Nissan Pathfinder (2009 year). Manual — part 143

CO-52

< ON-VEHICLE REPAIR >

[VK56DE]

WATER PUMP

WATER PUMP

Exploded View

INFOID:0000000003939420

Removal and Installation

INFOID:0000000003939421

CAUTION:

• When removing water pump, be careful not to get engine coolant on drive belt.
• Water pump cannot be disassembled and should be replaced as a unit.
• After installing water pump, connect hoses and clamps securely, then check for leaks.

REMOVAL

Remove air dam using power tool.

Remove engine front undercover using power tool.

Remove the air duct and resonator assembly. Refer to

EM-167, "Removal and Installation"

Remove drive belt. Refer to

EM-155, "Removal and Installation"

Drain engine coolant so that no engine coolant comes out from water pump fitting hole. Refer to

CO-41,

"Changing Engine Coolant"

CAUTION:

• Perform when the engine is cold.
• Do not spill engine coolant on drive belt.

Remove reservoir tank hose from radiator shroud (upper).

Remove reservoir tank hose from engine.

Remove radiator hose (upper) from radiator.

CAUTION:

Do not spill engine coolant on drive belt.

Remove the radiator shroud (lower) and position aside.
• Release the tabs, pull radiator shroud (lower) rearwards and

down to remove.

KBIA2543E

Gasket

Water pump

Water pump pulley

WBIA0407E

2009 Pathfinder

WATER PUMP

CO-53

< ON-VEHICLE REPAIR >

[VK56DE]

10. Remove the radiator shroud (upper) bolts and remove the radia-

tor shroud (upper) (A).

11. Remove the engine cooling fan (crankshaft driven type). Refer to

CO-49, "Removal and Installation

(Crankshaft Driven Type)"

12. Remove the water pump pulley.

13. Remove the water pump.

• Engine coolant will leak from the cylinder block, so have a receptacle ready below.

CAUTION:

Handle water pump vane so that it does not contact any other parts.

INSPECTION AFTER REMOVAL

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

pump body and vane.

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

smoothly when rotated by hand.

• Replace the water pump, if necessary.

INSTALLATION

Installation is in the reverse order of removal.
• After installation bleed the air from the cooling system. Refer to

CO-41, "Changing Engine Coolant"

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to

CO-40, "System Inspection"

• Start and warm up engine. Visually check for leaks of engine coolant.

WBIA0695E

KBIA2552E

2009 Pathfinder

CO-54

< ON-VEHICLE REPAIR >

[VK56DE]

THERMOSTAT AND WATER PIPING

THERMOSTAT AND WATER PIPING

Exploded View

INFOID:0000000003939422

Removal and Installation

INFOID:0000000003939423

REMOVAL

Removal of Thermostat

Drain engine coolant from the radiator. Refer to

CO-41, "Changing Engine Coolant"

CAUTION:

Perform when engine is cold.

Remove the air duct and resonator assembly. Refer to

EM-167, "Removal and Installation"

Remove the engine room cover using power tool.

Disconnect the water suction hose from the water inlet.

Remove the water inlet and thermostat.

Removal of Thermostat Housing, Water Outlet and Heater Pipe

Remove the intake manifold. Refer to

EM-168, "Removal and Installation"

Remove the thermostat housing, water outlet and heater pipe.

INSPECTION AFTER REMOVAL

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

KBIA2501E

Heater pipe

Gasket

Water outlet

Gasket

O-ring

Thermostat housing

Rubber ring

Thermostat

10.

Water inlet

11.

Water suction hose

12.

Water suction pipe

13.

Gasket

14.

Heater pipe

2009 Pathfinder

THERMOSTAT AND WATER PIPING

CO-55

< ON-VEHICLE REPAIR >

[VK56DE]

Check valve operation.
• Place a thread so that it is caught in the valve of the thermo-

stat. 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.

• Continue heating. Check the full-open lift amount.
• After checking the full-open lift amount, lower the water tem-

perature and check the valve closing temperature.

• If valve seating at ordinary room temperature, or measured values are out of standard, replace the thermo-

stat.

INSTALLATION

Installation is in the reverse order of removal.

CAUTION:

Do not spill engine coolant in engine room. Use a rag to absorb engine coolant.

Installation of Thermostat

• Install the thermostat with the whole circumference of each flange

part fit securely inside the rubber ring as shown.

• Install the thermostat with the jiggle valve facing upwards.

Installation of Water Outlet Pipe and Heater Pipe

First apply a neutral detergent to the O-rings, then quickly insert the insertion parts of the water outlet pipe and
heater pipe into the installation holes.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to

CO-40, "System Inspection"

• Start and warm up the engine. Visually check for leaks of engine coolant.

SLC252B

Thermostat

Standard

Valve opening temperature

80 - 84

C (176 - 183

Full-open lift amount

More than 10 mm/ 95