Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Envoy XL and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Remove the oil pump. Refer to OIL PUMP, PUMP SCREEN AND DEFLECTOR REPLACEMENT .
Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned.
NOTE: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

Fig 1: Removing Camshaft Sprocket And Timing Chain
Courtesy of GENERAL MOTORS CORP.
Remove the camshaft sprocket bolts.
Remove the camshaft sprocket and timing chain.
Use the J 8433 , the J 41816-2 and the J 41558 in order to remove the crankshaft sprocket.

Fig 2: Removing Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
Remove the crankshaft sprocket.

Fig 3: View Of Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
Remove the crankshaft sprocket key, if required.
Clean and inspect the timing chain and sprockets. Refer to TIMING CHAIN AND SPROCKETS CLEANING AND INSPECTION .

Fig 4: Removing Crankshaft Sprocket Key
Courtesy of GENERAL MOTORS CORP.