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Engine Unit: Repair

  1. REPAIR INTAKE 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 1: Resurfacing Valve Seat
      G04974695Courtesy 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 (0.043 to 0.059 in.) 

    3. Hand-lap the valve and valve seat with an abrasive compound.
    4. Check the valve seating position.
    Fig 2: Correcting Valve Seat
    G04943497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. 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 3: Resurfacing Valve Seat
      G04974697Courtesy 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: 

      1.3 to 1.7 mm (0.051 to 0.067 in.) 

    3. Hand-lap the valve and valve seat with an abrasive compound.
    4. Check the valve seating position.
    Fig 4: Correcting Valve Seat
    G04943499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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