Nissan Pathfinder (2008 year). Manual - part 366

OIL SEAL

EM-91

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5.

Remove front oil seal using suitable tool.

CAUTION:

Be careful not to damage front timing chain case and crank-
shaft.

INSTALLATION

1.

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

2.

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

• Press-fit until the height of front oil seal is level with the mount-

ing surface using suitable tool.

- Suitable drift: outer diameter 60 mm (2.36 in), inner diameter

50 mm (1.97 in).

CAUTION:

• Be careful not to damage front timing chain case and

crankshaft.

• Press-fit straight and avoid causing burrs or tilting oil

seal.

3.

Installation is in the reverse order of removal after this step.

Removal and Installation of Rear Oil Seal

INFOID:0000000001281991

REMOVAL

1.

Remove transmission assembly. Refer to 

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

 (2WD models), 

TM-

228, "4WD : Removal and Installation"

 (4WD models).

2.

Remove rear oil seal with a suitable tool.

CAUTION:

Be careful not to damage crankshaft and cylinder block.

INSTALLATION

PBIC2931E

SEM715A

PBIC2931E

PBIC2932E

EM-92

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OIL SEAL

1.

Apply new engine oil to new rear oil seal joint surface and seal lip.

2.

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

• Install new rear oil seal using Tool.

CAUTION:

• Be careful not to damage crankshaft and cylinder block.
• Press-fit oil seal straight to avoid causing burrs or tilt-

ing.

• Do not touch grease applied onto oil seal lip.

• Press in rear oil seal to the position as shown.

3.

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

SEM715A

Tool number

: KV991J0120 (J-47128)

LBIA0454E

SBIA0281E

CYLINDER HEAD

EM-93

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CYLINDER HEAD

Removal and Installation

INFOID:0000000001281993

REMOVAL

1.

Remove camshaft. Refer to 

EM-81, "Removal and Installation"

.

2.

Remove intake manifold. Refer to 

EM-29, "Removal and Installation"

.

3.

Remove exhaust manifold. Refer to 

EM-31, "Removal and Installation"

.

4.

Remove water inlet and thermostat assembly. Refer to 

CO-26, "Removal and Installation"

.

5.

Remove water outlet, water pipe and heater pipe. Refer to 

CO-28, "Removal and Installation"

.

1.

Rubber plug

2.

Cylinder head (left bank)

3.

Cylinder head bolt

4.

Cylinder head (right bank)

5.

Harness bracket

6.

Cylinder head gasket (right bank)

7.

Cylinder head gasket (left bank)

PBIC2934E

EM-94

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CYLINDER HEAD

6.

Remove cylinder head bolts in reverse order as shown using
commercial service tool and power tool to remove cylinder
heads (right and left banks).

7.

Remove cylinder head gaskets.

INSPECTION AFTER REMOVAL

Cylinder Head Bolts Outer Diameter

• 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 outer diameter appears in a position other than “d2”,

use it as “d2” point.

Cylinder Head Distortion

NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer to 

EM-117, "Inspec-

tion After Disassembly"

.

1.

Using suitable tool, wipe off oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.

CAUTION:

Do not allow gasket fragments to enter engine oil or engine coolant passages.

2.

At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions.

• If it exceeds the limit, replace cylinder head.

INSTALLATION

Tool number

: (J-24239-01)

PBIC2057E

Limit (“d1” – “d2”)

: 0.11 mm (0.0043 in)

PBIC2480E

Limit

: 0.1 mm (0.004 in)

SEM861E

CYLINDER HEAD

EM-95

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1.

Install new cylinder head gasket.

2.

Turn crankshaft until No. 1 piston is set at TDC.
• Crankshaft key should line up with the right bank cylinder cen-

ter line as shown.

3.

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

CAUTION:

If cylinder head bolts re-used, check their outer diameters
before installation. Refer to 

EM-93, "Removal and Installa-

tion"

 (Cylinder Head Bolts Outer Diameter).

4.

After installing cylinder head, measure distance between front
end faces of cylinder block and cylinder head (left and right
banks).

• If the measured value is out of the standard, re-install cylinder

head.

SEM532G

Step a

: 98 N·m (10 kg-m, 72 ft-lb) 

Step b

: Loosen to 0 N·m in the reverse order of tight-
ening.

