Nissan Frontier. Manual - part 992

OIL COOLER

LU-29

< REMOVAL AND INSTALLATION >

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*Power steering fluid, brake fluid, etc.

Fuel

Leakage

Leakage

Leakage

Exhaust gas

—

Leakage

—

Item

Before starting engine

Engine running

After engine stopped

LU-30

< REMOVAL AND INSTALLATION >

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OIL PUMP

OIL PUMP

Exploded View

INFOID:0000000009479906

Removal and Installation

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REMOVAL

1. Disconnect the battery negative terminal. Refer to 

PG-83, "Removal and Installation"

.

2. Remove the RH and LH wheels and tires. Refer to 

WT-48, "Adjustment"

.

3. Remove the RH and LH front fender protectors. Refer to 

EXT-25, "Removal and Installation"

.

4. Remove the air duct and resonator assembly and the air cleaner case (upper). Refer to 

EM-141,

"Exploded View"

.

5. Remove timing chain (primary) only. Refer to 

EM-176, "Removal and Installation"

.

6. Remove the oil pump assembly.

INSTALLATION

Installation is in the reverse order of removal, paying attention to the following.

• When installing, align crankshaft flat faces with inner rotor flat faces.

INSPECTION AFTER INSTALLATION

• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required

quantity, fill to the specified level. Refer to 

MA-16, "FOR USA AND CANADA : Fluids and Lubricants"

 (United

States and Canada) and 

MA-18, "FOR MEXICO : Fluids and Lubricants"

 (Mexico).

• Use procedure below to check for fuel leakage.

• Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leak-

age at connection points.

• Start engine. With engine speed increased, check again for fuel leakage at connection points.

• Run engine to check for unusual noise and vibration.

NOTE:

If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide

may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop

after hydraulic pressure rises.

• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids including

engine oil and engine coolant.

• Bleed air from passages in lines and hoses, such as in cooling system.

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

OIL PUMP

LU-31

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• 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-32

< UNIT DISASSEMBLY AND ASSEMBLY >

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OIL PUMP

UNIT DISASSEMBLY AND ASSEMBLY

OIL PUMP

Disassembly and Assembly

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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.

• 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

Body to outer rotor (position 1)
: Refer to 

LU-34, "Standard and Limit"

.

Inner rotor to outer rotor tip (position 2)
: Refer to 

LU-34, "Standard and Limit"

.

PBIC2827E

Body to inner rotor (position 3)
: Refer to 

LU-34, "Standard and Limit"

.

Body to outer rotor (position 4)
: Refer to 

LU-34, "Standard and Limit"

.

PBIC2828E

PBIC0821E

Inner rotor to brazed portion of housing 
clearance
: Refer to 

LU-34, "Standard and Limit"

.