Nissan Pathfinder (2012 year). Manual - part 128

ENGINE COOLING FAN

CO-21

< REMOVAL AND INSTALLATION >

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• Check that the fan bracket shaft turns smoothly by hand and is not

excessively loose.

• If there are concerns, replace the fan bracket assembly.

INSTALLATION

Installation is in the reverse order of removal.

• Install cooling fan with its front mark “F” facing front of engine. Refer to 

CO-20, "Removal and Installation

(Crankshaft driven type)"

.

INSPECTION AFTER INSTALLATION

• Check for leaks of the engine coolant. Refer to 

CO-11, "System Inspection"

.

• Start and warm up the engine. Visually check for coolant leaks and repair if necessary.

Removal and Installation (Motor driven type)

INFOID:0000000007357914

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

1. Remove the engine under cover. Refer to 

EXT-15, "Removal and Installation"

.

2. Partially 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. Release the lower radiator shroud (2) from the upper radiator

shroud (1) and position aside. 

• Release the tabs, pull lower radiator shroud (2) rearward and

down.

4. Remove engine room cover (if equipped). Refer to 

EM-25, "Removal and Installation"

.

5. Remove air duct and resonator assembly. Refer to 

EM-26, "Removal and Installation"

.

6. Remove upper radiator hose from radiator.
7. Remove reservoir tank hose from radiator shroud (upper) and radiator.
8. Remove the radiator shroud (upper) bolts and remove the radiator shroud (upper). Refer to 

CO-17,

"Exploded View"

.

LBIA0422E

ALBIA0470ZZ

August 2012

2012 Pathfinder

CO-22

< REMOVAL AND INSTALLATION >

[VQ40DE]

ENGINE COOLING FAN

9. Disconnect harness connector from fan motor.
10. Remove the bolt and remove the fan grille and motor assembly. 

INSTALLATION

Installation is in the reverse order of removal.

• Cooling fan is controlled by ECM. For details, refer to 

EC-321, "Diagnosis Procedure"

.

AWBIA0148ZZ

August 2012

2012 Pathfinder

WATER PUMP

CO-23

< REMOVAL AND INSTALLATION >

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WATER PUMP

Exploded View

INFOID:0000000007357915

Removal and Installation

INFOID:0000000007357916

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter

of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

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.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

1. Remove engine under cover. Refer to 

EXT-15, "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 timing chain and drive belt.

3. Remove air duct and resonator assembly. Refer to 

EM-26, "Removal and Installation"

.

4. Remove drive belt. Refer to 

EM-14, "Removal and Installation"

.

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

CO-21, "Removal and Installation (Motor driven

type)"

.

8. Set No. 1 cylinder at TDC.

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

August 2012

2012 Pathfinder

CO-24

< REMOVAL AND INSTALLATION >

[VQ40DE]

WATER PUMP

• Rotate crankshaft pulley clockwise to align timing mark (A)

(grooved line without color) with timing indicator (B).

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

CO-20, "Removal and Installation (Crank-

shaft driven type)"

.

10. Remove water drain plug (front) (1) on the water pump side of

the cylinder block.

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

timing chain case, using Tool.

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

plunger stopper (1).

b. Depress plunger into tensioner body by pressing slack guide (2).
c.

Keep slack guide pressed and insert stopper pin through the

tensioner body hole and plunger groove (3) to hold plunger in.

AWBIA0719ZZ

ALBIA0679ZZ

Tool number

: KV10111100 (J-37228)

PBIC2662E

PBIC2835E

August 2012

2012 Pathfinder

WATER PUMP

CO-25

< REMOVAL AND INSTALLATION >

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d. Remove timing chain tensioner bolts and remove timing chain

tensioner (primary).

CAUTION:

Be careful not to drop timing chain tensioner bolts inside

timing chain case.

