Nissan Pathfinder (2008 year). Manual - part 129

ENGINE COOLING FAN

CO-21

< ON-VEHICLE REPAIR >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

8.

Disconnect harness connector from fan motor.

9.

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-45, "Description"

.

AWBIA0148ZZ

CO-22

< ON-VEHICLE REPAIR >

[VQ40DE]

WATER PUMP

WATER PUMP

Removal and Installation

INFOID:0000000001282196

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 hose and clamp securely, then check for leaks using tool.

REMOVAL

1.

Remove air dam using power tool.

2.

Remove engine undercover using power tool.

3.

Remove air duct and resonator. Refer to 

EM-25, "Removal and Installation"

.

4.

Remove drive belt. Refer to 

EM-13, "Removal and Installation"

.

5.

Drain engine coolant. Refer to 

CO-11

.

CAUTION:

• Perform this step when engine is cold.
• Do not spill engine coolant on timing chain and drive belt.

6.

Remove radiator hose (upper) and cooling fan assembly. Refer to 

CO-19, "Removal and Installation

(Crankshaft driven type)"

.

7.

Remove chain tensioner cover and water pump cover from front
timing chain case, using Tool.

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

Tool number

: KV10111100 (J-37228)

PBIC2662E

WATER PUMP

CO-23

< ON-VEHICLE REPAIR >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

8.

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.

9.

Remove water pump as follows:

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. 

PBIC2835E

PBIC2834E

PBIC2836E

PBIC2863E

CO-24

< ON-VEHICLE REPAIR >

[VQ40DE]

WATER PUMP

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

• Check for badly rusted or corroded water pump body assembly.
• Check for rough operation due to excessive end play.
• 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.

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.

JLC357B

SLC943A

PBIC2837E

PBIC1058E

WATER PUMP

CO-25

< ON-VEHICLE REPAIR >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

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-26, "Recommended Chemical Products and Sealants"

.

CAUTION:

Attaching should be done within 5 minutes after coating.

c.

Tighten bolts to specified torque. Refer to 

EM-184, "Compo-

nents"

.

5.

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-26, "Recommended Chemical Prod-

ucts and Sealants"

.

6.

Installation of the remaining components is in the reverse order of removal after this step.
• 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 using tool. Refer to 

CO-11, "System Inspection"

.

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

PBIC2838E

SLC446B

Tool number

: WS39930000 (

—

)

PBIC2663E

CO-26

< ON-VEHICLE REPAIR >

[VQ40DE]

WATER INLET AND THERMOSTAT ASSEMBLY

WATER INLET AND THERMOSTAT ASSEMBLY

Removal and Installation

INFOID:0000000001282197

REMOVAL

1.

Completely drain engine coolant. Refer to 

CO-12, "Changing Engine Coolant"

.

CAUTION:

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

2.

Remove air duct and air cleaner case. Refer to 

EM-25, "Removal and Installation"

.

3.

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

4.

Remove water inlet and thermostat assembly.

CAUTION:

Do not disassemble water inlet and thermostat assembly.
Replace them as a unit, if necessary.

INSPECTION AFTER REMOVAL

1.

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

2.

Check valve operation.

• If the malfunctioning condition, when valve seating at ordinary

room temperature, or measured values are out of the standard,
replace water inlet and thermostat assembly.

1.

Water inlet and thermostat assembly 2.

Gasket

PBIC2839E

SLC962AB

Thermostat

Standard

Valve opening temperature

80.5 - 83.5

°

C (177 - 182

°

F)

Maximum valve lift

8.6 mm / 95

°

C (0.339 in / 203

°

F)

Valve closing temperature

77

°

C (171

°

F)

SLC949A

WATER INLET AND THERMOSTAT ASSEMBLY

CO-27

< ON-VEHICLE REPAIR >

[VQ40DE]

C

D

E

F

G

H

I

J

K

L

M

A

CO

N

P

O

INSTALLATION

Installation is in the reverse order of removal, paying attention to the following.
• Be careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.

INSPECTION AFTER INSTALLATION

• Check for leaks of engine coolant using tool. Refer to 

CO-11, "System Inspection"

.

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

CO-28

< ON-VEHICLE REPAIR >

[VQ40DE]

WATER OUTLET AND WATER PIPING

WATER OUTLET AND WATER PIPING

Removal and Installation

INFOID:0000000001282198

REMOVAL

1.

Completely drain engine coolant. Refer to 

CO-12, "Changing Engine Coolant"

.

CAUTION:

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

2.

Remove A/T fluid charging pipe Refer to 

TM-224, "2WD : Exploded View"

 or 

TM-228, "4WD : Exploded

View"

.

3.

Remove the rocker cover (right bank). Refer to 

EM-42, "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 using tool. Refer to 

CO-11, "System Inspection"

.

• Start and warm up engine. Visually check there are no 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