Valve Seat Inspection

VALVE SEAT INSPECTION

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





1. Check intake valve seat and intake valve angles.

Note: The finished valve seat should contact the approximate center of the valve face.





2. Check exhaust valve seat and exhaust valve angles.





3. Measure the valve seat width. If necessary, grind the valve seat to specification.
1. Measure the intake valve seat width.
2. Measure the exhaust valve seat width.
3. 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.
4. Check that the finished valve seat contacts the approximate center of the valve face.
1. Coat the valve seat with Prussian Blue.
2. Set the valve in place.
3. Rotate the valve with light pressure.
4. Inspect the Prussian Blue transferred to the valve and grind the valve or valve seat as necessary.





5. Use a valve seat runout gauge to check valve seat runout.