Mitsubishi Eclipse. Manual - part 655

THERMOSTAT

TSB Revision

COOLING SYSTEM

14-23

THERMOSTAT

REMOVAL AND INSTALLATION

M1141002400431

REMOVAL SERVICE POINT

.

<<A>> RADIATOR LOWER HOSE DISCONNECTION
Place mating marks on the radiator lower hose and hose clamp 
before disconnection.

INSTALLATION SERVICE POINTS

.

>>A<< THERMOSTAT INSTALLATION

CAUTION

Make absolutely sure that no oil adheres to the rubber ring 
of the thermostat. Also be careful not to 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.

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service − Engine Coolant (Change) 

P.00-58

.]

• Air Cleaner Removal and Installation (Refer to GROUP 15, Air Cleaner 

P.15-6

.)

AC000278

2

3

1

19 ± 1 N·m
13 ± 1 ft-lb

13 ± 2 N·m
109 ± 21 in-lb

1

2

3

AD

<2.4L ENGINE>

<3.0L ENGINE>

REMOVAL STEPS

<<A>> >>B<<

1.

RADIATOR LOWER HOSE 
CONNECTION

2.

WATER INLET FITTING

>>A<<

3.

THERMOSTAT

REMOVAL STEPS (Continued)

AC000279

JIGGLE VALVE

RUBBER RING

AB

THERMOSTAT

TSB Revision

COOLING SYSTEM

14-24

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

clamp, and then connect the radiator hose.

INSPECTION

M1141002500416

Thermostat Check

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

stirring. Check the thermostat valve opening temperature.

Standard value:

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:

ITEM

2.4L 
ENGINE

3.0L ENGINE

VEHICLE 
WITHOUT 
VARIABLE 
INDUCTION 
SYSTEM

VEHICLE 
WITH 
VARIABLE 
INDUCTION 
SYSTEM

Valve 
opening 
temperature 
°C (°F)

88 

± 1.5 (190 

± 3)

88 

± 1.5 

(190 

± 3)

82 

± 1.5 

(180 

± 3)

ITEM

2.4L 
ENGINE

3.0L ENGINE

VEHICLE 
WITHOUT 
VARIABLE 
INDUCTION 
SYSTEM

VEHICLE 
WITH 
VARIABLE 
INDUCTION 
SYSTEM

Full-opening 
temperature 
°C (°F)

100 (212)

100 (212)

95 (203)

Amount of 
valve lift mm 
(in)

8.5 (0.33) or 
more

9.0 (0.35) or 
more

9.0 (0.35) or 
more

ACX00400

ACX00401AB

VALVE LIFT

WATER PUMP

TSB Revision

COOLING SYSTEM

14-25

WATER PUMP

REMOVAL AND INSTALLATION 

M1141002700454

<2.4L ENGINE>

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service - Engine Coolant (Change) 

P.00-58

.]

• Timing Belt Tensioner Pulley Removal and Installation (Refer to GROUP 11A, Timing Belt 

P.11A-38

.)

AC001549

23 ± 2 N·m
16 ± 2 ft-lb

23 ± 3 N·m
17 ± 3 ft-lb 14 ± 1 N·m

117 ± 13 in-lb

1

2

3

4

N

N

AB

REMOVAL STEPS

1.

GENERATOR BRACE

>>B<<

2.

WATER PUMP ASSEMBLY

3.

WATER PUMP GASKET

>>A<<

4.

O-RING

REMOVAL STEPS (Continued)

WATER PUMP

TSB Revision

COOLING SYSTEM

14-26

 <3.0L ENGINE>

INSTALLATION SERVICE POINTS

.

>>A<< O-RING INSTALLATION

CAUTION

• Care must be taken not to permit engine oil or other 

grease to adhere to the O-ring.

• When inserting the pipe, check to be sure that there is 

no sand, dirt, etc. on its inner surface.

Rinse the mounting location of O-ring and water pipe with 
water, and install the O-ring and water pipe.

.

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Supplying [Refer to GROUP 00, Maintenance Service − Engine Coolant (Change) 

P.00-58

.]

• Timing Belt Removal and Installation (Refer to GROUP 11C, Timing Belt 

P.11C-41

.)

AC000280

1

2

3

23 ± 3 N·m
17 ± 3 ft-lb

23 ± 3 N·m
17 ± 3 ft-lb

41 ± 8 N·m
30 ± 6 ft-lb

AB

N

N

4

REMOVAL STEPS

•

THERMOSTAT (REFER TO 

P.14-23

.)

1.

BRACKET

>>B<<

2.

WATER PUMP ASSEMBLY

3.

WATER PUMP GASKET

>>A<<

4.

O-RING

REMOVAL STEPS (Continued)

ACX00402

O-RING

WATER PIPE

AD