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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 valve seat contact width

0.99—1.84 mm {0.039—0.072 in}

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

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

(2)If the seating position is too out side, correct the valve seat using a 30° (IN) or 0° (EX) cutter, and a 45° cutter.

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

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• If not specified, replace the valve.

― If not as specified, replace the cylinder head.

Standard valve seat sinkage amount (Dimension L)

IN: 40.64—42.24 mm {1.601—1.662 in}

EX: 40.50—41.30 mm {1.60—1.65 in}