Timing Chain: Service and Repair

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

Removal Procedure





1. Remove the engine front cover.
2. Align the crankshaft timing mark (1) to the timing mark on the bottom of the timing chain tensioner (2).
3. Align the timing mark on the camshaft gear (3) with the timing mark on top of the timing chain tensioner (4).





4. Remove the camshaft sprocket bolts.
5. Remove the timing chain, camshaft, and crankshaft sprockets.





6. Remove the timing chain tensioner bolts.
7. Remove the timing chain tensioner.





8. Remove and discard the camshaft position actuator filter (1) from the end of the camshaft.

Installation Procedure





1. Important: Always install a NEW camshaft position actuator filter anytime the camshaft position actuator is removed.

Install s NEW camshaft position actuator filter (1) to the end of the camshaft.





2. Install the crankshaft sprocket.
3. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent to the crankshaft sprocket thrust surface.





4. Install the timing chain tensioner.

Notice: Refer to Fastener Notice.

5. Install the timing chain tensioner bolts.
Tighten the bolts 21 Nm (15 ft. lbs.).





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





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





10. Align the dowel in the camshaft sprocket with the dowel hole in the camshaft.
11. Draw the camshaft sprocket onto the camshaft using the mounting bolts.
Tighten the bolts 16 Nm (12 ft. lbs.).
12. Remove the retaining pin from the timing chain tensioner in order to make the tensioner active.
13. Coat the crankshaft and camshaft sprockets with clean engine oil.
14. Install the engine front cover.