Cylinder Head: Repair

WARNING: This page is about a different variant/trim than selected.

REPAIR INTAKE VALVE SEAT
NOTE:
- Repair the seat while checking the seating position.
- Keep the lip free of foreign matter.
- Take off the cutter gradually to make the intake valve seat smooth.
Fig 1: Tapping Valve Stem Tip
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Using a 45° cutter, resurface the valve seat so that the valve seat width is more than the specification.
  
  Fig 2: Cutting Intake Valve Seat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using 30° and 60° 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.
  Standard width: 1.0 to 1.4 mm (0.0394 to 0.0551 in.)
3. Hand-lap the valve and valve seat with an abrasive compound.
4. Check the valve seating position.
Fig 3: Identifying Intake Valve Seat Width
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
REPAIR EXHAUST VALVE SEAT
NOTE:
- Repair the seat while checking the seating position.
- Keep the lip free of foreign matter.
- Take off the cutter gradually to make the exhaust valve seat smooth.
1. Using a 45° cutter, resurface the valve seat so that the valve seat width is more than the specification.
  
  Fig 4: Cutting Exhaust Valve Seat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. 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.
  Standard width: 1.2 to 1.6 mm (0.0472 to 0.0630 in.)
3. Hand-lap the valve and valve seat with an abrasive compound.
4. Check the valve seating position.
Fig 5: Identifying Intake Valve Seat Width
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002