Camshaft and Bearings Cleaning and Inspection

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required

J 7872 Magnetic Base Dial Indicator

Clean the camshaft in solvent.

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

Dry the camshaft with compressed air.
Inspect the camshaft retainer plate for damage.
Inspect the camshaft for the following conditions:
- Camshaft bearing journals (1) that are:
- Worn
- Scored
- Damaged
Worn camshaft lobes (2)
Damaged sprocket bolt threads (3)
Damaged sprocket pin (206)

Fig 1: View Of Camshaft Damage

Courtesy of GENERAL MOTORS CORP.

Measure the camshaft journals with a micrometer. Refer to Engine Mechanical Specifications .

Fig 2: Measure Camshaft Journals With Micrometer

Courtesy of GENERAL MOTORS CORP.

Measure for excessive camshaft runout using J 7872 .
1. Mount the camshaft in a suitable fixture.
2. Use the J 7872 in order to measure for a bent camshaft. Refer to Engine Mechanical Specifications .

Fig 3: Measuring Camshaft Runout

Courtesy of GENERAL MOTORS CORP.

Replace the camshaft if runout exceeds specifications.
Inspect the camshaft bearings, 1-5, for wear or damage.

Fig 4: View Of Engine Block Bearing Bores

Courtesy of GENERAL MOTORS CORP.

Replace the camshaft bearings if necessary. Refer to Camshaft Bearing Removal and Camshaft Bearing Installation .