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VALVE
1
Out
Replace.
5.
Measure:
• Valve seat contact width "a"
Make sure that the contact width along the entire
valve seat is within specifications.
a
Out
Replace.
VALVE LAPPING
1.
Apply a coarse lapping compound evenly on the valve
face. Lap the valve by tapping and rotating the valve
lapper "1" clockwise and counterclockwise.
2.
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.
Once the contacting surface of the valve face is pol-
ished and becomes shiny, apply mechanic's blue lay-
out fluid to make sure that there are traces of even
contact in the center of the valve face.
3-25
Valve face contact width (Intake):
0.4–0.6 mm (0.0157–0.0236 in)
Valve face contact width (Exhaust):
0.4–0.6 mm (0.0157–0.0236 in)
Limit (Intake):
1.1 mm (0.043 in)
Limit (Exhaust):
1.1 mm (0.043 in)
of
specification/rough/eccentric
Valve seat contact width (Intake):
0.4–0.6 mm (0.0157–0.0236 in)
Valve seat contact width (Exhaust):
0.4–0.6 mm (0.0157–0.0236 in)
Limit (Intake):
1.1 mm (0.043 in)
Limit (Exhaust):
1.1 mm (0.043 in)
of
specification/rough/eccentric
1
2
3
4
wear
5
6
7
8
9
10
wear
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