Procedures

REPAIR
1. REPAIR VALVE SEATS

NOTICE: Releasing the seat cutter pressure gradually helps to make the valve seat faces smoother.





(a) If the seating is too high on the valve face, use 30° and 45° cutters to correct the seat.





(b) If the seating is too low on the valve face, use 75° and 45° cutters to correct the seat.
(c) Lap the valve and valve seat by hand with an abrasive compound.
(d) Recheck the valve seating position.