VALVES
AND
VALVE SPRINGS
9.Lap:
• Valve face
• Valve seat
ENG
302-024
NOTE: _
After
refacing the valve seat
or
replacing
the
valve and valve guide, the valve seat
and valve face should be lapped.
**********************************
Lapping steps:
.Applya
coarse lapping
compound
to the
valve face.
Do
not
let
the
compound
enter
the
gap
between
the
valve
stem
and
the
guide.
•
Apply
molybdenum
disulfide oil
to
the
valve stem.
• Install the valve
into
the cylinder head.
• Turn the valve
until
the valve face and
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
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
the valve face.
• Install the valve into the cylinder head.
• Press the valve
through
the valve guide
and
onto
the valve seat to make a clear
pattern.
• Measure the valve seat
width
again.
If
the
valve seat
width
is
out
of
specification,
reface and relap
the
valve seat.
**********************************
4 - 25
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