Mitsubishi Grandis. Manual - part 812

THERMOSTAT

ENGINE COOLING

14-21

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<< HOSE CLIPS/RADIATOR LOWER 
HOSE CONNECTION

CAUTION

Never reuse the hose clip whose claw is broken 
off to prevent the rusting.
1. Insert a new hose clip into the radiator upper 

hose.

2. Insert the radiator upper hose until the protrusion 

of the water outlet fitting.

3. Remove the hose clip claw and shorten the hose 

clip, then install the radiator upper hose.

INSPECTION

M1141002500502

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: 82 

± 1.5°C

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: 95

°C

Amount of valve lift: 8.5 mm or more

AC000279

Jiggle valve

Rubber ring

AB

ACX00400AB

ACX00401AC

Valve lift

WATER PUMP

ENGINE COOLING

14-22

WATER PUMP

REMOVAL AND INSTALLATION

M1141002700603

INSTALLATION SERVICE POINT
>>A<< O-RING INSTALLATION

Fit the O-ring to the groove in the water inlet pipe. 
Then lubricate the O-ring and the inside of the water 
pump with water, and then insert the pipe to the 
water pump.

Pre-removal Operation
• Engine Coolant Draining (Refer to 

P.14-17

).

• Timing Belt Removal (Refer to GROUP 11A, Timing Belt 

P.11A-33

).

Post-installation Operation
• Timing Belt Installation (Refer to GROUP 11A, Timing Belt 

P.11A-33

).

• Engine Coolant Refilling (Refer to 

P.14-17

).

AC302091

AC302090

AC302105

8 × 55

8 × 22

8 × 14

8 × 55

14 ± 1 N·m

1

2

3

N

N

AC

Bolt specifications

Screw diameter × length mm

Removal steps

1.

Water pump

2.

Water pump gasket

>>A<<

3.

O-ring

AC103005

Water pump

O-ring

Water inlet pipe

AD

WATER HOSE AND WATER PIPE

ENGINE COOLING

14-23

WATER HOSE AND WATER PIPE

REMOVAL AND INSTALLATION

M1141003300642

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

P.14-17

).

• Engine Cover Removal and Installation (Refer to GROUP 

11A, Camshaft and Valve Stem Seal 

P.11A-16

).

• Air Cleaner Assembly Removal and Installation (Refer to 

GROUP 15, Air Cleaner 

P.15-3

).

• Thermostat Removal and Installation (Refer to 

P.14-20

).

AC302094

AC310936

AC302095

13 ± 2 N·m

11 ± 1 N·m

11 ± 1 N·m

24 ± 4 N·m

13 ± 2 N·m

1

2

3

4

6

7

8

9

10

11

12

13

14

15

15

N

N

7

10

Ø3 mm

AB

5

N

N

24 ± 4 N·m

Sealant: Mitsubishi Genuine Part No. MD970389 
or equivalent

(Transmission fluid)

Removal steps

<<A>>

>>C<<

1.

Radiator upper hose connection

<<A>>

>>C<<

2.

Hose clips

3.

Radiator hose clamp

4.

A/T oil level gauge guide <A/T>

5.

O-ring <A/T>

6.

A/T oil level gauge guide bracket 
<A/T>

>>B<<

7.

Water outlet fitting

8.

Heater hose connection

9.

Throttle body water return hose

>>B<<

10. Thermostat case
11. Heater hose connection
12. Battery harness clamp
13. Throttle body water feed hose

Removal steps (Continued)

WATER HOSE AND WATER PIPE

ENGINE COOLING

14-24

REMOVAL SERVICE POINT
<<A>> RADIATOR HOSE/HOSE CLIPS 
DISCONNECTION

Break off the tip of hose clip claw and spread out the 
hose clip, then disconnect the radiator hose.
NOTE: If there is a hose clip claw, the hose clip 
cannot spread to capacity because the claw contacts 
the hose clip.

INSTALLATION SERVICE POINTS
>>A<< O-RING INSTALLATION

CAUTION

Do not allow engine oil or other grease to adhere 
to the cooling water line O-ring
Insert the cooling water line O-ring to the water pump 
water inlet pipe, and coat the outer portion of the 
cooling water line O-ring with water or engine 
coolant.

>>B<< THERMOSTAT CASE 
ASSEMBLY/WATER OUTLET HOSE 
FITTING INSTALLATION

1. Use a gasket scraper or wire brush to completely 

eliminate all gasket material on the gasket 
mounting surface.

2. Apply a bead of the specified sealant.

Specified Sealant: MITSUBISHI GENUINE 
PART No.MD970389 or equivalent

3. Apply sealant to the thread of the thermostat case 

assembly bolts as shown.

Specified adhesive: 3M Stud Locking 4170 or 
equivalent

4. With the sealant still wet (within 15 minutes after 

the sealant is applied), install the thermostat case. 
Do not apply the sealant in an area more than the 
required.

>>C<< HOSE CLIPS/RADIATOR HOSE 
CONNECTION

CAUTION

Never reuse the hose clip whose claw is broken 
off to prevent the rusting.
1. Insert a new hose clip into the radiator upper 

hose.

2. Insert the radiator upper hose until the protrusion 

of the water outlet fitting.

3. Remove the hose clip claw and shorten the hose 

clip, then install the radiator upper hose.

INSPECTION

M1141003400371

WATER PIPE AND HOSE CHECK

Check the water pipe and hose for cracks, damage 
and clogs. Replace them if necessary.

14. Water inlet pipe

>>A<<

15. O-ring

Removal steps (Continued)

AC302615

Hose clip

Claw (Tip)

AE

AC200644 AC

O-ring

Water inlet pipe

Water pump or thermostat case

AC303724AE

Thermostat case assembly