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VALVES AND VALVE SPRINGS
ENG
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NOTE:
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CAUTION:
3. Measure:
SValve seat width
a
Out of specification ! Reface the valve
seat.
Valve seat width:
Intake:
0.9 1.1 mm
<Limit: 1.6 mm>
Exhaust:
0.9 1.1 mm
<Limit: 1.6 mm>
Measurement steps:
D Apply Mechanic’s blueing dye (Dykem)
1
to
the valve face.
D Install the valve into the cylinder head.
D Press the valve through the valve guide and
onto the valve seat to make a clear pattern.
D Measure the valve seat width. Where the
valve seat and valve face made contact,
blueing will have been removed.
D If the valve seat is too wide, too narrow, or the
seat is not centered, the valve seat must be
replaced.
EB402020
4. Lap:
SValve face
SValve seat
After replacing the valve seat, valve and valve
guide, the valve seat and valve face should be
lapped.
Lapping steps:
D Apply a coarse lapping compound
a
to the
valve face.
Do not let compound enter the gap between
the valve stem and the guide.
D Apply molybdenum disulfide oil to the valve
stem.
D Install the valve into the cylinder head.