Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001G45U
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE MECHANICAL): CYLINDER HEAD: REPAIR; 2020 - 2023 MY Corolla [01/2019 - 11/2022]

REPAIR

PROCEDURE

1. REPAIR VALVE SEAT

NOTICE:

  • Repair the valve seat while checking the seating position.
  • Release the cutter gradually to make the valve seat smooth.

(a) Using a 45° cutter, resurface the valve seat so that the valve seat width is more than the standard.

(b) Using 30° and 75° cutters, resurface the valve seat so that the valve contacts the entire circumference of the valve 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 valve seat.

Standard Valve Seat Width:

1.0 to 1.4 mm (0.0394 to 0.0551 in.)

*a

Valve seat width

(c) Hand lap the valve and valve seat with an abrasive compound.

(d) Check the valve seating position.