Nissan Pathfinder (2008 year). Manual - part 380

CAMSHAFT

EM-203

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1.

Check engine oil level. Refer to 

LU-24, "Inspection"

.

2.

Perform the following procedure so as to prevent the engine from being unintentionally started while
checking.

a.

Release fuel pressure. Refer to 

EC-948, "Fuel Pressure Check"

.

b.

Disconnect ignition coil and injector harness connectors if practical.

3.

Remove IVT control solenoid valve.

4.

Crank engine, and then make sure that engine oil comes out from IVT control cover oil hole. End cranking
after checking.

WARNING:

Be careful not to touch rotating parts (drive belts, idler pulley, and crankshaft pulley, etc.).

CAUTION:

• Engine oil may squirt from IVT control solenoid valve installation hole during cranking. Use a

shop cloth to prevent engine oil from splashing on worker, engine components and vehicle. 

• Do not allow engine oil to get on rubber components such as drive belts or engine mount insula-

tors. Immediately wipe off any splashed engine oil.

5.

Clean oil groove between oil strainer and IVT control solenoid valve if engine oil does not come out from
IVT control valve cover oil hole. Refer to 

LU-23, "System Chart"

.

6.

Remove components between IVT control solenoid valve and camshaft sprocket (INT), and then check
each oil groove for clogging.
• Clean oil groove if necessary. 

7.

After inspection, installation of the remaining components is in the reverse order of removal.

EM-204

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OIL SEAL

OIL SEAL

Removal and Installation of Valve Oil Seal

INFOID:0000000001282030

REMOVAL

1.

Remove the camshaft relating to the valve oil seal to be removed. Refer to 

EM-193, "Removal and Instal-

lation"

.

2.

Remove the valve lifters. Refer to 

EM-193, "Components"

.

• Correctly identify the location where each part is removed from. Keep parts organized to avoid mixing

them up.

3.

Turn the crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from
dropping into the cylinder.

4.

Remove the valve collet using Tool. 

CAUTION:

Do not damage the valve lifter holes.

5.

Remove the valve spring retainer and valve spring.

CAUTION:

Do not remove the valve spring seat from the valve spring.

6.

Remove the valve oil seal using Tool.

INSTALLATION

Installation is in the reverse order of removal.
• Install the valve oil seal using Tool.

• Apply new engine oil on the new valve oil seal joint and seal lip.
• Install the valve oil seal to the specified height "H".

Removal and Installation of Front Oil Seal

INFOID:0000000001282031

REMOVAL

1.

Remove the air dam using power tool.

2.

Remove the engine undercover using power tool.

3.

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

EM-165,

"Removal and Installation"

.

Tool number

: KV10116200 (J-26336-A)

: KV10115900 (J-26336-20)

: KV10109220 (

—

)

WBIA0578E

Tool number

: KV10107902 (J-38959)

WBIA0478E

Tool number

: KV10115600 (J-38958)

Height "H" (without valve spring installed)

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

WBIA0490E

OIL SEAL

EM-205

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4.

Remove the radiator assembly. Refer to 

CO-43, "Removal and Installation"

.

5.

Remove the cooling fan (crankshaft driven type). Refer to 

CO-46, "Removal and Installation (Crankshaft

Driven Type)"

.

6.

Remove the crankshaft pulley.

a.

Remove the crankshaft pulley from the crankshaft using suitable
tool.
• Set the bolts in the two bolt holes [M6 x 1.0 mm (0.04 in)] on

the front surface.
NOTE:
The dimension between the centers of the two bolt holes is 61
mm (2.40 in).

7.

Remove the front oil seal using suitable tool.

CAUTION:

Do not damage front cover and oil pump drive spacer.

INSTALLATION

1.

Apply new engine oil to both the oil seal lip and dust seal lip of the new front oil seal.

2.

Install the front oil seal.
• Install the front oil seal so that each seal lip is oriented as

shown.

• Press-fit until the front oil seal is level with the front cover

using suitable tool.

CAUTION:

• Do not damage front cover and crankshaft.
• Press-fit straight and avoid causing burrs or tilting oil

seal.

3.

Installation of the remaining components is in the reverse order of removal.

KBIA2477E

SBIA0359E

SEM715A

SBIA0359E

EM-206

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OIL SEAL

Removal and Installation of Rear Oil Seal

INFOID:0000000001282032

REMOVAL

1.

Remove the transmission assembly. Refer to 

TM-225, "2WD : Removal and Installation"

 (2WD models) or

TM-228, "4WD : Removal and Installation"

 (4WD models).

2.

Lock the drive plate using Tool A. 

CAUTION:

• Do not damage the drive plate. Especially, avoid deform-

ing and damaging the signal plate teeth (circumference
position).

• Keep magnetic materials away from signal plate.

3.

Remove the drive plate.

CAUTION:

Place the drive plate with the signal plate surface facing upward.
NOTE:
Remove the bolts diagonally.

4.

Remove the rear oil seal using suitable tool.

CAUTION:

Do not damage crankshaft or oil seal retainer surface.

INSTALLATION

1.

Apply new engine oil to both the oil seal lip and dust seal lip of the new rear oil seal.

2.

Install the rear oil seal.
• Install the rear oil seal so that each seal lip is oriented as

shown.

