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
.
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
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