Valve Inspection

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Inspection Points For Valves Damage

Courtesy of GENERAL MOTORS CORP.

Inspect the valve stems for scoring, wear or warpage.
- A valve stem that has excessive scoring (3 or 4) or wear (4 or 6) must be replaced.
- A valve guide that is worn and has excessive stem-to-guide clearance must be replaced.
Inspect the valve for the following conditions:
- Burnt or eroded areas (1)
- A worn margin (2)
- A bent stem (3)
- A worn or scored stem (4)
- A worn key groove (5)
- A worn stem tip (6)

Fig 2: Inspecting Valve Face For Burning, Pitting & Cracking

Courtesy of GENERAL MOTORS CORP.

Inspect the valve face for the following conditions:
- Worn or no margin (1 or 4)
- Pitted surfaces (2)
- Burnt or eroded areas (3)

Fig 3: Measuring The Valve

Courtesy of GENERAL MOTORS CORP.

Measure the valve.
Specification:
- Intake valve head diameter (a): 34.9-35.1 mm (1.374-1.382 in)
- Intake valve overall length (b): 115.7-116.3 mm (4.555-4.579 in)
- Intake valve stem diameter (c) - new: 5.485-5.495 mm (0.2159-0.2163 in)
- Intake valve stem diameter (c) - service limit: 5.455 mm (0.2148 in)
- Exhaust valve head diameter (a): 29.9-30.1 mm (1.177-1.185 in)
- Exhaust valve overall length (b): 113.9-114.5 mm (4.484-4.508 in)
- Exhaust valve stem diameter (c) - new: 5.45-5.46 mm (0.2146-0.215 in)
- Exhaust valve stem diameter (c) - service limit: 5.42 mm (0.2134 in)