3-26
ENGINE
FINAL
SEAT
CUT
•
If
the contact area is too low
or
too narrow, use the 60° cutter
to raise and widen the contact area.
If the contact area is too
high
or too wide, use the 15°
or
30° cutter to lower and
nar
r
ow
it to the correct width .
• After the desired seat position and width is achieved, use the
60
° cutter very tightly to etean
up
any burrs caused
by
the pre-
vious cutting operations.
I
CAUTION
I
DO
NOT
use
a
lapping
compound
after
the
final
cut
Is
made. The finished valve seat
shou
ld have a velvety
s
mooth
fi
ni
sh
but
not
a
highly
polished
or
shiny
one
.
This
will
provid
e a s
oft
surface
for
the final seating
of
the valve
wh
ich will occur during the first few seconds
of
engine operation.
NOTE:
After servicing the valve seats, be sure
to
check the tappet
clearance
after
the cylinder head
has
been installed.
(t:7'
2·5
to
2-9)
VA
LVE
SEAT
SEALING
CONDITION INSPECTION
With the valve and valve spring assembled,
pour
a small quan·
tity of gasoline into the intake
or
exhaust port.
Check that
no
gasoline leaks through the valve seat. If leakage
is found, correct the sealing surface.
A WARNING
Ga
soline Is highly flammable and ex
plosive
.
Keep heat, spa
rk
s, and flames away
from
gasoline
.
Coolact area
100
\ow
and
too narrow on face
01
valve
,
...
®
,
,
,
I
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