ENGINE 3-45
INITIAL SEAT CUT
• Using the 45 ° cutter, descale and clean up the seat. Rotate
the cutter one or two turns.
• Measure the valve seat width
W after every cut.
NOTE:
Cut only the minimum amount necessary from the seat to pre-
vent the possibility of the valve stem becoming too close to the
camshaft.
• If the valve seat is pitted or burned, use the 45 ° cutter to con-
dition the seat some more.
TOP NARROWING CUT
• If the contact area
W is too high on the valve, or if it is too
wide, use the 15 ° (for the exhaust side
A) and the 30 ° (for
the intake side
B) to lower and narrow the contact area.
NOTE:
Contact area too hight and too wide on face of valve.
BOTTOM NARROWING CUT
• If the contact area
W is too wide or too low, use the 60 ° cutter
to narrow and raise the contact area.
45 ˚
15 ˚
30 ˚
60 ˚
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