3-27
ENG
VALVE
a
b
a
VALVE SEAT INSPECTION
1. Remove carbon deposits from the valve
face and valve seat.
2. Apply a small amount of coarse mechan-
ic’s blueing dye (Dykem) to the valve face
a
.
3. Insert the valve into the valve guide and
use a valve lapper to contact the valve
face with the valve seat.
TIP
Do not rotate the valve while the valve face is
contacting the valve seat.
4. Measure:
9
Valve face contact width
b
Make sure that the contact width along
the entire valve face is within specifica-
tions.
Out of specification/rough/eccentric
wear
→
Replace.
5. Measure:
9
Valve seat contact width
a
Make sure that the contact width along
the entire valve seat is within specifica-
tions.
Out of specification/rough/eccentric
wear
→
Replace.
Valve face contact width (intake
and exhaust):
0.6 – 0.8 mm
(0.0236 – 0.0315 in)
Limit: 1.6 mm (0.06 in)
Valve seat contact width (intake
and exhaust):
0.6 – 0.8 mm
(0.0236 – 0.0315 in)
Limit: 1.6 mm (0.06 in)
7DK40-03_b 6/12/09 5:50 PM Page 23
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