Tool number

: 

—

 (J-47245)

LBIA0455E

WBIA0437E

SEM715A

OIL SEAL

EM-207

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• Press-fit the rear oil seal using suitable tool.

CAUTION:

• Do not damage the crankshaft or oil seal retainer.
• Press-fit the oil seal straight to avoid causing burrs or

tilting.

• Do not touch grease applied onto the oil seal lip.
• Do not damage or scratch the outer circumference of

the rear oil seal.

• Tap until flush with the front edge of the oil seal retainer. 

3.

Installation of the remaining components is in the reverse order of removal.

WBIA0438E

EM-208

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CYLINDER HEAD

CYLINDER HEAD

Removal and Installation

INFOID:0000000001282034

REMOVAL

1.

Remove the engine assembly from the vehicle. Refer to 

EM-218, "Removal and Installation"

.

2.

Remove the following components and related parts:
• Drive belt auto tensioner drive belts and idler pulley. Refer to 

EM-153, "Removal and Installation"

• Thermostat housing and water piping. Refer to 

CO-51, "Removal and Installation"

.

• Fuel tube and fuel injector assembly. Refer to 

EM-180, "Removal and Installation"

. 

• Starter. Refer to 

STR-17, "Removal and Installation"

.

• Rocker cover. Refer to 

EM-178, "Removal and Installation"

.

• Generator and generator bracket. Refer to 

CHG-21, "Removal and Installation"

.

• Oil pan and oil strainer. Refer to 

EM-173, "Removal and Installation"

. 

3.

Remove the crankshaft pulley, front cover, oil pump, and timing chain. Refer to 

EM-185, "Removal and

Installation"

.

4.

Remove the camshaft sprockets and camshafts. Refer to 

EM-193, "Removal and Installation"

.

5.

Remove the cylinder head bolts in reverse of order shown.

INSPECTION AFTER REMOVAL

 Cylinder Head Bolts Diameter

1.

Harness bracket

2.

Engine coolant temperature sensor

3.

Washer

4.

Cylinder head gasket (LH)

5.

Cylinder head (RH)

6.

Cylinder head bolt

7.

Cylinder head gasket (RH)

8.

Cylinder head (LH)

KBIA2528E

PBIC0068E

CYLINDER HEAD

EM-209

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• Cylinder head bolts are tightened by plastic zone tightening

method. Whenever the size difference between "d1" and "d2"
exceeds the limit, replace the bolt with a new one. 

• If reduction of diameter appears in a position other than d2, use it

as d2 point.

INSTALLATION

1.

Install a new cylinder head gasket.

2.

Install the cylinder head. Follow the steps below to tighten the
bolts in the numerical order shown.

CAUTION:

• If cylinder head bolts are re-used, check their diameters

before installation. Follow the "Cylinder Head Bolts Diam-
eter" procedure.

a.

Apply engine oil to threads and seating surface of the bolts.

b.

Measure the tightening angle using Tool.

CAUTION:

Measure the tightening angle using Tool. Do not measure
visually. 

3.

Installation of the remaining components is in the reverse order of removal.

INSPECTION AFTER INSTALLATION

Inspection for Leaks

The following are procedures for checking fluid leaks, lubricant leaks and exhaust gases leaks.
• 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-10, "Fluids and Lubricants"

.

• 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.
• Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gases, or any oil/fluids includ-

ing engine oil and engine coolant.

• Bleed air from lines and hoses of applicable lines, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the

specified level, if necessary.

Summary of the inspection items:

Limit (d1 - d2)

: 0.18 mm (0.0071 in)

KBIA0189E

Step a

: 98.1 N·m (10 kg-m, 72 ft-lb) 

Step b

:Loosen in the reverse order of tightening.

Step c

: 44.1 N·m (4.5 kg-m, 33 ft-lb)

PBIC0068E

Tool number

: KV10112100 (BT-8653-A)

Step d

: 60

°

 clockwise

Step e

: 60

°

 clockwise

WBIA0603E

Item

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

EM-210

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CYLINDER HEAD

* Transmission fluid, power steering fluid, brake fluid, etc.

Disassembly and Assembly

INFOID:0000000001282035

DISASSEMBLY

1.

Remove the spark plug. Refer to 

EM-156, "Removal and Installation"

.

2.

Remove the valve lifter.
• Identify the installation positions, and store them without mixing them up.

3.

Remove the valve collet using Tool. 

CAUTION:

When working, take care not to damage valve lifter holes.

4.

Remove the valve spring retainer, valve spring and valve spring
seat.

5.

Inspect the valve guide clearance. Refer to 

EM-212, "Inspection

After Disassembly"

.

Engine oil

Level

Leakage

Level

Other oils and fluid*

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

Exhaust gases

—

Leakage

—

1.

Spark plug

2.

Valve lifter

3.

Valve collet

4.

Valve spring retainer

5.

Valve spring

6.

Valve spring seat

7.

Valve oil seal

8.

Valve guide

9.

Valve seat

10.

Valve (INT)

11.

Valve (EXH)

12.

Cylinder head (LH bank)

13.

Spark plug tube

14.

Cylinder head (RH bank)

WBIA0470E

Tool number

: KV10116200 (J-26336-A)

: KV10115900 (J-26336-20)

: KV10109220 (

—

)

WBIA0578E