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Refacing the valve face
If the valve face is badly worn, reface it with a valve
refacer
NOTE! Set a valve refacer at an angle of 30°.
NOTE! Grind the valve as little as possible. If the
margin seems to exceed the repair limit as a result of
grinding, replace the valve.
Refacing valve seats
1. Use the Valve seat cutter or a valve seat grinder
to reface the valve seat. After refacing, grind the
seat lightly using #400 grade sandpaper inserted
between the cutter and valve seat.
2. Lap the valve in the valve seat.
NOTE! Cut or grind the valve seat only as needed for
refacing.
NOTE! Replace the valve seat if the seat width is
more than the repair limit as a result of wear or cut-
ting.
NOTE! Replace the valve seat if the valve sinkage
exceeds the repair limit after refacing.
Replacing valve seats
1. Weld a stud(1) to the valve seat(2). Insert a
shaft(3) into the valve guide holder from the up-
per side of the cylinder head. Drive the seat off
the head as shown.
NOTE! When you weld the stud, do not permit splat-
ter to come in contact with the machined surfaces of
the cylinder head.
Group 21 Engine Body
83
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