Nissan Xterra. Manual — part 493
OIL PUMP
LU-15
< REMOVAL AND INSTALLATION >
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• Bleed air from passages in lines and hoses, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to spec-
ified level, if necessary.
• Summary of the inspection items:
*Power steering fluid, brake fluid, etc.
Item
Before starting engine
Engine running
After engine stopped
Engine coolant
Level
Leakage
Level
Engine oil
Level
Leakage
Level
Transmission/
transaxle fluid
A/T and CVT Models
Leakage
Level/Leakage
Leakage
M/T Models
Level/Leakage
Leakage
Level/Leakage
Other oils and fluids*
Level
Leakage
Level
Fuel
Leakage
Leakage
Leakage
Exhaust gas
—
Leakage
—
LU-16
< UNIT DISASSEMBLY AND ASSEMBLY >
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OIL PUMP
UNIT DISASSEMBLY AND ASSEMBLY
OIL PUMP
Disassembly and Assembly
INFOID:0000000009484425
DISASSEMBLY
1. Remove oil pump cover.
2. Remove inner rotor and outer rotor from oil pump body.
3. Remove the regulator valve plug, regulator valve spring and regulator valve.
INSPECTION AFTER DISASSEMBLY
Clearance of Oil Pump Parts
• Measure radial clearance using a suitable tool.
1.
Oil pump body
2.
Oil pump outer rotor
3.
Oil pump inner rotor
4.
Oil pump cover
5.
Regulator valve plug
6.
Regulator valve spring
7.
Regulator valve spring
8.
Regulator valve
PBIC2826E
Body to outer rotor (position 1)
Refer to
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Inner rotor to outer rotor tip (position 2)
Refer to
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PBIC2827E
OIL PUMP
LU-17
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• Measure side clearance using suitable tools.
• Calculate the clearance between inner rotor and oil pump body as
follows.
1. Measure the inner diameter of oil pump body to brazed portion
(position 5) using suitable tool.
2. Measure the outer diameter of protruded portion of inner rotor
(position 6) using suitable tool.
3. Calculate the clearance using the following formula.
• (Clearance) = (Inner diameter of oil pump body) - (Outer diameter of inner rotor)
Regulator Valve Clearance
Check regulator valve to oil pump cover clearance using the following formula.
• (Clearance) = D
1
(Valve hole diameter) - D
2
(Outer Diameter of
valve)
CAUTION:
• Coat regulator valve with engine oil.
• Check that it falls smoothly into the regulator valve hole by its
own weight.
ASSEMBLY
Installation is in the reverse order of removal.
NOTE:
• Install oil pump inner rotor with the groove facing the oil pump
cover side.
• Install the oil pump outer rotor with the punch mark facing the oil
pump cover side.
Body to inner rotor (position 3)
Refer to
.
Body to outer rotor (position 4)
Refer to
.
PBIC2828E
PBIC0821E
Inner rotor to brazed portion of housing
clearance
Refer to
.
Regulator valve to oil pump cover
Refer to
.
PBIC2829E
PBIC2830E
LU-18
< SERVICE DATA AND SPECIFICATIONS (SDS)
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Standard and Limit
INFOID:0000000009484426
OIL PRESSURE
Unit: kPa (kg/cm
2, psi)
*: Engine oil temperature at 80
°C (176°F)
OIL PUMP
Unit: mm (in)
REGULATOR VALVE
Unit: mm (in)
ENGINE OIL CAPACITY (APPROXIMATE)
Unit: (US qt, Imp qt)
Engine speed
Approximate discharge oil pressure*
Idle speed
More than 98 (1.0, 14)
2,000 rpm
More than 294 (3.0, 43)
6,000 rpm
More than 392 (4.0, 56.8)
Body to outer rotor (Position 1)
0.120 - 0.195 (0.0047 - 0.0077)
Inner rotor to outer rotor tip (Position 2)
0.060 - 0.160 (0.0024 - 0.0063)
Body to inner rotor (Position 3)
0.030 - 0.070 (0.0012 - 0.0028)
Body to outer rotor (Position 4)
0.050 - 0.090 (0.0020 - 0.0035)
Inner rotor to brazed portion of housing
0.045 - 0.091 (0.0018 - 0.0036)
Regulator valve to oil pump cover
0.025 - 0.070 (0.0010 - 0.0028)
Drain and refill
With oil filter change
5.1 (5-3/8, 4-1/2)
Without oil filter change
4.8 (5-1/8, 4-1/4)
Dry engine (Overhaul)
6.3 (6-5/8, 5-1/2)
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