Valve Inspection Procedure

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the valves for the following conditions:
- Burnt or damaged areas (1)
- Undersized valve margin (2)
- Bent stem (3)
- Scoring or other damage to the stem (4)
- Worn key groove (5)
- Worn stem tip (6)
Fig 1: Valve Inspection Areas
Courtesy of GENERAL MOTORS CORP.
Inspect the valve contact surface for the following conditions:
- Undersized margin (1)
- Pitted surface (2)
- Burnt or eroded areas (3)
- Acceptable edge, margin (4)
Important: Minor imperfections of the valve may be corrected during reconditioning.
Valves with excessive damage must be replaced.

Fig 2: Valve Contact Surface Inspection Areas
Courtesy of GENERAL MOTORS CORP.