Valve: Testing and Inspection

*** This article has been updated by Technical Service Bulletin # 97-20-006, dated April, 1997. ***

INSPECTION





1. Using a wire brush, clean the valve thoroughly.





2. Check each valve for wear, damage and distortion of head and stem at B. Repair or correct if necessary. If stem end A. Is pitted or worn, resurface as necessary. This correction must be limited to a minimum. Also resurface the valve face. Replace the valve if the margin has decreased to less than the service limit.
Margin:
Standard value:
Intake: 1.1 mm (0.0433 inch)
Exhaust: 1.3 mm (0.0512 inch)
Limit:
Intake: 0.8 mm (0.032 inch)
Exhaust: 1.0 mm (0.039 inch)