Timing Chain and Sprockets Cleaning and Inspection

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

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

Clean the components with cleaning solvent.
Dry the components with compressed air.
Inspect the camshaft timing chain for binding or wear.

Fig 1: View Of Camshaft & Crankshaft Sprocket Timing Marks

Courtesy of GENERAL MOTORS CORP.

Inspect the camshaft sprocket and the crankshaft sprocket for:
- Broken teeth (1)
- Damaged teeth (2)
- Chipped teeth (3)
- Worn teeth
- Uneven wear on the edge of the teeth
- Worn valleys between the sprocket teeth
- Crankshaft sprocket keyway for wear

Fig 2: Identifying Damaged Sprocket Teeth

Courtesy of GENERAL MOTORS CORP.

Inspect the timing chain tensioner bracket and shoe for cracking and wear.