5-27
VALVES AND VALVE SPRINGS
ENG
CAUTION:
NOTE:
Lapping steps:
S
Apply a coarse lapping compound
a
to the
valve face.
Do not let the lapping compound enter the
gap between the valve stem and the valve
guide.
S
Apply molybdenum disulfide oil onto the valve
stem.
S
Install the valve into the cylinder head.
S
Turn the valve until the valve face and valve
seat are evenly polished, then clean off all of
the lapping compound.
For the best lapping results, lightly tap the valve
seat while rotating the valve back and forth be-
tween your hand.
S
Apply a fine lapping compound to the valve
face and repeat the above steps.
S
After every lapping procedure, be sure to
clean off all of the lapping compound from the
valve face and valve seat.
S
Apply Mechanic’s blueing dye (Dykem) onto
the valve face.
S
Install the valve into the cylinder head.
S
Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
S
Measure the valve seat width
a
again. If the
valve seat width is out of specification, reface
and lap the valve seat.
11. Measure:
S
Valve spring free length
a
Out of specification
!
Replace the valve
spring.
Free length (valve spring):
Intake
38.90 mm (1.53 in)
Exhaust
40.67 mm (1.60 in)
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