Nissan Pathfinder (2012 year). Manual — part 128
ENGINE COOLING FAN
CO-21
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• Check that the fan bracket shaft turns smoothly by hand and is not
excessively loose.
• If there are concerns, replace the fan bracket assembly.
INSTALLATION
Installation is in the reverse order of removal.
• Install cooling fan with its front mark “F” facing front of engine. Refer to
CO-20, "Removal and Installation
INSPECTION AFTER INSTALLATION
• Check for leaks of the engine coolant. Refer to
.
• Start and warm up the engine. Visually check for coolant leaks and repair if necessary.
Removal and Installation (Motor driven type)
INFOID:0000000007357914
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Remove the engine under cover. Refer to
EXT-15, "Removal and Installation"
.
2. Partially 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. Release the lower radiator shroud (2) from the upper radiator
shroud (1) and position aside.
• Release the tabs, pull lower radiator shroud (2) rearward and
down.
4. Remove engine room cover (if equipped). Refer to
EM-25, "Removal and Installation"
.
5. Remove air duct and resonator assembly. Refer to
EM-26, "Removal and Installation"
6. Remove upper radiator hose from radiator.
7. Remove reservoir tank hose from radiator shroud (upper) and radiator.
8. Remove the radiator shroud (upper) bolts and remove the radiator shroud (upper). Refer to
LBIA0422E
ALBIA0470ZZ
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2012 Pathfinder
CO-22
< REMOVAL AND INSTALLATION >
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ENGINE COOLING FAN
9. Disconnect harness connector from fan motor.
10. 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
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2012 Pathfinder
WATER PUMP
CO-23
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WATER PUMP
Exploded View
INFOID:0000000007357915
Removal and Installation
INFOID:0000000007357916
WARNING:
Never 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.
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.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
REMOVAL
1. Remove engine under cover. Refer to
EXT-15, "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 timing chain and drive belt.
3. Remove air duct and resonator assembly. Refer to
EM-26, "Removal and Installation"
4. Remove drive belt. Refer to
EM-14, "Removal and Installation"
.
5. Remove radiator hose (upper).
6. Remove coolant reservoir hose from the radiator.
7. Remove engine cooling fan (Motor driven type). Refer to
CO-21, "Removal and Installation (Motor driven
.
8. Set No. 1 cylinder at TDC.
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
August 2012
2012 Pathfinder
CO-24
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WATER PUMP
• Rotate crankshaft pulley clockwise to align timing mark (A)
(grooved line without color) with timing indicator (B).
9. Remove engine cooling fan (Crankshaft driven type). Refer to
CO-20, "Removal and Installation (Crank-
10. Remove water drain plug (front) (1) on the water pump side of
the cylinder block.
11. Remove chain tensioner cover and water pump cover from front
timing chain case, using Tool.
12. Remove timing chain tensioner (primary) as follows:
a. Loosen clip of timing chain tensioner (primary), and release
plunger stopper (1).
b. Depress plunger into tensioner body by pressing slack guide (2).
c.
Keep slack guide pressed and insert stopper pin through the
tensioner body hole and plunger groove (3) to hold plunger in.
AWBIA0719ZZ
ALBIA0679ZZ
Tool number
: KV10111100 (J-37228)
PBIC2662E
PBIC2835E
August 2012
2012 Pathfinder
WATER PUMP
CO-25
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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.
13. 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
1. Install new O-rings to water pump.
CAUTION:
Do not reuse O-rings.
NOTE:
PBIC2836E
PBIC2863E
JLC357B
SLC943A
August 2012
2012 Pathfinder
CO-26
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WATER PUMP
• 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
August 2012
2012 Pathfinder
WATER PUMP
CO-27
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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 Tool.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-14, "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).
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-14, "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-12, "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 coolant leaks. Refer to
.
• Start and warm up engine. Visually check for coolant leaks. Repair as necessary.
SLC446B
Tool number
: WS39930000 ( — )
PBIC2663E
Water drain plug (front)
: 9.8 N·m (1.0 kg-m, 87 in-lb)
ALBIA0679ZZ
August 2012
2012 Pathfinder
CO-28
< REMOVAL AND INSTALLATION >
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WATER INLET AND THERMOSTAT ASSEMBLY
WATER INLET AND THERMOSTAT ASSEMBLY
Exploded View
INFOID:0000000007357917
Removal and Installation
INFOID:0000000007357918
WARNING:
Never 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 the engine under cover. Refer to
EXT-15, "Removal and Installation"
.
2. Partially 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 shroud and 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.
1.
Water inlet and thermostat assembly 2.
Gasket
PBIC2839E
August 2012
2012 Pathfinder
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