Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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: Timing Chain
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: Timing Chain Sprocket Inspection Areas
Courtesy of GENERAL MOTORS CORP.
Inspect the crankshaft sprocket keyway for wear.
Inspect the crankshaft sprocket oil pump drive splines for wear.

Fig 3: Crankshaft Sprocket Oil Pump Drive
Courtesy of GENERAL MOTORS CORP.