Infiniti FX35 / FX45. Manual - part 280

CO-50

< SERVICE INFORMATION >

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WATER PUMP

WATER PUMP

Component

INFOID:0000000001325882

Removal and Installation

INFOID:0000000001325883

CAUTION:

• When removing water pump, be careful not to get engine coolant on drive belts.
• Water pump can not be disassembled and should be replaced as a unit.
• After installing water pump, connect hose and clamp securely, then check for leaks using radiator

cap tester (commercial service tool) and radiator cap tester adapter (commercial service tool).

REMOVAL

1.

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

CO-37, "Chang-

ing Engine Coolant"

 and 

EM-242, "Disassembly and Assembly"

.

CAUTION:

• Perform this step when engine is cold.
• Do not spill engine coolant on drive belts.

2.

Remove following parts:
• Engine front undercover
• Air duct (inlet): Refer to 

EM-173, "Component"

.

• Alternator, water pump and A/C compressor belt: Refer to 

EM-170, "Component"

.

3.

Remove fan coupling with cooling fan, and then fan and water pump pulley.

4.

Remove water pump.
• Engine coolant will leak from cylinder block, so have a receptacle ready under vehicle.

CAUTION:

• Handle the water pump vane so that it does not contact any other parts.
• Do not disassemble water pump.

INSPECTION AFTER REMOVAL

1.

Fan and water pump pulley

2.

Water pump

3.

Gasket

PBIC1538E

WATER PUMP

CO-51

< SERVICE INFORMATION >

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• Visually check that there is no significant dirt or rusting on water

pump body and vane.

• Make sure there is no looseness in vane shaft, and that it turns

smoothly when rotated by hand.

• If anything is found, replace water pump.

INSTALLATION

Install in the reverse order of removal.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant using radiator cap tester adapter (commercial service tool) and radiator

cap tester (commercial service tool). Refer to 

CO-37, "Inspection"

.

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

PBIC1539E

CO-52

< SERVICE INFORMATION >

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THERMOSTAT AND WATER CONTROL VALVE

THERMOSTAT AND WATER CONTROL VALVE

Component

INFOID:0000000001325884

1.

O-ring

2.

Water outlet pipe

3.

Thermostat housing

4.

Radiator cap

5.

Radiator hose (upper)

6.

Water hose

7.

Water hose

8.

Water pipe

9.

Water hose

10.

Water hose

11.

Thermostat

12.

Rubber ring

13.

Water inlet

14.

Water suction hose

15.

Water suction pipe

16.

Radiator hose (lower)

17.

Water hose

18.

Water hose

19.

O-ring

20.

Heater pipe

21.

Heater hose

22.

Gasket

23.

Water outlet

24.

Water control valve

25.

Rubber ring

26.

O-ring

27.

Water connector

28.

Heater hose

29.

Gasket

A.

To radiator

B.

To oil cooler

C.

To cylinder block

PBIC4557E

THERMOSTAT AND WATER CONTROL VALVE

CO-53

< SERVICE INFORMATION >

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• Refer to 

GI-8, "Component"

 for symbols in the figure.

Removal and Installation

INFOID:0000000001325885

REMOVAL

1.

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

CO-37, "Chang-

ing Engine Coolant"

 and 

EM-242, "Disassembly and Assembly"

.

CAUTION:

• Perform this step when engine is cold.
• Do not spill engine coolant on drive belts.

2.

Remove engine cover with power tool. Refer to 

EM-169, "Component"

.

3.

Remove air duct (inlet). Refer to 

EM-173, "Component"

.

4.

Disconnect water suction hose from water inlet.

5.

Remove water inlet and thermostat.

CAUTION:

Do not disassemble thermostat.

6.

Remove intake manifolds (upper and lower). Refer to 

EM-175, "Component"

.

7.

Disconnect radiator hose (upper) and water hoses from thermostat housing.

8.

Disconnect heater hoses from water outlet and heater pipe.

9.

Remove thermostat housing, water outlet pipe, water connector, water control valve, water outlet and
heater pipe.

CAUTION:

Do not disassemble water control valve.

INSPECTION AFTER REMOVAL

• Make sure that valves both in thermostat and water control valve are completely closing at normal tempera-

ture.

• Place a thread so that it is caught in the valves of the thermostat

and water control valve. Immerse fully in a container filled with
water. Heat while stirring. (The example in the figure shows ther-
mostat.) 

• The valve opening temperature is the temperature at which the

valve opens and falls from the thread. 

• Continue heating. Check the maximum valve lift.

NOTE:
The maximum valve lift standard temperature for water control
valve is the reference value.

•  After checking the maximum valve lift, lower the water tempera-

ture and check the valve closing temperature.

Standard values:

• If the malfunctioning condition, when closing valve at normal temperature, or measured values are out of the

standard, replace thermostat and/or water control valve.

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 and Water Control Valve

D.

To heater core

E.

To cylinder head (left bank)

F.

To cylinder head (right bank)

G.

To intake manifold adapter

SLC252B

Thermostat

Water control valve

Valve opening temperature

80 - 84

°

C (176 - 183

°

F)

93.5 - 96.5

°

C (200 - 206

°

F)

Maximum valve lift

More than 10 mm/95

°

C

(0.39 in/203

°

F)

More than 8 mm/108

°

C

(0.315 in/226

°

F)

Valve closing temperature

77

°

C (171

°

F)

90

°

C (194

°

F)