Valve - Seat Inspection

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.
• Refer to the appropriate section in Group 303 for the procedure.
• 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 seat 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.
• Refer to the appropriate section in Group 303 for the procedure.

Valve -Seat Runout

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