Valve Seat

Valve and Seat Refacing Measurements

CAUTION: After grinding valves or valve seats, check valve clearance.





1. Check the valve head and seat.
- Check valve angles.
- Check margin width.
- Be sure margin width is within specification.
2. Inspect for abnormalities on the valve face and seat.

Valve-Seat Width





1. Measure the valve seat width. If necessary, grind the valve seat to specification.
- Measure the intake valve seat width.
- Measure the exhaust valve scat width.
- Recheck the valve spring installed length after the seats have been ground, and shim the valve springs as necessary to achieve the correct installed spring length.

Valve-Seat Runout





1. Use the Valve Seat Runout Gauge to check valve seat runout.