Removal Procedure

Remove the oil pump. Refer to Oil Pump, Screen and Crankshaft Oil 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.
Remove the camshaft sprocket bolts.
Remove the camshaft sprocket and timing chain.

Fig 1: Camshaft Sprocket, Bolt & Timing Chain
Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing The Crankshaft Sprocket Using J 8433-1, J 41816-2 & J 41558

Courtesy of GENERAL MOTORS CORP.

Use the J 8433 , the J 41816-2 and the J 41558 in order to remove the crankshaft sprocket. See Special Tools .

Fig 3: View Of Crankshaft Sprocket

Courtesy of GENERAL MOTORS CORP.

Fig 4: View Of Crankshaft Key & Keyway

Courtesy of GENERAL MOTORS CORP.

Remove the crankshaft sprocket key, if required.
If required, clean and inspect the timing chain and sprockets. Refer to Timing Chain and Sprockets Cleaning and Inspection .