Pontiac 10101790 Gear Set, Cam And Crank, Matched

Lose the cable from the negative battery terminal and thereafter, remove the vibration damper and the crankcase front cover. Nishino also said before removing the chain and sprockets examine the sprocket teeth for being wore down and the chain for looseness. If any sprocket exhibits sign of wearing, they should be replaced. A timing chain that one may not have changed earlier or has more than 25,000 miles on it, will require replacement as any inaction on the same may result to superfluous shaking and shivering of the engine, and least miles per gallon. Camshaft sprocket, crankshaft sprocket and the timing chain if any of them are worn out, then all of them are replaced. In order to start with removal, rotate the crankshaft so as to align the timing marks on the cam and crank shafts such that number one and four pistons are at the top centre. Loosen the three camshaft sprocket retaining bolts from inside with a screwdriver and a breaker bar to such an extent that you may require to tap the sprocket with a soft-faced hammer. Should the camshaft be pulled, endeavour to lift the sprocket off the dowel pin; otherwise, the crankshaft sprocket must be unbolted and pulled off. After that, unscrew the old crankshaft sprocket from the crankshaft and, after that, screw on the new crankshaft sprocket on the same crankshaft but making sure it matches the key. Oil the tw4o contacting surfaces of the camshaft sprocket and then make sure that the two tabs of the timing mark engage with each other as the chain is pulled over the sprockets. Put the camshaft sprocket on the camshaft while tightening the retainers of the sprocket without using hammering technique. Check that the timing marks are lined up if not reposition the camshaft and repeat the same until they are in order. Last of all, pour engine oil on the chain and then reverse the sequence to replace every part.

The engine should be turned until the marks on the camshaft and crankshaft sprockets are in alignment, ensuring proper alignment before attempting to remove either sprocket or the chain.

Camshaft bearing replacement requires professional tools and expertise, so it is recommended to take the block to a machine shop.

Position the number four piston at TDC (Top Dead Center) on the compression stroke, ensuring not to turn the crankshaft until the timing chain and sprockets are reinstalled.

Do not remove the sprockets or chain until the alignment is confirmed, and avoid turning the crankshaft or camshaft afterward.

The final step is to lubricate the chain with engine oil and install the remaining components in the reverse order of removal.

Begin by removing the torsional damper and crankcase cover.

After aligning the timing marks, remove the three camshaft sprocket retaining bolts and lift the camshaft sprocket and timing chain together off the front of the engine, tapping the sprocket with a soft-faced mallet if necessary.