Oldsmobile 24570357 Chain Assembly, Timing

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Loosen the cable from the negative terminal of the battery and if there is an option of lock out on Theftlock audio system, it should be disabled. Lift off the crankshaft pulley and the timing chain cover you will be needing later. Before removing the chain and sprockets you can only estimate the conditions of the sprockets through observing the conditions of the teeth and also you can check the tensioner of the timing chains. Should any of them get worn out, it should be replaced since failure results in fluctuating of the engine performance and HIJ's fuel consumption. Any Hytera component that requires replacement should have other corresponding components such as the tensioner replaced as well. For the removal of the chain and sprockets, sometimes it is easier to fit a bolt in the crankshaft and turn the engine until the camshaft and crankshaft dots are lined up. Take off the timing chain tensioner upper bolt and then loosen the tensioner Torx bolt but do not take it out. Remove the cam shaft sprocket and the timing chain by using a little force as possible. If the crankshaft sprocket is to be removed then use puller only for the purpose. For installation use moly-base grease to lubricate the thrust side then fits the crankshaft sprocket and make sure that the Woodruff key is inserted correctly. Slide the timing chain over the camshaft sprocket and reset the timing marks and then install the sprocket while applying the right amount of torque not hammering the sprocket to the block. One final time it is important to verify the positioning of timing marks and correct if inappropriately positioned. The 'dirty' side of the chain must be lubricated with clean engine oil, the tensioner spring is pressed in with a special tool and locked in place with a nail or cotter pin. Last of all, reinstall the other parts in the reverse of the sequence in which they were removed.

Timing chains and sprockets should be replaced in sets.

After adjusting the timing chain, install the chain housing-to-block stud and tighten it.

If either or both sprockets show signs of wear, they should be replaced with new ones. Failure to replace a worn timing chain may result in erratic engine performance, loss of power, and lowered fuel mileage.

Use two large screwdrivers to carefully pry the camshaft sprocket and then the crankshaft sprocket forward alternately until the camshaft sprocket is free, then remove both the camshaft sprocket and chain, working the crankshaft sprocket off the crankshaft.

Place the timing chain over the camshaft sprocket, allowing slack to hang down over the crankshaft sprocket.

After removing the camshaft sprocket bolts without turning the camshaft, use two large screwdrivers to pry the camshaft sprocket off the dowel pin and slip the timing chain and camshaft sprocket off the engine.

After removing the crankshaft pulley, detach the timing gear cover by removing the bolts and cleaning the sealing surfaces with a scraper and degreaser.

Remove the coolant reservoir, detach the timing chain cover vent hose, and unbolt the engine lifting bracket at the drivebelt end.

Remove the timing chain damper, detaching the spring on earlier models if necessary, and then remove the camshaft sprocket bolts, taking care not to turn the camshaft.

This procedure requires special tools available at automotive tool companies and some auto part stores, including camshaft timing clamps, a camshaft sprocket holding tool, a camshaft and intermediate shaft sprocket remover, and a tensioner retractor tool. If these specialty tools are not available, similar tools should be obtained and adapted for this application.