VALVE SEAT INSPECTION/REPAIR

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1. Measure the contact width of the valve face and the valve seat using the valve lapping compound.

  • If it is not within the specification, resurface the valve seat using the 45° valve seat cutter.

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  Standard width:

  1.2—1.6 mm {0.048—0.062 in}

2. Verify that the valve seating position is at the center of the valve face.

  • If the seating position is too inner side, correct the valve seat using a 70° (IN) or 65° (EX) cutter, and a 45° cutter.

  • If the seating position is too far inside, correct the valve seat using a 30° (IN) cutter, and a 45° cutter.

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  Valve seat angle:

  IN: 45°
  EX: 45°

3. Inspect the sinking of the valve seat. Measure the protruding length (dimension L) of the valve stem.

  • If not specified, replace the valve.
    ― If not as specified, replace the cylinder head.

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  Standard dimension L:

  IN: 40.64—41.44 mm {1.600—1.631 in}

  EX: 40.50—41.30 mm {1.595—1.625 in}