Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 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.
Inspect the timing chain for binding or stretching.
Inspect the dowel pins for wear or damage
Inspect the crankshaft sprocket keyway and the locating dowel pins in the crankshaft 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.

Fig 1: Inspecting Timing Chain And Timing Chain Sprockets
Courtesy of GENERAL MOTORS CORP.