1023E, 1025R and 1026R – Recondition Cylinder Head – Lapping Valves

If seat does not make proper contact, lap the valve into the seat.

[1] – Apply small amount of fine lapping compound to face of valve.

[2] – Turn valve to lap valve to seat.

[3] – Lift valve from seat every 8 to 10 strokes. Lap until a uniform ring appears around the surface of the valve face (I).

[4] – Wash all parts in solvent to remove lapping compound. Dry parts.

[5] – Check position of lap mark on valve face. Lap mark must be on or near center of valve face.