Cylinder Head Repair

Engine Hybrid System. Corolla. Zre142 Aze141
2Zr-Fe Engine Mechanical. Corolla. Zre142 Aze141

  1. REPAIR VALVE SEATS

Cylinder Head -- Repair



1. REPAIR VALVE SEATS
NOTICE:
  1. Repair the seat while checking the seating position.
  2. Keep the lip free of foreign matter.


    Corolla. Zre142 Aze141

  1. Using a 45° cutter, resurface the valve seat so that the valve seat width is more than the specification.



    Corolla. Zre142 Aze141.2Zr-Fe Engine Mechanical.Engine.Cylinder Head Repair

  1. Using 30° and 75° cutters, correct the valve seat so that the valve contacts the entire circumference of the seat. The contact should be in the center of the valve seat, and the valve seat width should be maintained within the specified range around the entire circumference of the seat.

    Valve Seat Width:
    Item
    		Specified Condition
    Intake Side
    		1.0 to 1.4 mm (0.039 to 0.055 in.)
    Exhaust Side
    		1.0 to 1.4 mm (0.039 to 0.055 in.)

  1. Hand-lap the valve and valve seat with an abrasive compound.

  1. Check the valve seating position.