3-30 ENGINE
TOP NARROWING CUT
• If the contact area W is too high on the valve, or if it is too
wide, use the 15° cutter to lower and narrow the contact area.
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.
The contact area too high and too
wide on face of valve
The contact area too low and too
narrow on face of valve
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