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Nissan Xterra. Manual - part 177

WATER PUMP

CO-23

< REMOVAL AND INSTALLATION >

[VQ40DE]

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.

12. 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

PBIC2836E

PBIC2863E

JLC357B

SLC943A

CO-24

< REMOVAL AND INSTALLATION >

[VQ40DE]

WATER PUMP

1. Install new O-rings to water pump.

CAUTION:

Do not reuse O-rings.

NOTE:

• 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

WATER PUMP

CO-25

< REMOVAL AND INSTALLATION >

[VQ40DE]

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 a suitable tool.

Use Genuine RTV Silicone Sealant or equivalent. Refer to

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

CO-21, "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) (1).

Use Genuine RTV Silicone Sealant or equivalent. Refer to

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-11, "Changing Engine Coolant"

and

CO-10, "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 engine coolant leaks. Refer to

CO-10, "System Inspection"

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

• Check and adjust engine coolant level. Refer to

MA-12, "Fluids and Lubricants"

SLC446B

PBIC2663E

Water drain plug (front)

: 9.8 N·m (1.0 kg-m, 87 in-lb)

ALBIA0679ZZ

CO-26

< REMOVAL AND INSTALLATION >

[VQ40DE]

WATER INLET AND THERMOSTAT ASSEMBLY

WATER INLET AND THERMOSTAT ASSEMBLY

Exploded View

INFOID:0000000009484590

Removal and Installation

INFOID:0000000009484591

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

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 engine cooling fan (Motor driven type). Refer to

CO-19, "Removal and Installation (Motor driven

type)"

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

CAUTION:

• Do not disassemble water inlet and thermostat assembly.

• Replace water inlet and thermostat assembly as a unit.

INSPECTION AFTER REMOVAL

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

Water inlet and thermostat assembly

Gasket

To oil cooler

AWBIA1156GB

SLC962AB

Content .. 175 176 177 178 ..