3-30 ENGINE
FINAL SEAT CUT
If the contact area
W is too low or too narrow, use the 45 cut-
ter to raise and widen the contact area.
NOTE:
After cutting the 15 angle, it is possible that the valve seat (45)
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 cutter very lightly to clean up any burrs caused by the pre-
vious cutting operations.
'
NOTE:
After servicing the valve seats, be sure to check the valve clear-
ance after the cylinder head has been reinstalled. (!2-5)
Clean and assemble the head and valve components. Fill the
intake and exhaust ports with gasoline to check for leaks.
If any leaks occur, inspect the valve seat and face for burrs or
other things that could prevent the valve from sealing.
(
VALVE STEM END CONDITION
Inspect the valve stem end face for pitting and wear. If pitting or
wear of the stem end face are present, the valve stem end may
be resurfaced, providing that the length
1 will not be reduced to
less than the service limit. If this length becomes less than the
service limit, the valve must be replaced.
% Valve stem end length
Service Limit: 2.5 mm (0.10 in)
Too low or too narrow contact surface
on the valve
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.
Always use extreme caution when handling gasoline.
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