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.
