Nissan Pathfinder. Manual - part 293

WATER PUMP

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< REMOVAL AND INSTALLATION >

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WATER PUMP

Exploded View

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Removal and Installation

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WARNING:

Do not 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

turn to allow built-up pressure to escape. Carefully remove the cap by turning it all the way.    

CAUTION:

• When removing water pump assembly, be careful not to get engine coolant on drive belt.

• Water pump cannot be disassembled and must be replaced as a unit.

• After installing the water pump, connect hose and clamp securely, then check for leaks. Repair as

necessary. 

NOTE:

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

ing.

REMOVAL

1. Disconnect the negative battery terminal. Refer to 

PG-90, "Removal and Installation"

.

2. Remove the engine room cover. Refer to 

EM-23, "Removal and Installation"

.

3. Remove front air duct. Refer to 

EM-24, "Removal and Installation"

.

4. Remove front under cover. Refer to 

EXT-16, "Exploded View"

.

5. Drain engine coolant from the radiator. Refer to 

CO-11, "Changing Engine Coolant"

.

CAUTION:

Perform when the engine is cold.

6. Drain the power steering fluid reservoir. Refer to 

ST-42, "Draining and Refilling"

.

7. Remove the front road wheel and tire (RH) using suitable tool. Refer to 

WT-58, "Adjustment"

.

8. Remove the fender protector (RH). Refer to 

EXT-28, "FENDER PROTECTOR : Removal and Installation"

.

9. Disconnect engine coolant reservoir hose and remove engine coolant reservoir tank. 
10. Set No. 1 cylinder at TDC on its compression stroke.

• Align pointer with TDC mark on crankshaft pulley.

1.

Timing chain tensioner (primary)

2.

Valve timing control cover gasket 
(bank 1)

3.

Valve timing control cover (bank 1)

4.

Water pump cover

5.

O-ring

6.

O-ring

7.

Water pump

A. Apply engine oil

B. Identify with white mark

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WATER PUMP

11. Remove drive belt. Refer to 

EM-12, "Removal and Installation"

.

12. Remove the drive belt auto-tensioner assembly. Refer to 

EM-14, "Removal and Installation of Drive Belt

Auto-tensioner"

.

13. Remove cylinder block water drain plug (A) and copper sealing

washer (B) to drain engine coolant from engine.

CAUTION:

Do not reuse copper sealing washers.

14. Remove the E-PSF cover, bracket and motor. Refer to 

ST-52, "Removal and Installation"

.

15. Support engine and remove the RH engine insulator and bracket. Refer to 

EM-106, "4WD : Exploded

View"

.

16. Disconnect the A/C lines at the junction. Refer to 

HA-35, "HIGH-PRESSURE PIPE : Removal and Instal-

lation"

.

17. Disconnect (RH) valve timing control harness connectors and remove valve timing control cover (bank 1).

Refer to 

EM-54, "Exploded View"

.

18. Remove water pump cover. Refer to 

EM-54, "Exploded View"

.

19. Remove the timing chain tensioner (primary) as follows:
a. Pull the lever (C) down to release the plunger stopper tab (B).
b. Insert the stopper pin A into the tensioner body hole to hold the

lever (C) and keep the plunger stopper tab (B) released.

NOTE:

An allen wrench [(1.2 mm (0.047 in)] is used for a stopper pin A

as an example.

c.

Compress the plunger (D) into the tensioner body (1) by press-

ing the slack guide (2).

d. Keep the slack guide (2) pressed and lock the plunger (D) in by

pushing the stopper pin A through the lever (C) and into the

chain tensioner body hole.

e. Remove timing chain tensioner bolts and then remove the timing chain tensioner.

CAUTION:

Be careful not to drop timing chain tensioner bolts inside timing chain case.

20. Remove the three water pump bolts (A). Make a gap between

water pump sprocket (1) and timing chain, by carefully turning

crankshaft pulley (2) counterclockwise until timing chain loosens

on water pump sprocket (1).

: Front

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WATER PUMP

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21. Remove water pump.
a. Screw M8 bolts approximately 50 mm (1.97 in) into water pump

upper and lower bolt holes until they reach the timing chain case

[M8 bolt pitch 1.25 mm (0.49 in) length].

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.

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

CAUTION:

Do not reuse O-rings.

INSPECTION AFTER REMOVAL

• Visually check for significant dirt or rust on the water pump body

and vane.

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

excessively loose.

• Replace the water pump assembly if the water pump does not per-

form properly.

INSTALLATION

1. Install new O-rings on water pump.

CAUTION:

Do not reuse O-rings.

a. Apply engine oil and engine coolant to the O-rings as shown.
b. Locate the O-ring with white paint mark to engine front side.

2. Hold timing chain to the side (

) and install the water pump

(

).

CAUTION:

Do not allow the O-rings to be damaged by the cylinder

block when installing the water pump.

• Check that timing chain and water pump sprocket are

engaged.

• Tighten water pump bolts alternately and evenly to specifica-

tion.

3. Remove dust and foreign material completely from installation area of timing chain tensioner and rear tim-

ing chain case.

JLC357B

SLC943A

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WATER PUMP

4. Turn the crankshaft pulley approximately 20

° clockwise so that

the timing chain on the timing chain tensioner side is loose.

5. Apply engine oil to the engine oil feed hole and timing chain tensioner and install the timing chain ten-

sioner.

6. Remove the stopper pin (A).

7. Install valve timing control cover (bank 1) and water pump cover.
a. Before installing, remove all traces of liquid gasket from mating surface of water pump cover and IVT

cover using a scraper.

Also remove traces of liquid gasket from the mating surface of the front cover.

b. Apply a continuous bead of liquid gasket to mating surface of IVT cover and water pump cover. Use Gen-

uine RTV Silicone Sealant or equivalent. Refer to 

GI-22, "Recommended Chemical Products and

Sealants"

.

CAUTION:

• Installation should be done within 5 minutes after applying liquid gasket.

• Do not fill the engine with engine oil for at least 30 minutes after the components are installed to

allow the sealant to cure.

8. Install cylinder block water drain plug (A) and copper sealing

washer (B).

CAUTION:

Do not reuse copper sealing washers.

• Apply liquid gasket to the threads of cylinder block front drain

plug. 

Use Genuine RTV Silicone Sealant or equivalent. Refer to

GI-22, "Recommended Chemical Products and Sealants"

.

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

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

CO-11, "Changing Engine Coolant"

and 

CO-10, "System Inspection"

.

CAUTION:

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

PBIC0848E

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: Front

Cylinder block front 
drain plug 

: Refer to 

EM-112, "Disas-

sembly and Assembly"

.

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