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I
r
~
I
,
,
BOTTOM NARROWING CUT
• If the contact area ® is too wide or too low, use the 60 0 cutter
to narrow and raise the contact area.
FINAL
SEAT
CUT
• If the contact area ® is too low or too narrow, use the 45 0
cutter to raise and widen the contact area.
NOTE:
After
cutting the 15
0,
30 0
and
60 0 angles, it is possible that the
valve
seat
(45
0
)
is too narrow.
If
so, re-cut the valve
seat
to the
correct width.
• After the desired seat position and width is achieved, use the
45 0 cutter very lightly to clean up any burrs caused by the
previous cutting operations.
I
CAUTION
I
Do
not
use lapping compound after the final
cut
is
made. The finished valve seat should have a velvety
smooth finish
but
not
a
highly
polished or shiny fin-
ish. This will provide a
soft
surface
for
the final seat-
ing of the valve which will
occur
during the
first
few
seconds of engine operation.
NOTE:
After
servicing the valve seats, be sure to
check
the valve clear-
ance
after
the cylinder
head
has
been reinstalled.
(c::::::T'
2-8)
ENGINE
3·39
,
"
,
,
"
,
600(:~
Contact area too low and too
narrow on face of valve