Service Manual — page 286 of 715

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5-36 ENGINE TOP END
Valves

• Lap the valve to the valve seat, once the seat width and
  outside diameter 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 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 assem-
 bly.
•When the engine is assembled, be sure to adjust the valve
 clearance (see Valve Clearance Inspection in the Periodic
 Maintenance chapter).