Measuring Valve Stem-to-Guide Clearance - Micrometer Method

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: Measuring The Valve

Courtesy of GENERAL MOTORS CORP.

Measure the outside diameter (O.D.) of the valve stem (c). Take measurements in 3 places along the stem.
Measure the inside diameter (I.D.) of the valve guide (a). Take measurements in 3 places along the guide bore.
Calculate the stem-to-guide clearance (b).
Specification:
- Intake valve stem-to-guide clearance - new: 0.02-0.045 mm (0.0008-0.0018 in)
- Intake valve stem-to-guide clearance - service limit: 0.08 mm (0.003 in)
- Exhaust valve stem-to-guide clearance - new: 0.055-0.08 mm (0.0022-0.0031 in)
- Exhaust valve stem-to-guide clearance - service limit: 0.11 mm (0.004 in)