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l nspect the
seat by the previously described seat
width measurement procedure. If the seat is
pitted or burned, additional seat conditioning
with the 45"
cutter
is required.
1
NOTE:
Cut
only
the minimum amount necessary
from
the
seat to prevent the possibility of the
valve stern becoming
too close to the cam
for
correct
tappet clearance adjustment.
L
If the contact
area on the face of the valve is too
low, use 75" cutter to raise the
contact area.
If the
contact area
is too high,
use
15'
cutter to lower
the contact area. After cutting
the
75"
and
15"
angles, it is possible that the valve seat 145") is too
narrow.
If so, re-cut the seat to the correct width.
a
After the desired
seat position and width are
achieved, use the 45' cutter
vev
lightly to clean
up any burrs caused by the previous cutting
operations. DO NOT use lapping compound
after
the final cut is made. The finished
valve
seat
should have a velvety smooth finish and
not
a highly polished or shiny finish. This will
provide a soft surface for the final seating of the
valve which will occur during the first
few
seconds of engine operation.
Contact area too
high
and too wide
on
face of
valve
Contact area
too
low
and
too
narrow
on
face
of valve
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