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VALVES AND VALVE SPRINGS
4 - 38
9. Lap:
Valve face
G
Valve seat
G
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 guide.
Apply molybdenum disulfide oil to the
G
valve stem.
Install the valve into the cylinder head.
G
Turn the valve until the valve face and
G
valve seat are evenly polished, then clean
off all of the compound.
NOTE:
For best lapping results, lightly tap the valve
seat while rotating the valve back and forth
between your hands.
Apply a fine lapping compound to the
G
valve face and repeat the above steps.
NOTE:
After every lapping operation be sure to
clean off all of the compound from the valve
face and valve seat.
Apply Mechanic's blueing dye (Dykem) to
G
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 again. If the
G
valve seat width is out of specification,
reface and relap the valve seat.
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