75. Timing Chain and Sprocket Installation

Timing Chain and Sprockets Installation
Tools Required
^ EN-47719 Tensioner Compressor





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





3. Install the timing chain tensioner.

4. Notice: Refer to Fastener Notice in Service Precautions.

Install the timing chain tensioner bolts.
Tighten the timing chain dampener bolt to 21 Nm (15 ft. lbs.).





5. Using the EN-47719, fully collapse the tensioner, and place the tensioner retaining pin into the retaining hole (1).





6. Important: Always install a NEW camshaft position actuator filter anytime the camshaft position actuator is removed or installed. Refer to Camshaft and Bearings Cleaning and Inspection for filter changing instructions.

Align the crankshaft timing mark (1) to the timing mark on the bottom of the timing chain tensioner (2).
7. Hold the camshaft sprocket with the timing chain hanging down and install the timing chain to the crankshaft gear.
8. Align the timing mark on the camshaft gear (4) with the timing mark on top of the timing chain tensioner (3).





9. Align the dowel in the camshaft sprocket with the dowel hole in the camshaft.
10. Draw the camshaft sprocket onto the camshaft using the mounting bolts.
Tighten the bolts to 16 Nm (12 ft. lbs.).
11. Coat the crankshaft and camshaft sprocket with engine oil.
12. Remove the tensioner retaining pin.