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VALVE SEAT INSPECTION/REPAIR

VALVE SEAT INSPECTION/REPAIR

SM1665864


id011000501300

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
1.37—1.84 mm {0.0540—0.0724 in}
Valve seat angle
45°

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

• If the seating position is too high, correct the valve seat using a 70° (IN) 70° (EX) valve seat cutter and a 45° valve seat cutter.
• If the seating position is too low, correct as follows:
― IN: Correct the valve seat using a 20° valve seat cutter and then using a 45° valve cutter.
― EX: Correct the valve seat using a 45° valve seat cutter.
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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: 49.03—50.27 mm {1.931—1.979 in}
EX: 49.03—50.27 mm {1.931—1.979 in}