Nissan Pathfinder. Manual — part 839
LU-12
< REMOVAL AND INSTALLATION >
OIL PUMP
REMOVAL AND INSTALLATION
OIL PUMP
Removal and Installation
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REMOVAL
1. Remove the engine and transmission assembly from the vehicle. Refer to
(2WD) or
EM-107, "4WD : Removal and Installation"
(4WD).
2. Remove the upper oil pan. Refer to
EM-37, "Removal and Installation (Upper Oil Pan)"
3. Remove the timing chain. Refer to
EM-62, "Removal and Installation"
4. Remove oil pump assembly.
INSTALLATION
Installation is in the reverse order of removal.
Disassembly and Assembly
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CAUTION:
Before assembly, apply new engine oil to the parts as shown.
DISASSEMBLY
1. Remove the oil pump cover.
2. Remove inner rotor and outer rotor from oil pump housing.
CAUTION:
The outer rotor has directional vanes in relation to the rotation of the oil pump shaft. Note the
outer rotor vane direction for assembly.
3. Remove oil strainer from oil pump housing.
4. After removing regulator plug, remove spring and regulator valve.
INSPECTION AFTER DISASSEMBLY
Clearance of Oil Pump Parts
AWBIA1641ZZ
1.
Oil pump housing
2.
Oil pump outer rotor
3.
Oil pump inner rotor
4.
Oil pump cover
5.
Regulator valve O-ring
6.
Regulator valve set
7.
Regulator valve
8.
Regulator valve spring
9.
Regulator valve plug
10. Oil strainer
OIL PUMP
LU-13
< REMOVAL AND INSTALLATION >
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• Measure clearance with feeler gauge.
• Clearance between outer rotor and oil pump body (position 1).
• Tip clearance between inner rotor and outer rotor (position 2).
• Measure clearance with feeler gauge and straightedge.
• Side clearance between inner rotor and oil pump body (position 3).
• Side clearance between outer rotor and oil pump body (position 4).
• Calculate the clearance between inner rotor and oil pump body as follows:
1. Measure the outer diameter of protruded portion of inner rotor
(position A).
2. Measure the inner diameter of oil pump body with inside
micrometer (position B).
(clearance 5) = (inner diameter of oil pump body B) – (outer
diameter of inner rotor A)
3. If out of specifications, replace oil pump assembly.
Regulator Valve
1. Visually inspect components for wear and damage.
2. Check oil pressure regulator valve sliding surface and valve
spring.
3. Coat regulator valve with engine oil. Check that it falls smoothly
into the valve hole by its own weight.
If damaged, replace oil pump assembly.
Regulator Valve Clearance
Standard
:
Standard
:
SLC932A
Standard
:
Standard
:
SLC933A
Standard
:
SLC934AB
SLC251B
LU-14
< REMOVAL AND INSTALLATION >
OIL PUMP
(Clearance 6) = D (Valve hole diameter) – E (Outer diameter of
valve)
If it exceeds the standard, replace the oil pump assembly.
CAUTION:
• Coat regulator valve with engine oil.
• Check that it falls smoothly into the valve hole by its own
weight.
Assembly
Assembly is in the reverse order of disassembly.
• Assemble the outer rotor in the correct vane orientation to rotation
as noted during disassembly and the inner rotor with the groove on
the oil pump cover side.
CAUTION:
• Do not reuse O-ring.
• Before assembly apply new engine oil to the parts as speci-
fied.
Standard
SLC935AA
SLC324B
OIL COOLER
LU-15
< REMOVAL AND INSTALLATION >
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OIL COOLER
Removal and Installation
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WARNING:
Be careful not to burn yourself, as the engine oil may be hot.
CAUTION:
• When removing oil cooler, prepare a shop cloth to absorb any engine oil leaks or spillage.
• Completely wipe off any engine oil that adheres to the engine and the vehicle.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-
ing.
AWBIA1199GB
1.
Connector bolt
2.
Copper gasket
3.
Water drain plug
4.
Water pipe
5.
Bracket
6.
Clamp
7.
Water hose
8.
Relief valve
9.
Oil cooler O-Ring
10. Oil cooler
11.
Connector bolt
12. Oil filter
13. Water hose
14.
Water pipe
15. Water hose
A.
To water connector
B.
Refer to
: Engine front
Sealing point
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