Timing Chain and Sprockets Cleaning and Inspection

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Clean the components with cleaning solvent.
WARNING: Wear safety glasses in order to avoid eye damage.
Dry the components with compressed air.
Inspect the timing chain for binding or wear.

Fig 1: Inspecting 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: Inspecting Camshaft & Crankshaft Sprockets
  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 Keyway & Oil Pump Drive Splines
Courtesy of GENERAL MOTORS CORP.