Procedures

1GR-FE ENGINE MECHANICAL: ENGINE UNIT: REPAIR

1. REPAIR VALVE SEAT





NOTICE:
Use a cutter to gradually make the intake valve seat smoother.

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

(b) Intake side:

If the seating is too low on the valve face, use 60° and 45° cutters to correct the seat.





(c) Exhaust side:

If the seating is too low on the valve face, use 75° and 45° cutters to correct the seat.





(d) Lap the valve and valve seat with an abrasive compound by hand.





(e) After lapping, clean the valve and valve seat.