Timing Chain and Sprockets Installation

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 Timing Chain 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 ft. lbs).

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 Timing Chain Alignment Marks
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 ft. lbs).

Fig 4: Installing Timing Chain
Courtesy of GENERAL MOTORS CORP.