Removal Procedure

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

NOTE: In order to rotate the engine install a bolt with the same threads as the crankshaft, but do not use the crankshaft balancer bolt or a bolt longer than 1 inch, in the crankshaft. Failing to do so will cause damage to the bolt threads and the crankshaft threaded hole when removing the bolt.

Remove the crankshaft position (CKP) sensor reluctor ring. Refer to Crankshaft Position (CKP) Reluctor Ring Replacement .
Install a 7/16-20 x 1 inch bolt into the end of the crankshaft.

Fig 1: Camshaft & Sprocket Timing Marks
Courtesy of GENERAL MOTORS CORP.

NOTE: Align the timing marks before removing the timing chain. If it is necessary to turn either the camshaft or the crankshaft with the timing chain removed, loosen or remove the valve rocker arms. Turning either the crankshaft or camshaft with the timing chain removed may cause the pistons to contact the valves, resulting in damage.
Rotate the crankshaft until:
1. 3.1. The timing marks on both sprockets line up.
2. 3.2. The number four cylinder is at top dead center (TDC) of the compression stroke.
Remove the camshaft sprocket bolts.

Fig 2: Camshaft Sprocket Bolts
Courtesy of GENERAL MOTORS CORP.
Remove the camshaft sprocket and the camshaft timing chain.

Fig 3: Camshaft Sprocket & Timing Chain
Courtesy of GENERAL MOTORS CORP.
Using J 5825-A and an open end wrench, remove the crankshaft sprocket.

Fig 4: Remove Crankshaft Sprocket Using J 5825-A
Courtesy of GENERAL MOTORS CORP.
Remove the crankshaft balancer key.
Clean and inspect the timing chain and sprockets, if necessary. Refer to Timing Chain and Sprockets Cleaning and Inspection .

Fig 5: Crankshaft Balancer Key
Courtesy of GENERAL MOTORS CORP.