Nissan Pathfinder (2010 year). Manual - part 128

CO-22

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WATER PUMP

WATER PUMP

Exploded View

INFOID:0000000005260564

Removal and Installation

INFOID:0000000005260565

CAUTION:

• When removing water pump assembly, be careful not to get engine coolant on timing chain and 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

1. Remove engine front under cover. Refer to 

EXT-14, "Removal and Installation"

.

2. Drain engine coolant. Refer to 

CO-11

.

• Remove water drain plug (front).

CAUTION:

• Perform this step when engine is cold.

• Do not spill engine coolant on timing chain and drive belt.

3. Remove the engine room cover. Refer to 

EM-25, "Removal and Installation"

.

4. Remove air duct and resonator assembly. Refer to 

EM-26, "Removal and Installation"

.

5. Remove drive belt. Refer to 

EM-14, "Removal and Installation"

.

6. Remove radiator hose (upper).
7. Remove coolant reservoir hose from the radiator.
8. Remove engine cooling fan (motor driven type). Refer to 

CO-20, "Removal and Installation (Motor driven

type)"

.

9. Remove engine cooling fan (Crankshaft driven type) and fan bracket. Refer to 

CO-19, "Removal and

Installation (Crankshaft driven type)"

.

1.

Water pump

2.

Timing chain tensioner (primary)

3.

Chain tensioner cover

4.

Water drain plug (front)

5.

Water pump cover

6.

O-ring

7.

O-ring

PBIC2833E

2010 Pathfinder

WATER PUMP

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10. Remove chain tensioner cover and water pump cover from front

timing chain case, using Tool.

11. Remove timing chain tensioner (primary) as follows:
a. Loosen clip of timing chain tensioner (primary), and release

plunger stopper (1).

b. Insert plunger into tensioner body by pressing slack guide (2).
c. Keep slack guide pressed and hold plunger in by pushing stop-

per pin through the tensioner body hole and plunger groove (3).

d. Turn crankshaft pulley clockwise so that timing chain on the tim-

ing chain tensioner (primary) side is loose.

e. Remove bolts and remove timing chain tensioner (primary).

CAUTION:

Be careful not to drop bolts inside timing chain case.

12. Remove water pump as follows:

Tool number

: KV10111100 (J-37228)

PBIC2662E

PBIC2835E

PBIC2834E

PBIC2836E

2010 Pathfinder

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WATER PUMP

a. Remove three water pump bolts. Secure a gap between water

pump gear and timing chain, by turning crankshaft pulley coun-

terclockwise until timing chain looseness on water pump

sprocket becomes maximum. 

b. Screw M8 bolts [pitch: 1.25 mm (0.049 in) length: approx. 50

mm (1.97 in)] into water pumps upper and lower bolt holes until

they reach timing chain case. Then, alternately tighten each bolt

for a half turn, and pull out water pump.

CAUTION:

• Pull straight out while preventing vane from contacting

socket in installation area.

• Remove water pump without causing sprocket to contact

timing chain.

• Do not spill engine coolant into timing chain case.

c.

Remove M8 bolts and O-rings from water pump.

CAUTION:

Do not disassemble water pump.

NOTE:

Do not reuse O-rings.

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 water pump, if necessary.

INSTALLATION

1. Install new O-rings to water pump.

NOTE:

• Apply engine oil to O-rings.

• Locate O-ring with white paint mark to engine front side.

PBIC2863E

JLC357B

SLC943A

PBIC2837E

2010 Pathfinder

WATER PUMP

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2.  Install water pump.

CAUTION:

Do not allow timing chain case to pinch O-rings when

installing water pump.

• Make sure that timing chain and water pump sprocket are

engaged.

• Insert water pump by tightening bolts alternately and evenly.

3. Install timing chain tensioner (primary) as follows:
a. Remove dust and foreign material completely from backside of timing chain tensioner (primary) and from

installation area of rear timing chain case.

b. Turn crankshaft pulley clockwise so that timing chain on the timing chain tensioner (primary) side is loose.
c. Install timing chain tensioner (primary) with its stopper pin attached.

CAUTION:

Be careful not to drop bolts inside timing chain case.

d. Remove stopper pin.

e. Make sure again that timing chain and water pump sprocket are engaged.
4. Install chain tensioner cover and water pump cover as follows:
a. Before installing, remove all traces of old liquid gasket from mat-

ing surface of water pump cover and chain tensioner cover

using scraper. Also remove traces of old liquid gasket from the

mating surface of front timing chain case.

b. Apply a continuous bead of liquid gasket, to mating surface of chain tensioner and water pump cover,

using Tool.

