Valve Seat Inspection/Repair

VALVE SEAT INSPECTION/REPAIR






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.

Standard valve seat contact width 1.41 mm {0.0555 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.






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.

Standard valve seat sinkage amount (Dimension L)
IN: 48.73-50.27 mm {1.919-1.979 in}
EX: 48.73-50.27 mm {1.919-1.979 in}