Infiniti G37 Coupe. Manual - part 343

CO-22

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WATER INLET AND THERMOSTAT ASSEMBLY

WATER INLET AND THERMOSTAT ASSEMBLY

Exploded View

INFOID:0000000001547674

Removal and Installation

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REMOVAL

1.

Remove engine cover. Refer to 

EM-24, "Exploded View"

.

2.

Remove air duct and air cleaner case assembly (LH). Refer to 

EM-26, "Exploded View"

.

3.

Remove reservoir tank.Refer to 

CO-14, "Exploded View"

.

4.

Remove oil cooler water pipe mounting bolt, and move aside water pipe. Refer to 

LU-10, "Exploded

View"

.

5.

Remove engine undercover with power tool.

6.

Drain engine coolant from radiator drain plug at the bottom of radiator. Refer to 

CO-8, "Draining"

. 

CAUTION:

• Perform this step when the engine is cold.
• Never spill engine coolant on drive belts.

7.

Disconnect radiator hose (lower).

8.

Disconnect intake valve timing control valve harness connector (LH), and remove intake valve timing con-
trol solenoid.

9.

Remove water inlet and thermostat assembly (1).

CAUTION:

Never disassemble water inlet and thermostat assembly.
Replace them as a unit, if necessary.

INSTALLATION

Note the following, and install in the reverse order of removal.
• Be careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.

1.

Gasket

2.

Water inlet and thermostat assembly

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPBIA1201GB

A

: Do not loosen these screw.

JPBIA0261ZZ

WATER INLET AND THERMOSTAT ASSEMBLY

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Inspection

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INSPECTION AFTER REMOVAL

1.

Check valve seating condition at ordinary room temperatures. It should seat tightly.

2.

Check valve operation.

• If the malfunctioning condition, when valve seating at ordinary

room temperature, or measured values are out of the standard,
replace water inlet and thermostat assembly.

INSPECTION AFTER INSTALLATION

• Check that the reservoir tank cap is tightened.
• Check for leaks of engine coolant using the radiator cap tester adapter [SST: EG17650301 (J33984-A)] and

the radiator cap tester (commercial service tool). Refer to 

CO-8, "Inspection"

.

• Start and warm up the engine. Visually check that there is no leaks of engine coolant.

Thermostat (Standard)

: Refer to 

CO-26, "Thermostat"

.

SLC949A

CO-24

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WATER OUTLET AND WATER PIPING

WATER OUTLET AND WATER PIPING

Exploded View

INFOID:0000000001547677

Removal and Installation

INFOID:0000000001547678

REMOVAL

1.

Remove engine cover. Refer to 

EM-24, "Exploded View"

.

2.

Remove reservoir tank. Refer to 

CO-14, "Exploded View"

.

3.

Remove oil level gauge and guide. Refer to 

EM-42, "Exploded View"

.

4.

Remove air duct and air cleaner case assembly (RH and LH). Refer to 

EM-26, "Exploded View"

.

5.

Remove engine undercover with power tool.

6.

Drain engine coolant from radiator drain plug at the bottom of radiator. Refer to 

CO-8, "Draining"

.

1.

Clamp

2.

Water hose

3.

Harness bracket

4.

Water outlet (rear)

5.

Heater hose

6.

Gasket

7.

Washer

8.

Engine coolant temperature sensor

9.

O-ring

10. Water outlet pipe

11.

Water outlet (front)

12.

Clamp

13. Radiator hose (upper)

14.

Gasket

15.

Water pipe

16. Clamp

17.

Water hose

18.

Water hose

19. Gasket

20.

Heater pipe

21.

Clamp

22. Water hose

23.

Clamp

24.

Heater hose

25. Water bypass pipe

26.

O-ring

27.

Heater hose

A.

To EVAP piping

B.

To heater core

C.

To radiator

D.

To oil cooler

E.

To electric throttle control actuator

Refer to 

GI-4, "Components"

 for symbols in the figure.

JPBIA1200GB

WATER OUTLET AND WATER PIPING

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CAUTION:

• Perform this step when the engine is cold.
• Never spill engine coolant on drive belts.

7.

Remove radiator hose (upper) and heater hose.

8.

Separate engine harness removing their bracket from water outlet (rear).

9.

Remove engine coolant temperature sensor as necessary.

CAUTION:

Be careful not to damage engine coolant temperature sensor.

10. Remove heater pipe, water bypass pipe and water outlet pipe.
11. Remove water outlet (rear) as necessary.

NOTE:
Removing engine assembly is required. Refer to 

EM-67, "Exploded View"

.

INSTALLATION

Note the following, and install in the reverse order of removal.
• Securely insert each hose, and install clamp at a position where it does not interfere with the pipe bulge.
• When inserting water outlet pipe and water bypass pipe into water outlet, apply neutral detergent to O-ring.

CAUTION:

Never allow water outlet (rear) to nip O-rings when installing water outlet pipe and water bypass pipe.

Inspection

INFOID:0000000001547679

INSPECTION AFTER INSTALLATION

• Check that the reservoir tank cap is tightened.
• Check for leaks of engine coolant using the radiator cap tester adapter [SST: EG17650301 (J33984-A)] and

the radiator cap tester (commercial service tool). Refer to 

CO-8, "Inspection"

.

• Start and warm up the engine. Visually check that there is no leaks of engine coolant.