Use Genuine RTV Silicone Sealant or equivalent. Refer to

GI-14, "Recommended Chemical Products and Sealants"

.

CAUTION:

Attaching should be done within 5 minutes after coating.

c. Tighten bolts to specified torque. Refer to 

EM-51, "Exploded

View"

.

PBIC1058E

PBIC2838E

SLC446B

Tool number

: WS39930000 ( — )

PBIC2663E

2010 Pathfinder

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WATER PUMP

5. Installation of the remaining components is in the reverse order of removal.

• Refill engine coolant system. Refer to 

CO-12, "Changing Engine Coolant"

.

• Apply liquid gasket to the thread of water drain plug (front).

Use Genuine RTV Silicone Sealant or equivalent. Refer to 

GI-14, "Recommended Chemical Prod-

ucts and Sealants"

.

•

After starting engine, let idle for three minutes, then rev engine up to 3,000 rpm under no load to

purge air from the high-pressure chamber of chain tensioner. Engine may produce a rattling

noise. This indicates that air still remains in the chamber and is not a matter of concern.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to 

CO-11, "System Inspection"

.

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

2010 Pathfinder

WATER INLET AND THERMOSTAT ASSEMBLY

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WATER INLET AND THERMOSTAT ASSEMBLY

Exploded View

INFOID:0000000005260566

Removal and Installation

INFOID:0000000005260567

REMOVAL

1. Remove the engine under cover. Refer to 

EXT-14, "Removal and Installation"

.

2. Drain engine coolant from the radiator. Refer to 

CO-12, "Changing Engine Coolant"

.

CAUTION:

• Perform this step when engine is cold.

• Do not spill engine coolant on drive belts.

3. Remove air duct and resonator assembly and air cleaner case (upper). Refer to 

EM-26, "Removal and

Installation"

.

4. Remove the radiator hose (upper) from the radiator.
5. Remove the coolant reservoir hose from the radiator.
6. Remove the fan shroud (lower) and (upper). Refer to 

CO-16, "Exploded View"

.

7. Disconnect radiator hose (lower) and oil cooler hose from water inlet and thermostat assembly.
8. Remove water inlet and thermostat assembly.

CAUTION:

• Do not disassemble water inlet and thermostat assembly. 

• Replace water inlet and thermostat assembly as a unit, if

necessary.

INSPECTION AFTER REMOVAL

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

1.

Water inlet and thermostat assembly 2.

Gasket

PBIC2839E

SLC962AB

2010 Pathfinder

CO-28

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WATER INLET AND THERMOSTAT ASSEMBLY

2. 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 water inlet

and thermostat assembly.

INSTALLATION

Installation is in the reverse order of removal, paying attention to the following.

•

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

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to 

CO-11, "System Inspection"

.

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

SLC949A

Thermostat

Standard

Valve opening temperature

80.5 - 83.5

°

C (177 - 182

°

F)

Full-open lift amount

8.6 mm / 95

°

C (0.339 in / 203

°

F)

Valve closing temperature

77

°

C (171

°

F)

2010 Pathfinder

WATER OUTLET AND WATER PIPING

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WATER OUTLET AND WATER PIPING

Exploded View

INFOID:0000000005260568

Removal and Installation

INFOID:0000000005260569

REMOVAL

1. Remove the engine under cover. Refer to 

EXT-14, "Removal and Installation"

.

2. Drain engine coolant from radiator. Refer to 

CO-12, "Changing Engine Coolant"

.

CAUTION:

• Perform this step when engine is cold.

• Do not spill engine coolant on drive belts.

3. Remove the intake manifold collector. Refer to 

EM-27, "Removal and Installation"

.

4. Remove engine coolant temperature sensor as necessary.

CAUTION:

Be careful not to damage engine coolant temperature sensor.

5. Remove water outlet, heater pipe, water bypass hoses and water pipe.

INSTALLATION

Installation is in the reverse order of removal, paying attention to the following.

• Securely insert each hose, and install clamp at a position where it does not interfere with the pipe bulge.

• When inserting water pipe into water outlet, apply neutral detergent to O-ring.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant. Refer to 

CO-11, "System Inspection"

.

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

1.

Engine coolant temperature sensor

2.

Washer

3.

Water outlet

4.

Heater hose

5.

O-ring

6.

Water pipe

7.

Water hose

8.

Radiator hose (upper)

9.

Water hose

10. Water hose

11. Gasket

12. Heater pipe

13. Heater hose

14. Gasket

WBIA0615E

2010 Pathfinder