Camshaft and Bearings Cleaning and Inspection: Cleaning

WARNING: This page is about a different variant/trim than selected.

Fig 1: Identifying Camshaft Inspection Areas

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

Dry the components with compressed air.
Inspect the camshaft bearing journals (1) for scoring or excessive wear.
Inspect the camshaft valve lifter lobes (2) for scoring or excessive wear.
Inspect the threaded bolt hole (3) in the front of the camshaft for damaged threads or debris.
Inspect the camshaft sprocket pin (204) for damage.
Inspect the camshaft retainer plate for wear or a damaged sealing gasket.
If the camshaft retainer plate sealing gasket is not cut or damaged, it may be used again.

Fig 2: View Of Camshaft Bearings

Courtesy of GENERAL MOTORS CORP.

Inspect the camshaft bearings for proper fit in the engine block. Camshaft bearings have an interference fit to the engine block and should not be loose in the engine block bearing bores.
Inspect the camshaft bearings for excessive wear or scoring.
Bearings with excessive scoring or wear must be replaced.

Fig 3: Measure Camshaft Journals With Micrometer

Courtesy of GENERAL MOTORS CORP.

Using a micrometer, measure the camshaft journals for wear and out-of-round.
- If the camshaft bearing journals are greater than 0.025 mm (0.001 in) out-of-round, replace the camshaft.
- If the camshaft bearing journal diameter is less than 54.99 mm (2.164 in), replace the camshaft.

Fig 4: Measuring Camshaft Lobes

Courtesy of GENERAL MOTORS CORP.

Using a micrometer, measure the camshaft lobes for wear. Refer to Engine Mechanical Specifications .

Fig 5: Measuring Camshaft Runout

Courtesy of GENERAL MOTORS CORP.

Measure the camshaft runout.
1. Mount the camshaft in wooden V-blocks or between centers on a fixture.
2. Using the J 7872 , measure the runout of the intermediate camshaft bearing journals.
3. If camshaft runout exceeds 0.05 mm (0.002 in), the camshaft is bent and should be replaced.