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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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}