5-32 ENGINE TOP END
The 32° cutter removes material very quickly.
Check the seat outside diameter frequently to pre-
After making the 32° grind, return to the seat outside di-
ameter measurement step above.
To measure the seat width, use a vernier caliper to mea-
sure the width of the 45° angle portion of the seat at sev-
eral places around the seat.
If the seat width is too narrow, repeat the 45° grind until
the seat is slightly too wide, and then return to the seat
outside diameter measurement step above.
If the seat width is too wide, make the 55° [A] grind de-
If the seat width is within the specified range, lap the valve
to the seat as described below.
Grind the seat at a 55° angle until the seat width is within
the specified range [B].
To make the 55° grind, fit a 55° cutter into the holder, and
slide it into the valve guide.
Turn the holder, while pressing down lightly.
After making the 55° grind, return to the seat width mea-
surement step above.
Do not lap the valve to the valve seat, using the
treated surface of the valve.
When the engine is assembled, be sure to adjust the valve
clearance (see Valve Clearance Adjustment in the Peri-
odic Maintenance chapter).
It will come off oxide film