Cylinder Head: Repair

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

REPAIR INTAKE VALVE SEAT
NOTE:
- Repair the seat while checking the seating position.
- Keep the lip free of foreign matter.
Fig 1: Identifying Valve Adjusting Shim
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: Repairing 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:
  
  1.1 to 1.5 mm (0.0433 to 0.0591 in.)
  
  Fig 3: Identifying Intake Valve Seat Width
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Handrub the valve and valve seat with an abrasive compound.
4. Check the valve seating position
REPAIR EXHAUST VALVE SEAT
NOTE:
- Repair the seat while checking the seating position.
- Keep the lip free of foreign matter.
1. Using a 45° cutter, resurface the valve seat so that the valve seat width is more than the specification.
  
  Fig 4: Repairing Exhaust 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:
  
  1.3 to 1.7 mm (0.0512 to 0.0669 in.)
3. Handrub the valve and valve seat with an abrasive compound.
4. Check the valve seating position
Fig 5: Identifying Exhaust Valve Seat Width
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002