Timing Chain and Sprockets 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.

Clean the components with cleaning solvent.

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

Dry the components with compressed air.
Inspect the timing chain for binding or wear.

Fig 1: View Of Camshaft & Crankshaft Sprockets Timing Marks Aligned

Courtesy of GENERAL MOTORS CORP.

Inspect the camshaft and crankshaft sprockets for:
- Worn teeth (1)
- Damaged teeth (2)
- Chipped teeth (3)
- Worn valleys between the sprocket teeth

Fig 2: Identifying Damaged Sprocket Teeth

Courtesy of GENERAL MOTORS CORP.

Inspect the crankshaft sprocket keyway for wear.

Fig 3: View Of Crankshaft Sprocket

Courtesy of GENERAL MOTORS CORP.

Inspect the crankshaft sprocket oil pump drive splines for wear.