13. Remove water pump as follows:
a. Make a gap between water pump sprocket and timing chain, by

carefully turning crankshaft pulley counterclockwise until timing

chain loosens on water pump sprocket. Remove three water

pump bolts. 

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

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

they reach timing chain case. Remove water pump.

CAUTION:

• Place a suitable shop cloth below the water pump hous-

ing to prevent any engine coolant from dripping into the

timing chain case.

• Pull water pump straight out while preventing vane from

contacting socket in installation area.

• Remove water pump without causing sprocket to contact

timing chain.

c. Remove M8 bolts and O-rings from water pump.

CAUTION:

• Do not disassemble water pump.

• Do not reuse O-rings.

INSPECTION AFTER REMOVAL

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

water pump body and vane.

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

smoothly when rotated by hand. 

• If the water pump does not perform properly, replace the water

pump assembly.

INSTALLATION

1. Install new O-rings to water pump.

CAUTION:

Do not reuse O-rings.

NOTE:

PBIC2836E

PBIC2863E

JLC357B

SLC943A

August 2012

2012 Pathfinder

CO-26

< REMOVAL AND INSTALLATION >

[VQ40DE]

WATER PUMP

• Apply engine oil to O-rings.

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

2. Hold timing chain to the side (

) and install water pump (

).

CAUTION:

• Do not reuse O-rings.

• 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.

• Tighten water pump bolts alternately and evenly.

3. Remove dust and foreign material completely from installation area of timing chain tensioner (primary)

and rear timing chain case.

4. Turn crankshaft pulley approximately 20

°

 clockwise so that tim-

ing chain on the timing chain tensioner (primary) side is loose.

5. Install timing chain tensioner (primary) with its stopper pin inserted.

CAUTION:

Be careful not to drop bolts inside timing chain case.

6. Remove stopper pin.

• Make sure again that timing chain and water pump sprocket

are engaged.

7. Install chain tensioner cover and water pump cover.

PBIC2837E

PBIC1058E

PBIC0848E

PBIC2838E

August 2012

2012 Pathfinder

WATER PUMP

CO-27

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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:

• Installation should be done within 5 minutes after apply-

ing liquid gasket.

• Do not fill the engine with oil for at least 30 minutes after

the components are installed to allow the sealant to cure.

c. Tighten bolts to specified torque. Refer to 

EM-53, "Exploded View"

.

8. Install water drain plug (front) (1) on water pump side of cylinder

block.

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

Use Genuine RTV Silicone Sealant or equivalent. Refer to

GI-14, "Recommended Chemical Products and Sealants"

.

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

• After installation refill engine coolant and check for leaks. Refer to 

CO-12, "Changing Engine Coolant"

and 

CO-11, "System Inspection"

.

CAUTION:

Do not spill coolant in the engine compartment. Use a shop cloth to absorb coolant.

• 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 the chain tensioner. The 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 coolant leaks. Refer to 

CO-11, "System Inspection"

.

• Start and warm up engine. Visually check for coolant leaks. Repair as necessary.

SLC446B

Tool number

: WS39930000 ( — )

PBIC2663E

Water drain plug (front)

: 9.8 N·m (1.0 kg-m, 87 in-lb)

ALBIA0679ZZ

August 2012

2012 Pathfinder

CO-28

< REMOVAL AND INSTALLATION >

[VQ40DE]

WATER INLET AND THERMOSTAT ASSEMBLY

WATER INLET AND THERMOSTAT ASSEMBLY

Exploded View

INFOID:0000000007357917

Removal and Installation

INFOID:0000000007357918

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure

engine coolant escaping from the radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter

of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

1. Remove the engine under cover. Refer to 

EXT-15, "Removal and Installation"

.

2. Partially 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 shroud and radiator.
6. Remove the fan shroud (lower) and (upper). Refer to 

CO-17, "Exploded View"

.

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

1.

Water inlet and thermostat assembly 2.

Gasket

PBIC2839E

August 2012

2012 Pathfinder