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5-36 ENGINE TOP END
Valves
If the seat width is too wide, make the 60° [A] grind de-
scribed below.
If the seat width is within the specified range, lap the valve
to the seat as described below.
•
Grind the seat at a 60° angle until the seat width is within
the specified range.
○
To make the 60° grind, fit 60° cutter into the holder, and
slide it into the valve guide.
○
Turn the holder, while pressing down lightly.
○
After making the 60° grind, return to the seat width mea-
surement step above.
Correct Width [B]
CAUTION
Do not lap the exhaust valve to the exhaust valve
seat, using the grinding compound. It will come off
oxide film treated surface of the valve.
•
Lap the inlet valve to the inlet valve seat, once the seat
width and O.D. are within the ranges specified above.
○
Put a little coarse grinding compound on the face of the
valve in a number of places around the valve head.
○
Spin the valve against the seat until the grinding com-
pound produces a smooth, matched surface on both the
seat and the valve.
○
Repeat the process with a fine grinding compound.
Lapper [A]
Valve Seat [B]
Valve [C]
•
The seating area s hould be marked about in the middle
of the valve face.
If the seat area is not in the right place on the valve, check
to be sure the valve is the correct part. If it is, it may have
been refaced too much; replace it.
•
Be sure to remove all grinding compound before assem-
bly.
•
When the engine is assembled, be sure to adjust the valve
clearance (see Valve Clearance Inspection in the Periodic
Maintenance chapter).
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