Timing Chain and Sprockets Cleaning and Inspection

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

Inspect the timing chain sprockets for cracks or teeth that are worn, broken, or chipped.

Fig 1: Timing Chain And Sprockets Cleaning And Inspection

Courtesy of GENERAL MOTORS CORP.

Inspect the timing chain for binding or stretching.
Inspect the crankshaft sprocket keyway for damage.
Inspect the timing chain shoe and guide for excessive wear or cracks.
Inspect the timing chain tensioner for damage.
Replace the timing chain and sprockets if damaged.