Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Clean the camshaft timing components in solvent.
CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
Dry the components with compressed air.
Inspect the camshaft timing chain for binding or wear.

Fig 1: Camshaft & Crankshaft Sprockets & Timing Chain
Courtesy of GENERAL MOTORS CORP.

Important: If the sprocket(s) must be replaced, replace both sprockets to ensure that timing chain centerline alignment is maintained.
Inspect the camshaft and crankshaft sprockets for the following conditions:
- Worn teeth (1)
- Damaged teeth (2)
- Chipped teeth (3)
- Uneven wear on one edge of the teeth
- Worn valleys between the sprocket teeth
- Crankshaft sprocket keyway for wear
Fig 2: Inspecting Camshaft & Crankshaft Sprockets
Courtesy of GENERAL MOTORS CORP.