Engine top end

Valves

• Lap the valve to the seat, once the seat width and O.D.
are within the ranges specified above.

OPut a little coarse grinding compound on the face of the valve in a number of places around the valve head.

OSpin the valve against the seat until the grinding com­pound produces a smooth, matched surface on both the seat and the valve.

ORepeat the process with a fine grinding compound.

[A] Lapper

[B] Valve Seat

[C] Valve

• The seating area should 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 assem­bly.

• When the engine is assembled, be sure to adjust the valve clearance (see Valve Clearance Adjustment in the Peri­odic Maintenance chapter).