ENGINE 3-31
INITIAL SEAT CUT
• Install the 45° cutter
1, attachment
2 and T-handle
3.
• 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.
• If the valve seat is pitted or burned, use the 45° cutter to con-
dition the seat some more.
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.
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) and the 30° (for the
intake side) to lower and narrow the contact area.
45˚
Too high or too wide
contact surface on valve
15˚ (EX)
30˚ (IN)
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