upper Cover Removal (Refer to GROUP 16, Igni-

tion System − Ignition Coil 

P.16-40

).

• Air Cleaner Intake Hose Removal (Refer to GROUP 15, 

Air Cleaner 

P.15-11

).

Post-installation operation
• Air Cleaner Intake Hose Installation (Refer to GROUP 15, 

Air Cleaner 

P.15-11

).

• Engine Upper Cover Installation (Refer to GROUP 16, 

Ignition System − Ignition Coil 

P.16-40

).

• Engine Coolant Refilling (Refer to 

P.14-17

).

AC705834

24 ± 3 N·m
18 ± 2 ft-lb

10 ± 2 N·m
89 ± 17 in-lb

1

2

3

4

5

AC

Removal steps 

<<A>>

>>B<<

1.

Radiator lower hose connection

2.

Control wiring harness clamp 
connection

3.

Harness bracket

4.

Cooling water inlet hose fitting

>>A<<

5.

Thermostat

Removal steps (Continued)

THERMOSTAT

TSB Revision

ENGINE COOLING

14-24

REMOVAL SERVICE POINT

.

<<A>> RADIATOR LOWER HOSE DISCONNEC-
TION

Make mating marks on the radiator lower hose and the hose 
clamp as shown to install them in the original position. Then, 
remove them.

INSTALLATION SERVICE POINTS

.

>>A<< THERMOSTAT INSTALLATION

CAUTION

Make absolutely sure that no oil adheres to the rubber ring 
of the thermostat. Also do not fold or scratch the rubber 
ring during installation.
Install the thermostat so that the jiggle valve is facing straight 
up. Be careful not to fold or scratch the rubber ring.

.

>>B<< RADIATOR LOWER HOSE CONNECTION

1. Insert the radiator lower hose as far as the projection of the 

cooling water inlet hose fitting.

2. Align the mating marks on the radiator hose and hose 

clamp, and then connect the radiator hose.

AC606081

Mating marks

AH

AC000279

Jiggle valve

Rubber ring

AD

AC606082

Protrusion

Pipe, fitting, or etc.

BD

Mating marks

THERMOSTAT

TSB Revision

ENGINE COOLING

14-25

INSPECTION

M1141002501055

.

THERMOSTAT CHECK

1. Immerse the thermostat in water, and heat the water while 

stirring. Check the thermostat valve opening temperature.

Standard value: Valve opening temperature: 76.5 ± 

1.5° C (170 ± 3° F)

2. Check that the amount of valve lift is at the standard value 

when the water is at the full-opening temperature.
NOTE: Measure the valve height when the thermostat is 
fully closed, and use this measurement to compare the 
valve height when the thermostat is fully open.

Standard value:

Full-opening temperature:90° C (194° F)

Amount of valve lift: 8.5 mm (0.33 inch) or more

ACX00400

ACX00401AD

Valve lift

WATER PUMP

TSB Revision

ENGINE COOLING

14-26

WATER PUMP

REMOVAL AND INSTALLATION

M1141002701800

Pre-removal operation
• Engine Coolant Draining (Refer to 

P.14-17

).

• Drive Belt Removal (Refer to GROUP 11A, Crankshaft 

Pulley 

P.11A-21

).

• Engine Upper Cover Removal (Refer to GROUP 16, Igni-

tion System − Ignition Coil 

P.16-40

).

• Strut Tower Bar Removal (Refer to GROUP 42A, Strut 

Tower Bar 

P.42A-14

).

Post-installation operation
• Drive Belt Installation (Refer to GROUP 11A, Crankshaft 

Pulley 

P.11A-21

).

• Drive Belt Tension Check (Refer to GROUP 11A, Engine 

Adjustment − Drive Belt Tension Check and Adjustment 

P.11A-7

).

• Strut Tower Bar Installation (Refer to GROUP 42A, Strut 

Tower Bar 

P.42A-14

).

• Engine Upper Cover Installation (Refer to GROUP 16, 

Ignition System − Ignition Coil 

P.16-40

).

• Engine Coolant Refilling (Refer to 

P.14-17

).

AC705835

24 ± 3 N·m
18 ± 2 ft-lb

2

1

6

7

N

N

9.0 ± 1.0 N·m
80 ± 9 in-lb

3

5

4

AC

24 ± 3 N·m
18 ± 2 ft-lb

24 ± 3 N·m
18 ± 2 ft-lb

Removal steps 

1.

Water pump pulley mounting bolts

2.

Water pump inlet pipe mounting 
nuts

3.

Water pump pulley and water 
pump assembly

4.

Water pump pulley

5.

Water pump

6.

Cooling water line gasket

7.

Water pump gasket

Removal steps (Continued)