Nissan Pathfinder. Manual - part 563

CYLINDER HEAD

EM-91

< REMOVAL AND INSTALLATION >

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Cylinder head bolts are tightened by degree rotation tight-

ening method. Whenever the size difference between d1

and d2 exceeds the limit, replace the bolts with new ones.

• Lubricate threads and seat surfaces of the bolts with new

engine oil.

4. Install the cylinder heads on the cylinder block. Tighten the cylin-

der head bolts in the five steps in the numerical order as shown

using Tool.

• Tightening procedure:

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

Limit (d1 - d2)

: 0.11 mm (0.0043 in)

SEM957E

Tool Number

: KV10112100 (BT-8653-A)

SEM879EA

Cylinder head bolts
Step a

: 98.1 N·m (10 kg-m, 72 ft-lb) in order

Step b

: Loosen in the reverse order of tightening

Step c  : 39.2 N·m (4.0 kg-m, 29 ft-lb) in order 
Step d

: 103

° degrees rotation clockwise in order

Step e

: 103

° degrees rotation clockwise in order

SEM877EA

SEM878EA

EM-92

< REMOVAL AND INSTALLATION >

CYLINDER HEAD

Disassembly and Assembly

INFOID:0000000009177937

CAUTION:

• When installing camshafts, chain tensioners, oil seals, or other sliding parts, lubricate contacting

surfaces with new engine oil.

• Apply new engine oil to threads and seat surface when installing cylinder head, camshaft sprocket,

crankshaft pulley, and camshaft bracket.

• Attach tags to valve lifters so as not to mix them up.

ALBIA0261ZZ

1.

Valve collet

2.

Valve spring retainer

3.

Valve spring

4.

Valve oil seal

5.

Valve spring seat

6.

Valve guide

7.

Cylinder head

8.

Valve seat (EXH)

9.

Valve seat (INT)

10. Valve (EXH)

11. Valve (INT)

CYLINDER HEAD

EM-93

< REMOVAL AND INSTALLATION >

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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 bore.

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-94, "Inspection After Disassembly"

.

8. If valve guide must be replaced, refer to 

EM-94, "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-94, "Inspection After Disassembly"

.

2. When valve seat is removed, install it. Refer to 

EM-94, "Inspection After Disassembly"

.

3. Install valve oil seals using Tool.

4. Install valve spring seat.
5. Install valves.

• Install it in the original position.

NOTE:

Larger diameter valves are for intake side.

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-94

< REMOVAL AND INSTALLATION >

CYLINDER HEAD

6. Install valve spring (uneven pitch type) with 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.

Install valve collet with magnet hand.

CAUTION:

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

• 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 mount 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-22, "Recommended Chemi-

cal Products and Sealants"

.

c.

Press-fit spark plug tube so that its height (H) is as specified in

using suitable tool.

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. Refer to 

EM-16, "Removal and Installation"

.

Inspection After Disassembly

INFOID:0000000009177938

CYLINDER HEAD DISTORTION

Clean the surface of the cylinder head. Use a reliable straightedge and feeler gauge to check the flatness of

cylinder head surface.

SEM085D

Tool numbers

: KV10109220 (

—

)

: KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)

WBIA0578E

Press-fit height (H) : 38.2 +0.9/- 0.5 mm (1.5 +0.035 

/ -0.020 in)

PBIC2638E