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VALVES
1
2
3
4
5
6
7
8
9
10
4.
a
5.
a
VALVE LAPPING
1.
2.
Measure:
• Valve face contact width "a"
Make sure that the contact width along the entire
valve face is within specifications.
Valve face contact width (Intake):
0.9–1.1 mm (0.0354–0.0433 in)
Valve face contact width (Exhaust):
0.9–1.1 mm (0.0354–0.0433 in)
Limit (Intake):
1.6 mm (0.063 in)
Limit (Exhaust):
1.6 mm (0.063 in)
Out
of
specification/rough/eccentric
Replace.
Measure:
• Valve seat contact width "a"
Make sure that the contact width along the entire
valve seat is within specifications.
Valve seat contact width (Intake):
0.9–1.1 mm (0.0354–0.0433 in)
Valve seat contact width (Exhaust):
0.9–1.1 mm (0.0354–0.0433 in)
Limit (Intake):
1.6 mm (0.063 in)
Limit (Exhaust):
1.6 mm (0.063 in)
Out
of
specification/rough/eccentric
Replace.
Apply a coarse lapping compound evenly on the valve
face. Lap the valve by tapping and rotating the valve
lapper clockwise and counterclockwise.
Clean off all of the lapping compound from the valve
face and valve seat. Apply fine lapping compound on
the valve face and lap the valve as described in step
1.
3-30
wear
wear
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