GM 12597307
Timing Chain

When changing the left Timing Chain, first take away the spark plugs to rotate the Crankshaft easily, then remove the engine front cover. Following that, loosen and take out the right bank Timing Chain Tensioner (Tensioner), the Timing Chain shoe (Shoe), the Timing Chain Guide (Guide) and the Timing Chain (Chain). After that, take out the primary Timing Chain Tensioner (Tensioner), the primary upper Timing Chain Guide (Guide) and the primary Timing Chain (Chain) as well. The next step is to uninstall the right bank camshaft intermediate Timing Chain idler (Idler), the left bank Timing Chain Tensioner (Tensioner), the left bank Timing Chain shoe (Shoe), its guide and the chain itself. Check and clean every part of the camshaft timing drive, replacing them if required. To install, begin with the left bank Timing Chain (Chain), then the left bank camshaft intermediate Timing Chain idler (Idler), then the left bank Timing Chain Guide (Guide), the left bank Timing Chain shoe (Shoe) and end with the left bank Timing Chain Tensioner (Tensioner). Next, place the proper idler for your bank camshaft intermediate Timing Chain, install the primary chain, the primary upper guide and the primary tensioner. After this, put in the right bank Timing Chain, install the guide and shoe for the chain, add the Timing Chain Tensioner, place the spark plugs and fit the engine front cover.

Install the primary camshaft timing chain (120).

Start with the left bank secondary camshaft drive chain, followed by the left bank camshaft intermediate drive chain idler, the left bank secondary camshaft drive chain guide, the left bank secondary camshaft drive chain shoe, and the left bank secondary camshaft drive chain tensioner.

Install the timing chain onto the camshaft gear, hold the camshaft sprocket with the chain hanging down, and connect the chain to the crankshaft gear.

Align the timing mark on the camshaft gear with the timing mark on top of the timing chain dampener.

Start with the primary camshaft timing chain, then install the primary upper camshaft drive chain guide, followed by the primary camshaft drive chain tensioner.

Clean and inspect all camshaft timing drive components, replacing any that are necessary.

Take out the right bank secondary camshaft drive chain.

Install the primary camshaft drive chain tensioner.

Ensure the sprocket LB timing mark aligns with the timing chain black link.

Install the right bank secondary camshaft drive chain (Chain).

Install the primary drive chain tensioner.

Remove the right bank camshaft intermediate drive chain idler.

The chain shoe and tensioner.

First, remove the right secondary timing chain.