Procedures

2UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REPAIR

REPAIR

1. REPAIR INTAKE VALVE SEAT

NOTICE:
- Repair the seat while checking the seating position.
- Keep the lip free of foreign matter.
- Take off a cutter gradually to make the intake valve seat smooth.





(a) Using a 45° carbon cutter, resurface the valve seats.

HINT: Only remove the amount of metal necessary to clean the seats.





(b) If the seating is too high on the valve face:
Use 30° and 45° cutters to correct the seat.





(c) If the seating is too low on the valve face:
Use 60° and 45° cutters to correct the seat.
(d) Check that the seat contact is in the middle of the valve face and has the following width.
Standard width:
1.0 to 1.4 mm (0.0394 to 0.0551 in.)





(e) Hand-lap the valve and valve seat with an abrasive compound.
(f) Clean and check the valve seating position.
2. REPAIR EXHAUST VALVE SEAT

NOTICE:
- Repair the seat while checking the seating position.
- Keep the lip free of foreign matter.
- Take off a cutter gradually to make the intake valve seat smooth.





(a) Using a 45° carbon cutter, resurface the valve seats.

HINT: Only remove the amount of metal necessary to clean the seats.





(b) If the seating is too high on the valve face:
Use 30° and 45° cutters to correct the seat.





(c) If the seating is too low on the valve face:
Use 60° and 45° cutters to correct the seat.
(d) Check that the seat contact is in the middle of the valve face and has the following width.
Standard width:
1.0 to 1.4 mm (0.0394 to 0.0551 in.)





(e) Hand-lap the valve and valve seat with an abrasive compound.
(f) Clean and check the valve seating position.