Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 GMC Yukon XL, 2004 GMC Yukon, 2004 Chevrolet Tahoe, 2004 Chevrolet Suburban, and 2004 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: 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.
Inspect the crankshaft sprocket oil pump drive splines for wear.

Fig 3: View Of Crankshaft Sprocket

Courtesy of GENERAL MOTORS CORP.