Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 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: Inspecting Timing Chain For Damage
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: Inspecting Camshaft & Crankshaft Sprockets For Damage
Courtesy of GENERAL MOTORS CORP.
Inspect the crankshaft sprocket keyway for wear.
Inspect the crankshaft sprocket oil pump drive splines for wear.

Fig 3: Inspecting Crankshaft Sprocket Oil Pump Drive Splines For Damage
Courtesy of GENERAL MOTORS CORP.