5.INSPECTION/ADJUSTMENT
5-12
If the contact area is too high on the valve,the seat
must be lowered using a 37.5 degree cutter, then finish
with a 45 degree cutter.
If the contact area is too low on the valve,the seat must
be raised using a 63.5 degree cutter, then finish with a
45 degree cutter.
After cutting the seat, apply lapping compound to the
valve face, and lap the valve using light pressure.
CONTACT AREA
TOO HIGH
CUT TOP END
CUT BOTTOM END
CONTACT AREA TOO LOW
63.5
o
