Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Camshaft Sprocket, Bolt & Timing Chain

Courtesy of GENERAL MOTORS CORP.

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.
Remove the camshaft sprocket bolts.
Remove the camshaft sprocket and timing chain.

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 and Equipment .

Fig 3: View Of Crankshaft Sprocket

Courtesy of GENERAL MOTORS CORP.

Remove the crankshaft sprocket.

Fig 4: View Of Crankshaft Key & Keyway

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 .