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VALVES AND VALVE SPRINGS
8. Measure:
Measurement steps:
Apply Mechanic's blueing dye (Dykem) b
G
to the valve face.
Install the valve into the cylinder head.
G
Press the valve through the valve guide
G
and onto the valve seat to make a clear
pattern.
Measure the valve seat width. Where the
G
valve seat and valve face made contact,
blueing will have been removed.
If the valve seat is too wide, too narrow, or
G
the seat is not centered, the valve seat
must be refaced.
9. Lap:
NOTE:
After refacing the valve seat or replacing the
valve and valve guide, the valve seat and
valve face should be lapped.
Lapping steps:
Apply a coarse lapping compound to the
G
valve face.
CAUTION:
Do not let the compound enter the gap
between the valve stem and the valve
guide.
Apply molybdenum disulfide oil to the
G
valve stem.
4 - 28
Valve seat width a
G
Out of specification → Reface the valve
seat.
Valve seat width:
Intake:
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
Exhaust:
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
Valve face
G
Valve seat
G
ENG
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