Mitsubishi Galant 9G. Manual - part 342

THERMOSTAT

TSB Revision

ENGINE COOLING

14-16

<3.8L ENGINE>

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Refilling (Refer to 

P.14-7

).

• Engine Cover Removal and Installation (Refer to GROUP 

11C, Engine Assembly 

P.11C-16

).

• Powertrain Control Module (PCM) Removal and Installa-

tion (Refer to GROUP 13B, Powertrain Control Module 

(PCM) 

P.13B-1192

).

• Air Cleaner Removal and Installation (Refer to GROUP 

15, Air Cleaner 

P.15-4

).

• Strut Tower Bar Removal and Installation (Refer to 

GROUP 42, Strut Tower Bar 

P.42-12

).

• Battery and Battery Tray Removal and Installation

AC306935

5.0 ± 1.0 N·m
44 ± 9 in-lb

8

7

3

4

9

13

14

20

16

12

6

5

19

18

17

2

1

9.0 ± 2.0 N·m
80 ± 17 in-lb

15

5.0 ± 1.0 N·m
44 ± 9 in-lb

22 ± 4 N·m
16 ± 3 ft-lb

13

10

11

AB

REMOVAL STEPS

1.

LEFT BANK HEATED  OXYGEN 
SENSOR (REAR) CONNECTOR

2.

LEFT BANK HEATED  OXYGEN 
SENSOR (FRONT) CONNECTOR

3.

RIGHT BANK HEATED OXYGEN 
SENSOR (REAR) CONNECTOR

4.

RIGHT BANK HEATED OXYGEN 
SENSOR (FRONT) CONNECTOR

5.

THROTTLE BODY ASSEMBLY 
CONNECTOR

6.

EVAPORATIVE EMISSION 
PURGE SOLENOID CONNECTOR

7.

MANIFOLD ABSOLUTE 
PRESSURE SENSOR 
CONNECTOR

8.

POWER STEERING PRESSURE 
SWITCH CONNECTOR

9.

CONTROL WIRING HARNESS 
AND WIRING HARNESS 
COMBINATION CONNECTOR

10. KNOCK SENSOR CONNECTOR
11. CRANKSHAFT POSITION 

SENSOR CONNECTOR

12. EXHAUST GAS RECIRCULATION 

VALVE CONNECTOR

13. INJECTOR CONNECTOR
14. ENGINE COOLANT 

TEMPERATURE SENSOR 
CONNECTOR

15. CAPACITOR CONNECTOR

REMOVAL STEPS (Continued)

THERMOSTAT

TSB Revision

ENGINE COOLING

14-17

REMOVAL SERVICE POINT

.

<<A>> RADIATOR LOWER HOSE DISCONNEC-
TION

Make mating marks on the radiator hose and the hose clamp. 
Disconnect the radiator hose.

16. CAMSHAFT POSITION SENSOR 

CONNECTOR

17. INHIBITOR SWITCH SENSOR 

CONNECTOR

18. A/T CONTROL  SOLENOID VALVE 

ASSEMBLY CONNECTOR

19. OUTPUT SHAFT SPEED 

SENSOR CONNECTOR

20. INPUT SHAFT SPEED SENSOR 

CONNECTOR

REMOVAL STEPS (Continued)

AC306959AB

19 ± 1 N·m
14 ± 1 ft-lb

21

22

23

REMOVAL STEPS

<<A>> >>B<<

21. RADIATOR LOWER HOSE 

CONNECTION

22. WATER INLET FITTING

>>A<<

23. THERMOSTAT

REMOVAL STEPS (Continued)

AC200641AB

MATING MARKS

THERMOSTAT

TSB Revision

ENGINE COOLING

14-18

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 each hose as far as the projection of the water inlet 

fitting.

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

clamp, and then connect the radiator hose.

INSPECTION

M1141002500450

.

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:

<2.4L Engine> 82 

± 1.5°C (180 ± 3°F)

<3.8L Engine> 88 

± 1.5°C (190 ± 3°F)

AC000279

JIGGLE VALVE

RUBBER RING

AB

AC200642

MATING
MARKS

PROJECTION

WATER INLET 
FITTING 

AE

ACX00400

WATER PUMP

TSB Revision

ENGINE COOLING

14-19

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:

<2.4L Engine> 95

°C (203°F)

<3.8L Engine> 100

°C (212°F)

Amount of valve lift:

<2.4L Engine> 8.5 mm (0.33 inch) or more
<3.8L Engine> 9.0 mm (0.35 inch) or more

WATER PUMP

REMOVAL AND INSTALLATION <2.4L ENGINE>

M1141002700487

ACX00401AB

VALVE LIFT

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Refilling (Refer to 

P.14-7

).

• Timing Belt Removal and Installation (Refer to GROUP 

11A, Timing Belt 

P.11A-51

).

AC306675AB

1

2

3

N

N

14 ± 1 N·m
120 ± 13 in-lb

14 ± 1 N·m
120 ± 13 in-lb

BOLT SPECIFICATIONS

THREAD DIAMETER × LENGTH mm(in)

8 × 55
(0.3 × 2.2)

8 × 55
(0.3 × 2.2)

8 × 22
(0.3 × 0.9)

8 × 22
(0.3 × 0.9)

8 × 14
(0.3 × 0.6)

REMOVAL STEPS 

1.

WATER PUMP

2.

WATER PUMP GASKET

>>A<<

3.

O-RING

REMOVAL STEPS  (Continued)