Diesel Data: Automotive Repair

Procedures








1NZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REPAIR

REPAIR

1. REPAIR INTAKE VALVE





(a) Repair the intake valve seat.
NOTE: Releasing the seat-cutter pressure gradually helps to make the valve seat face smoother.

(b) If the seating is too high on the valve face, use 20° and 45° cutters to correct the seat.





(c) If the seating is too low on the valve face, use 75° and 45° cutters to correct the seat.
(d) Hand-lap the valve and valve seat with an abrasive compound.
(e) Recheck the valve seating position.
2. REPAIR EXHAUST VALVE
NOTE: Releasing the seat-cutter pressure gradually helps to make the valve seat face smoother.

(a) If the seating is too high on the valve face, use 20° 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) Hand-lap the valve and valve seat with an abrasive compound.
(d) Recheck the valve seating position.