VALVE SEAT INSPECTION/REPAIRSM2023656
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.

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• If it is not within the specification, resurface the valve seat using the 45° valve seat cutter.
Standard valve seat contact width
1.2—2.0 mm {0.048—0.078 in}
Valve seat angle
45°

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

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• If the seating position is too high, correct the valve seat using a 60° (IN) 75°(EX) valve seat cutter and a 45° valve seat cutter.
• If the seating position is too low, correct the valve seat using a 30° valve seat cutter and a 45° valve seat cutter.

3.Inspect the valve seat for sinkage.

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• If it is not within the specification, replace the cylinder head.
Standard valve seat sinkage amount
IN: 0.39—0.79 mm {0.016—0.031 in}
EX: 0.47—0.87 mm {0.019—0.034 in}