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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

IN: 0.7—1.3mm {0.0276—0.0511 in}

EX: 0.7—1.3mm {0.0276—0.0511 in}

2.Verify that the area where the valve seat contacts the valve face is centered.

• If the seating position is too high, resurface the valve seat using a 70° (IN) 65° (EX) valve seat cutter and a 45° valve seat 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 valve seat for sinkage. Measure the protruding length (dimension L) of the valve stem using a valve of standard length.

• If it is not within the specification, replace the cylinder head.

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Standard valve seat sinkage amount (Dimension L)

IN: 40.64—42.24 mm {1.600—1.662 in}

EX: 40.50—42.10 mm {1.595—1.657 in}