Nissan Pathfinder (2008 year). Manual — part 129
ENGINE COOLING FAN
CO-21
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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
.
AWBIA0148ZZ
CO-22
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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
.
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
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
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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
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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
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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
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-
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
• Start and warm up engine. Visually check there are no leaks of engine coolant.
PBIC2838E
SLC446B
Tool number
: WS39930000 (
—
)
PBIC2663E
CO-26
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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
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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
• Start and warm up engine. Visually check there are no leaks of engine coolant.
CO-28
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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
or
.
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
• 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
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