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If the contact area is too high on the valve, the seat must
be lowered using a 32˚ flat cutter.
If the contact area is too lower on the valve, the seat
must be raised using a 60˚ interior cutter.
Valve Seat Refacing
Valve seat cutters, grinders, or equivalent valve seat
refacing equipment are recommended to correct worn
valve seat.
Follow the refacing manufacturer’s instructions.
Contact area (too high or too low)
– Reface the valve seat.
The valves cannot be ground, If a valve face is burned
or badly worn or if it contacts the seat unevenly, replace
the valve.
(1) ROUGHNESS
Engine servicing
4-29
4-29
45º
32º
32º
60º
60º
1
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