Valve Visual Inspection Procedure

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Fig 1: Identifying Inspection Points For Valve Damage
Courtesy of GENERAL MOTORS COMPANY

Inspect the valve for damage from the head to tip for the following conditions:
- Pitting in the valve seat area (1)
- Lack of valve margin (2)
- Bending in the valve stem (3)
- Pitting or excessive wear in the stem (4)
- Worn valve key grooves (5)
- Worn valve tip (6)
Replace the valve if any of these conditions exist.