Infiniti QX56 (Z62). Manual - part 240

CO-20

< REMOVAL AND INSTALLATION >

WATER INLET AND THERMOSTAT ASSEMBLY

WATER INLET AND THERMOSTAT ASSEMBLY

Exploded View

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Removal and Installation

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REMOVAL

1.

Remove engine cover. Refer to 

EM-25, "Exploded View"

.

1.

Water inlet

2.

Clamp

3.

Water suction hose

4.

Water suction pipe

5.

Hose connector

6.

Clamp

7.

Water hose

8.

Gasket

9.

Water pipe

10. Heater pipe

11.

O-ring

12.

Water connector

13. Pakkin

14. O-ring

15.

Thermostat housing

16. Clamp

17. Water hose

18.

Pakkin

19. Clamp

20. Water hose

21.

Thermostat

22. Water hose

23. Pakkin

24.

Clamp

A.

To electric throttle control actuator

B.

To oil cooler

C.

To electric throttle control actuator

D.

To radiator

E.

To reservoir tank

F.

To radiator

G

To heater

H.

To heater

Refer to 

GI-4, "Components"

 for symbols in the figure.

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WATER INLET AND THERMOSTAT ASSEMBLY

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< REMOVAL AND INSTALLATION >

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2.

Remove front under cover with power tool. Refer to 

EXT-25, "Exploded View"

.

3.

Drain engine coolant from drain plugs on radiator and cylinder block. Refer to 

CO-8, "Draining"

 and 

EM-

103, "Setting"

.

CAUTION:

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

4.

Disconnect radiator hose (upper and lower). Refer to 

CO-13, "Exploded View"

.

5.

Remove intake manifold. Refer to 

EM-30, "Exploded View"

.

6.

Remove fuel feed tube. Refer to 

EM-43, "Exploded View"

.

7.

Remove water hose, water connector, heater pipes and heater hoses.

8.

Remove thermostat housing.

9.

Remove water inlet and thermostat.

INSTALLATION

Note the following, and install in the reverse order of removal.

CAUTION:

Be careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.

Thermostat

• Install thermostat with the whole circumference of each flange part

(A) fit securely inside rubber ring (1).

• Install thermostat with jiggle valve (A) facing upwards. The position

deviation may be within the range of 20 degrees (b).

Water Connector and Heater Pipe 

• First apply a neutral detergent to O-rings, then quickly insert the insertion parts of the water connector and

heater pipe into the installation holes.

Inspection

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INSPECTION AFTER REMOVAL

• Check that valve in thermostat is completely closing at normal temperature.

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WATER INLET AND THERMOSTAT ASSEMBLY

• Place a thread (A) so that it is caught in the valve of the thermostat.

Immerse fully in a container filled with water. Heat while stirring.

• The valve opening temperature is the temperature at which the

valve opens and falls from the thread.

• After checking the maximum valve lift, lower the water temperature

and check the valve closing temperature.

• If the malfunctioning condition, when valve seating at ordinary

room temperature, or measured values are out of the standard,
replace thermostat.

INSPECTION AFTER INSTALLATION

• Check that the reservoir tank cap is tightened.
• Check for leakage of engine coolant using the radiator cap tester adapter (commercial service tool) 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 leakage of engine coolant.

Thermostat (Standard)

: Refer to 

CO-23, "Thermostat"

.

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SERVICE DATA AND SPECIFICATIONS (SDS)

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SERVICE DATA AND SPECIFICATIONS (SDS)

SERVICE DATA AND SPECIFICATIONS (SDS)

Periodical Maintenance Specification

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ENGINE COOLANT CAPACITY (APPROXIMATELY)

Unit: 

 (US qt, Imp qt)

Radiator

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Unit: kPa (kg/cm

2

, psi)

Thermostat

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Engine coolant capacity [With reservoir tank (“MAX” level)]

14.9 (15-6/8, 13-1/8)

Reservoir tank engine coolant capacity (At “MAX” level)

1.0 (1, 7/8)

Reservoir tank cap relief pressure

Standard

108.2 - 127.8 ( 1.1 - 1.3, 15.7 - 18.5)

Limit

98 (1.0, 14)

Leakage testing pressure

186 (1.9, 27)

Thermostat

Standard 

Valve opening temperature

82

°

C (180

°

F)

Maximum valve lift

10.0 mm/95

°

C (0.394 in/203

°

F)

Valve closing temperature

77

°

C (171

°

F)