Nissan Pathfinder (2010 year). Manual — part 128
CO-22
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[VQ40DE]
WATER PUMP
WATER PUMP
Exploded View
INFOID:0000000005260564
Removal and Installation
INFOID:0000000005260565
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.
REMOVAL
1. Remove engine front under cover. Refer to
EXT-14, "Removal and Installation"
.
2. Drain engine coolant. Refer to
.
• Remove water drain plug (front).
CAUTION:
• Perform this step when engine is cold.
• Do not spill engine coolant on timing chain and drive belt.
3. Remove the engine room cover. Refer to
EM-25, "Removal and Installation"
4. Remove air duct and resonator assembly. Refer to
EM-26, "Removal and Installation"
5. Remove drive belt. Refer to
EM-14, "Removal and Installation"
.
6. Remove radiator hose (upper).
7. Remove coolant reservoir hose from the radiator.
8. Remove engine cooling fan (motor driven type). Refer to
CO-20, "Removal and Installation (Motor driven
9. Remove engine cooling fan (Crankshaft driven type) and fan bracket. Refer to
Installation (Crankshaft driven type)"
.
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
2010 Pathfinder
WATER PUMP
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10. Remove chain tensioner cover and water pump cover from front
timing chain case, using Tool.
11. 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.
12. Remove water pump as follows:
Tool number
: KV10111100 (J-37228)
PBIC2662E
PBIC2835E
PBIC2834E
PBIC2836E
2010 Pathfinder
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WATER PUMP
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.
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
• Visually check that there is no significant dirt or rust on the water pump body and vane.
• Make sure there is no looseness in the vane shaft, and that it turns
smoothly when rotated by hand.
• 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.
PBIC2863E
JLC357B
SLC943A
PBIC2837E
2010 Pathfinder
WATER PUMP
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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.
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-14, "Recommended Chemical Products and Sealants"
.
CAUTION:
Attaching should be done within 5 minutes after coating.
c. Tighten bolts to specified torque. Refer to
.
PBIC1058E
PBIC2838E
SLC446B
Tool number
: WS39930000 ( — )
PBIC2663E
2010 Pathfinder
CO-26
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WATER PUMP
5. Installation of the remaining components is in the reverse order of removal.
• 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-14, "Recommended Chemical Prod-
•
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. Refer to
.
• Start and warm up engine. Visually check for leaks of engine coolant.
2010 Pathfinder
WATER INLET AND THERMOSTAT ASSEMBLY
CO-27
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WATER INLET AND THERMOSTAT ASSEMBLY
Exploded View
INFOID:0000000005260566
Removal and Installation
INFOID:0000000005260567
REMOVAL
1. Remove the engine under cover. Refer to
EXT-14, "Removal and Installation"
.
2. 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
.
4. Remove the radiator hose (upper) from the radiator.
5. Remove the coolant reservoir hose from the radiator.
6. Remove the fan shroud (lower) and (upper). Refer to
7. Disconnect radiator hose (lower) and oil cooler hose from water inlet and thermostat assembly.
8. Remove water inlet and thermostat assembly.
CAUTION:
• Do not disassemble water inlet and thermostat assembly.
• Replace water inlet and thermostat assembly as a unit, if
necessary.
INSPECTION AFTER REMOVAL
1. Check valve seating condition at ordinary room temperatures. It should seat tightly.
1.
Water inlet and thermostat assembly 2.
Gasket
PBIC2839E
SLC962AB
2010 Pathfinder
CO-28
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WATER INLET AND THERMOSTAT ASSEMBLY
2. Check valve operation.
• Place a thread so that it is caught in the valve of the thermo-
stat. Immerse fully in a container filled with water. Heat while
stirring.
• The valve opening temperature is the temperature at which
the valve opens and falls from the thread.
• Continue heating. Check the full-open lift amount.
• After checking the full-open lift amount, lower the water tem-
perature and check the valve closing temperature.
• If valve seating at ordinary room temperature, or measured values are out of standard, replace water inlet
and thermostat assembly.
INSTALLATION
Installation is in the reverse order of removal, paying attention to the following.
•
Do not spill engine coolant in engine room. Use rag to absorb engine coolant.
INSPECTION AFTER INSTALLATION
• Check for leaks of engine coolant. Refer to
.
• Start and warm up engine. Visually check for leaks of engine coolant.
SLC949A
Thermostat
Standard
Valve opening temperature
80.5 - 83.5
°
C (177 - 182
°
F)
Full-open lift amount
8.6 mm / 95
°
C (0.339 in / 203
°
F)
Valve closing temperature
77
°
C (171
°
F)
2010 Pathfinder
WATER OUTLET AND WATER PIPING
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WATER OUTLET AND WATER PIPING
Exploded View
INFOID:0000000005260568
Removal and Installation
INFOID:0000000005260569
REMOVAL
1. Remove the engine under cover. Refer to
EXT-14, "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 drive belts.
3. Remove the intake manifold collector. Refer to
EM-27, "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. Refer to
.
• Start and warm up engine. Visually check for 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
2010 Pathfinder
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