Nissan Xterra. Manual — part 366
EM-92
< REMOVAL AND INSTALLATION >
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CYLINDER HEAD
Exploded View
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Disassembly and Assembly
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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.
1.
Valve lifter
2.
Valve collet
3.
Valve spring retainer
4.
Valve spring
5.
Valve oil seal
6.
Valve spring seat
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)
PBIC2637E
Tool numbers
: KV10109220 (
—
)
: KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)
WBIA0578E
CYLINDER HEAD
EM-93
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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.
• Pull spark plug tube out of cylinder head using a suitable tool.
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.
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.
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
SEM085D
EM-94
< REMOVAL AND INSTALLATION >
[VQ40DE]
CYLINDER HEAD
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
.
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. Refer to
EM-16, "Removal and Installation"
.
Inspection After Disassembly
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VALVE DIMENSIONS
• Check dimensions of each valve. Refer to
• If dimensions are out of the standard, replace valve and check the valve seat contact.
VALVE GUIDE CLEARANCE
Valve Stem Diameter
Measure the diameter of valve stem with micrometer.
Valve Guide Inner Diameter
Measure the inner diameter of valve guide with inside micrometer.
Tool numbers
: KV10109220 (
—
)
: KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)
WBIA0578E
Standard press-fit height (H)
: 38.1 - 39.1 mm (1.500 - 1.539 in)
PBIC2638E
Standard
Intake
: 5.965 - 5.980 mm (0.2348 - 0.2354 in)
Exhaust
: 5.955 - 5.970 mm (0.2344 - 0.2350 in)
SEM938C
CYLINDER HEAD
EM-95
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Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) – (Valve stem diameter).
• If the calculated value exceeds the limit, replace valve and/or valve guide.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
1. To remove valve guide, heat cylinder head to 110
° to 130°C
(230
° to 266°F) by soaking in heated oil.
2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US
ton, 2.0 Imp ton) pressure] or hammer and suitable tool.
WARNING:
Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.
3. Ream cylinder head valve guide hole using suitable tool.
Standard
Intake and Exhaust
: 6.000 - 6.018 mm (0.2362 - 0.2369 in)
Valve guide clearance:
Standard
Intake
: 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust : 0.030 - 0.063 mm (0.0012 - 0.0025 in)
Limit
Intake
: 0.08 mm (0.003 in)
Exhaust : 0.09 mm (0.004 in)
SEM008A
SEM931C
Valve guide hole diameter (for service parts):
Intake and exhaust
: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM932C
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