Nissan Xterra. Manual — part 177
WATER PUMP
CO-23
< 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.
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
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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 a suitable tool.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-21, "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
.
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
GI-21, "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-11, "Changing Engine Coolant"
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
• 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
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.
1.
Water inlet and thermostat assembly
2.
Gasket
3.
To oil cooler
AWBIA1156GB
SLC962AB
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