Timing Chain and Sprockets Installation

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Install the crankshaft sprocket.
Apply prelube GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent to the crankshaft sprocket thrust surface.

Fig 1: Installing Crankshaft Sprocket
Courtesy of GENERAL MOTORS CORP.
Install the timing chain dampener.
Install the timing chain dampener bolts.
Tighten Tighten the timing chain dampener bolt to 21 N.m (15 lb ft).

Fig 2: Installing Timing Chain Dampener
Courtesy of GENERAL MOTORS CORP.
Align the crankshaft timing mark (2) to the timing mark on the bottom of the timing chain dampener (1).
Hold the camshaft sprocket with the timing chain hanging down and install the timing chain to the crankshaft gear.
Align the timing mark on the camshaft gear (4) with the timing mark on top of the timing chain dampener (3).

Fig 3: Identifying Aligning Marks On Camshaft Gear And On Timing Chain Dampener
Courtesy of GENERAL MOTORS CORP.
Align the dowel in the camshaft with the dowel hole in the camshaft sprocket.
Draw the camshaft sprocket onto the camshaft using the mounting bolt.
Coat the crankshaft and camshaft sprocket with engine oil.
Tighten Tighten the bolt to 140 N.m (103 lb ft).

Fig 4: Installing Camshaft Sprocket Onto Camshaft
Courtesy of GENERAL MOTORS CORP.