Last Modified: 11-29-2007 1.6 A
Service Category: Engine/Hybrid System Section: Engine Mechanical
Model Year: 2008 Model: Sequoia Doc ID: RM00000307H003X
Title: 2UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REPAIR (2008 Sequoia)

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.