Infiniti M35/M45 Y50. Manual - part 353

WATER PUMP

CO-53

[VK45DE]

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WATER PUMP

PFP:21020

Components

NBS004RP

●

Refer to 

GI-11, "Components"

  for symbols in the figure.

Removal and Installation

NBS004RQ

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.

Remove following parts:

●

Front engine undercover (power tool)

●

Engine cover: Refer to 

EM-179, "INTAKE MANIFOLD"

 .

●

Engine room cover (RH and LH): Refer to 

EM-173, "ENGINE ROOM COVER"

 .

●

Air duct (inlet): Refer to 

EM-177, "AIR CLEANER AND AIR DUCT"

 .

●

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

EM-174, "DRIVE BELTS"

 .

2.

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

CO-40, "Chang-

ing Engine Coolant"

 and 

EM-253, "DISASSEMBLY"

 .

CAUTION:

●

Perform this step when engine is cold.

●

Do not spill engine coolant on drive belts.

3.

Remove 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.

1.

Water pump 

2.

Water pump pulley

3.

Gasket

PBIC3396E

CO-54

[VK45DE]

WATER PUMP

INSPECTION AFTER REMOVAL

●

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

Installation is 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-40, "LEAK CHECK"

 .

●

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

PBIC1539E

THERMOSTAT AND WATER CONTROL VALVE

CO-55

[VK45DE]

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THERMOSTAT AND WATER CONTROL VALVE

PFP:21200

Components

NBS004RR

●

Refer to 

GI-11, "Components"

  for symbols in the figure.

Removal and Installation

NBS004RS

REMOVAL

1.

Remove engine room cover (RH and LH). Refer to 

EM-173, "ENGINE ROOM COVER"

 .

2.

Remove engine cover with power tool. Refer to 

EM-179, "INTAKE MANIFOLD"

 .

3.

Remove air duct (inlet). Refer to 

EM-177, "AIR CLEANER AND AIR DUCT"

 .

4.

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

CO-40, "Chang-

ing Engine Coolant"

 and 

EM-253, "DISASSEMBLY"

 .

CAUTION:

●

Perform this step when engine is cold.

●

Do not spill engine coolant on drive belts.

1.

Water connector

2.

O-ring

3.

Rubber ring

4.

Heater hose

5.

Water control valve

6.

Water outlet

7.

Gasket

8.

O-ring

9.

Water outlet pipe

10.

Thermostat housing

11.

Radiator cap

12.

Radiator hose (upper)

13.

Thermostat

14.

Rubber ring

15.

Water inlet

16.

Water suction hose

17.

Water suction pipe

18.

Radiator hose (lower)

19.

Gasket

20.

O-ring

21.

Heater pipe

22.

Heater hose

A.

To radiator

B.

To intake manifold adapter

C.

To cylinder block

D.

To cylinder head (right bank)

E.

To cylinder head (left bank)

F.

To heater core

PBIC3306E

CO-56

[VK45DE]

THERMOSTAT AND WATER CONTROL VALVE

5.

Disconnect water suction hose from water inlet.

6.

Remove water inlet and thermostat.

CAUTION:

Do not disassemble thermostat.

7.

Remove intake manifolds (upper and lower). Refer to 

EM-179, "INTAKE MANIFOLD"

 .

8.

Disconnect radiator hose (upper) from thermostat housing.

9.

Disconnect heater hoses from water outlet and heater pipe.

10. 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 tempar-
ature.

●

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

●

Install thermostat and water control valve with the whole circum-
ference of each flange part fit securely inside rubber ring. (The
example in the figure shows thermostat.) 

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)

PBIC0157E