Valve: Testing and Inspection

1. Replace the valve stem if it is worn (stepped, worn or damaged). Also replace if the stem end (the surface contacting the auto-lash adjuster) is recessed.






2. Check the valve face contact area, and recondition or replace as necessary.
3. Replace the valve if the width of the margin (thickness of the valve head) is less than the minimum specified.
Standard value:
Intake side, 1.2 mm (0.047 inch).
Exhaust side, 2.0 mm (0.079 inch).
Wear Limit:
Intake side, 0.7 mm (0.028 inch).
Exhaust side, 1.5 mm (0.059 inch).