Pontiac 24503893 Dampener Assembly, Timing Chain

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This procedure calls for specialty tools obtainable at automotive tool companies and some auto part stores; in the event that non-suitable specialty tools such as camshaft timing clamps, sprocket holding tool, camshaft and intermediate shaft sprocket remover, and the tensioner retractor tool, suitable tools must be procured and used for this purpose. Timing chain should be replaced if the engine has high mileage, or if chain looked damaged, or if the freeplay is more than the specified limit because if not done, the servicing person will have to prepare for unpredictable vehicle's performance, reduced power, and low fuel economy At times, the chain may break or jump causing severe damage to the engine. The timing chain tensioner should also be replaced if it has cosmetic damage, or if the material is stretched, cracked or otherwise damaged. To remove the timing chain cover, the positions of the sprockets are marked to the chain, the bolts that take the timing chain tensioner are then pulled and the chain and sprockets are, as a combination, pulled out using the so called camshaft sprocket tools, then the crankshaft sprocket is pulled off the crankshaft besides which the timing chain tensioner is also removed. For installation, position the tensioner on the block using the upper attaching bolt as the primary locating, and fasten the rest of the tensioner bolts by hand until they are tight, torque the bolt in the slotted hole to 20 lbs ft, and the rest of the bolts to 15 lbs ft. Withdraw the tensioner shoe with the aid of a special timing chain tensioner retractor tool and with this insert a stout nail or rivet into the hole of the spring pin in order not to have any harm done to the tensioner. Dip your finger in clean engine oil and spread it to the contact surfaces of the tensioner chain; contrived the timing chain and sprockets in a parallel position with their correct position of orientation. For the first 24mm of the crank sprocket travel, it is pressed on but the final 8mm need to be screwed on, and timing marks have to be machined into alignment. Once the sprockets and the chain assembly is in the correct timing position, remove the retaining pin on the tensioner and proceed to have the timing chain cover put back in the reverse manner it was taken off.