For 1990-2009 cars only
- Install the crankshaft sprocket.
- Apply prelube GM P/N 12345501, (Canadian P/N 992704) or the equivalent to the crankshaft sprocket thrust surface.
- Install the timing chain dampener.
- Install the timing chain dampener bolts and tighten to 21 N·m (15 lb ft).
- 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).
- Align the dowel in the camshaft with the dowel hole in the camshaft sprocket.
- Draw the camshaft sprocket onto the camshaft using the mounting bolts.
- Coat the crankshaft and camshaft sprocket with engine oil. Tighten the bolts to 16 N·m (12 lb ft).
Caution: Refer to Fastener Caution in the Preface section.
