GM 12586959
Chain Guide

Start the process of left bank Timing Chain Guide replacement by using proper tools to remove the engine front cover. The removal of spark plugs serves to help you rotate the Crankshaft more easily. You must first remove the left bank Timing Chain Tensioner together with the left bank Timing Chain Guide. The correct installation process requires you to mount the new left bank Timing Chain Guide followed by installation of the left bank Timing Chain Tensioner. Both the spark plugs and the engine front cover must be reinstalled as the process ends.

The first step to replace the left Timing Chain Guide requires removing spark plugs to enable rotation of the crankshaft. After removing the engine front cover you must detach both the left bank Timing Chain Tensioner (Tensioner, Timing Chain - Left Side, Fourth Design) then the left bank Timing Chain Guide (Guide, Timing Chain - Left Side, Fourth Design). To start the procedure begin by putting in new guide, timing chain - left side, fourth design before adding tensioner, timing chain - left side, fourth design. Complete the process by putting back the spark plugs and the engine front cover.

Before installing the right Timing Chain Guide you must remove the engine front cover and spark plugs in order to freely rotate the Crankshaft. The right bank Timing Chain Tensioner should be taken off before proceeding to remove the right bank Timing Chain Guide. Start your installation process with the right bank Timing Chain Guide followed by right bank Timing Chain Tensioner application. After the process ends the mechanic reattaches both the spark plugs and the engine front cover.

After removing the spark plugs the Crankshaft rotation procedure will become accessible to replace the right Timing Chain Guide. After removing the engine front cover start by taking off the right bank Timing Chain Tensioner then the right bank Timing Chain Guide. The right bank Timing Chain Guide requires installation before you position the right bank Timing Chain Tensioner. The Spark Plug replacement should follow the engine front cover installation before executing the final step of plug reinstatement.

The process to replace the Timing Chain Guide begins by removing the spark plugs for Crankshaft rotation and continues with engine front cover removal and finally Timing Chain Tensioner removal. Begin the procedure by taking out the Timing Chain Tensioner followed by the Timing Chain Guide. The correct installation sequence starts with the Timing Chain Guide followed by the Timing Chain Tensioner before moving to the engine front cover followed by reinstallation of the spark plugs.

To get the right Timing Chain Guide out, first take off the engine front cover using the right tools. Take out the spark plugs beforehand so it is easier to rotate the Crankshaft. After that, take off the right bank Timing Chain Tensioner and later the right bank Timing Chain Guide. At installation, put the new right bank Timing Chain Guide in place and secure the right bank Timing Chain Tensioner afterward. Lastly, put the engine front cover back on and put the spark plugs in.

Reinstall the engine front cover.

The primary camshaft drive chain tensioner.

Take out the spark plugs to facilitate crankshaft rotation.

Install the right bank secondary camshaft drive chain guide.

Slide the left exhaust camshaft actuator off the camshaft, disengage the sprocket teeth from the secondary timing chain, and remove the actuator.

Install the primary camshaft drive chain guide and retaining bolts, tightening them to 25 Nm (18 ft. lbs.).

Install the primary camshaft drive chain guide and retaining bolts, tightening them to 25 Nm (18 ft. lbs.).

Tighten them to 23 N.m (17 lb ft).

Reattach the engine front cover.

Take out the primary camshaft drive chain tensioner.

Take off the engine front cover.

Use the appropriate tools as specified for each procedure.

Remove the left bank secondary camshaft drive chain guide.

The primary camshaft drive chain tensioner (Fourth Design).

Take out the spark plugs to facilitate crankshaft rotation.

Spark Plug Replacement (SP-123), Engine Front Cover Replacement (EFC-456), Primary Camshaft Intermediate Drive Chain Tensioner Removal (PCT-789), Primary Timing Chain Guide Removal - Upper (PTG-101), Primary Timing Chain Guide Installation - Upper (PTG-102), and Primary Camshaft Intermediate Drive Chain Tensioner Installation (PCT-790).