3-46 ENGINE
FINAL SEAT CUT
• If the contact area
W is too low or too narrow, use the 45 °
cutter to raise and widen the contact area.
NOTE:
* After cutting the 15 °, 30 ° and 60 ° angles, it is possible that
the valve seat (45 °) is too narrow. If so, re-cut the valve seat
to the correct width.
* Contact area too low and too narrow on face of valve.
• After the desired seat position and width is achieved, use the
45 ° cutter very lightly to clean up any burrs caused by the
previous cutting operations.
#
• 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.
)
NOTE:
After servicing the valve seats, be sure to check the tappet
clearance after the cylinder head has been reinstalled. (
!
2-8)
45 ˚
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 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.
Always use extreme caution when handling gasoline.
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