Step c

: 39.2 N·m (4.0 kg-m, 29 ft-lb)

Step d

: 90

°

 clockwise

Step e

: 90

°

 clockwise

PBIC2057E

WBIA0581E

Standard

: 14.1 - 14.9 mm (0.555 - 0.587 in) 

EMQ0662D

EM-96

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CYLINDER HEAD

5.

Installation of the remaining parts 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:

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

Disassembly and Assembly

INFOID:0000000001281994

Item

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Other oils and fluid*

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

Exhaust gases

—

Leakage

—

PBIC2637E

1.

Valve lifter

2.

Valve collet

3.

Valve spring retainer

4.

Valve spring

5.

Valve oil seal

6.

Valve spring seat

CYLINDER HEAD

EM-97

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DISASSEMBLY

1.

Remove spark plug.

2.

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

3.

Remove valve collet.
• Compress valve spring and remove valve collet with magnet

hand using Tool.

CAUTION:

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

4.

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

5.

Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store them without mixing them up.

6.

Remove valve oil seals using Tool.

7.

If valve seat must be replaced, refer to 

EM-98, "Inspection After Disassembly"

.

8.

If valve guide must be replaced, refer to 

EM-98, "Inspection After Disassembly"

.

9.

Remove spark plug tube, as necessary.
• Using pair of pliers, pull spark plug tube out of cylinder head. 

CAUTION:

• Take care not to damage cylinder head.
• Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it unless

absolutely necessary.

ASSEMBLY

1.

When valve guide is removed, install it. Refer to 

EM-98, "Inspection After Disassembly"

.

2.

When valve seat is removed, install it. Refer to 

EM-98, "Inspection After Disassembly"

.

3.

Install valve oil seals using Tool.

4.

Install valve spring seat.

5.

Install valves.
• Install it in the original position.

7.

Valve guide

8.

Spark plug

9.

Spark plug tube

10. Cylinder head (right bank)

11.

Valve seat

12. Valve (EXH)

13.  Valve (INT)

14. Cylinder head (left bank)

Tool numbers

: KV10109220 (

—

)

: KV10116200 (J-26336-A)

: KV10115900 (J-26336-20)

WBIA0578E

Tool number

: KV10107902 (J-38959)

WBIA0489E

Tool number

:

—

 (J-39386)

Height "H" (Without valve spring seat installed)

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

WBIA0490E

EM-98

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CYLINDER HEAD

NOTE:
Larger diameter valves are for intake side.

6.

Install valve spring (uneven pitch type).
• Install narrow pitch end (paint mark) to cylinder head side

(valve spring seat side).

7.

Install valve spring retainer.

8.

Install valve collet.
• Compress valve spring using Tool, attachment and adapter

using Tool. Install valve collet with magnet hand.

CAUTION:

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

• Tap valve stem edge lightly with plastic hammer after installa-

tion to check its installed condition.

9.

Install valve lifter.
• Install it in the original position.

10. Install spark plug tube.

• Press-fit spark plug tube as follows:

a.

Remove old liquid gasket adhering to cylinder head mounting hole.

b.

Apply sealant to area within approximately 12 mm (0.47 in) from edge of spark plug tube press-fit side.
Use Genuine High Strength Locking Sealant or equivalent. Refer to 

GI-26, "Recommended Chemi-

cal Products and Sealants"

.

c.

Press-fit spark plug tube so that its height “H” is as specified
using suitable drift.

CAUTION:

• When press-fitting, take care not to deform spark plug

tube.

• After press-fitting, wipe off liquid gasket protruding onto

cylinder-head upper face.

11. Install spark plug.

Inspection After Disassembly

INFOID:0000000001281995

VALVE DIMENSIONS

• Check dimensions of each valve. For dimensions, refer to 

EM-132, "Standard and Limit"

.

• If dimensions are out of the standard, replace valve and check the valve seat contact. Follow the "VALVE

SEAT CONTACT" procedure.

VALVE GUIDE CLEARANCE

SEM085D

Tool numbers

: KV10109220 (

—

)

: KV10116200 (J-26336-A)

: KV10115900 (J-26336-20)

WBIA0578E

Standard press-fit height “H”

: 38.1 - 39.1 mm (1.500 - 1.539 in)

PBIC2638E