Nissan Altima L32. Instruction — part 665
EM-196
< ON-VEHICLE REPAIR >
[VQ35DE]
CYLINDER HEAD
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-197, "Inspection After Disassembly"
.
8. If valve guide must be replaced, refer to
EM-197, "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-197, "Inspection After Disassembly"
2. When valve seat is removed, install it. Refer to
EM-197, "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
: KV10109230 (
—
)
: 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
CYLINDER HEAD
EM-197
< ON-VEHICLE REPAIR >
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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 with valve spring compressor, attach-
ment and adapter using Tool. Install valve collet with magnet
hand.
CAUTION:
When working, take care not to damage valve lifter holes.
• 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 in
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:0000000004202180
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
: KV10109230 (
—
)
: KV10116200 (J-26336-A)
: KV10115900 (J-26336-20)
WBIA0578E
Press-fit height (H)
: 37.7 - 38.7 mm (1.484 - 1.529 in)
PBIC2638E
EM-198
< ON-VEHICLE REPAIR >
[VQ35DE]
CYLINDER HEAD
Check along six positions as shown.
If beyond the specified limit, resurface or replace it.
The limit for cylinder head resurfacing is determined by the cyl-
inder block resurfacing.
After resurfacing cylinder head, check that camshaft rotates freely by hand. If resistance is felt, cylinder head
must be replaced.
VALVE GUIDE CLEARANCE
1. Measure valve deflection as shown. (Valve and valve guide
mostly wear in this direction.)
2. If it exceeds the limit, check valve to valve guide clearance.
a. Measure valve stem diameter and valve guide inner diameter.
.
b. Check that clearance is within specification.
(Valve guide clearance) = (Valve guide inner diameter) - (Valve
stem diameter)
c.
If it exceeds the limit, replace valve or valve guide.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
Head surface distortion
Limit
: 0.1 mm (0.004 in)
Standard
: Less than 0.03 mm
(0.0012 in)
Resurfacing Limit
Amount of cylinder head resurfacing is (A).
Amount of cylinder block resurfacing is (B).
The maximum limit
: A + B = 0.2 mm (0.008 in)
Nominal cylinder head height
: 126.3 - 126.5 mm (4.972 - 4.980 in)
SEM861E
Valve deflection limit (dial gauge reading)
Intake
: 0.24 mm (0.0094 in)
Exhaust
: 0.28 mm (0.0110 in)
SEM178F
Valve to valve guide clearance standard
Intake
: 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust
: 0.040 - 0.073 mm (0.0016 - 0.0029 in)
Valve to valve guide clearance limit
Intake
: 0.08 mm (0.0031 in)
Exhaust
: 0.1 mm (0.004 in)
SEM938C
CYLINDER HEAD
EM-199
< ON-VEHICLE REPAIR >
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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 the valve guide with a press [under a 20 kN (2.2 US
ton) pressure] or hammer and suitable tool.
3. Ream cylinder head valve guide hole.
4. Heat cylinder head to 110
° to 130°C (230° to 266°F) by soaking
in heated oil and press new valve guide from camshaft side into
the cylinder head to the dimensions as shown.
SEM008A
SEM931C
Valve guide hole diameter
(for service parts), intake
and exhaust
: 10.175 - 10.196 mm
(0.4006 - 0.4014 in)
SEM932C
Projection (L)
: 12.6 - 12.8 mm (0.496 - 0.504 in)
SEM950E
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