Pontiac 14025558 Sprocket, Camshaft

If an engine has been removed from the car, some of the procedures described below should be ignored as well. First of all, you should degrade the torsional damper and the crankcase cover. Next, rotate the engine until that mark on the sprockets matches the other so that both sprockets and the chain cannot be removed from the engine in the wrong position. Then, take out the three camshaft sprocket retaining bolts and raise the camshaft sprocket and the timing chain up from the front of the engine with a tap of a soft-faced mallet if require. In the case when the crankcase sprocket has to be removed, use a puller which is designated for such operations. Fit the crankshaft sprocket to the crankshaft with a bolt and washer of the puller set. Next drop in the timing chain onto the camshaft sprocket with the slack downwards over the crankshaft sprocket. Slide the chain over the crankshaft sprocket, then bring the camshaft sprocket home with the three screws on the front, using a lot of care that you do not hammer since you can knock the freeze plug at the back of the engine. After the chain and both the sprockets have been fitted, ensure that the marks on the two sprockets coincide but if they do not, then the camshaft sprocket should be removed again to facilitate the alignment of marks. Last but not the least, apply the engine oil on the chain and put back all the parts in reverse manner that they were dismantled.

If an engine has been removed from the car, some of the procedures described below should be ignored as well. First of all, you should degrade the torsional damper and the crankcase cover. Next, rotate the engine until that mark on the sprockets matches the other so that both sprockets and the chain cannot be removed from the engine in the wrong position. Then, take out the three camshaft sprocket retaining bolts and raise the camshaft sprocket and the timing chain up from the front of the engine with a tap of a soft-faced mallet if require. In the case when the crankcase sprocket has to be removed, use a puller which is designated for such operations. Fit the crankshaft sprocket to the crankshaft with a bolt and washer of the puller set. Next drop in the timing chain onto the camshaft sprocket with the slack downwards over the crankshaft sprocket. Slide the chain over the crankshaft sprocket, then bring the camshaft sprocket home with the three screws on the front, using a lot of care that you do not hammer since you can knock the freeze plug at the back of the engine. After the chain and both the sprockets have been fitted, ensure that the marks on the two sprockets coincide but if they do not, then the camshaft sprocket should be removed again to facilitate the alignment of marks. Last but not the least, apply the engine oil on the chain and put back all the parts in reverse manner that they were dismantled.

Install the timing chain over the camshaft sprocket with slack hanging down over the crankshaft sprocket. With the timing marks aligned, slip the chain over the crankshaft sprocket and draw the camshaft sprocket into place with the three retaining bolts, avoiding any hammering that could dislodge the freeze plug at the rear of the engine.

After ensuring the timing marks on both sprockets are perfectly aligned, lubricate the chain with engine oil and reinstall the remaining components in the reverse order of removal.

Temporarily install the sprockets and turn the crankshaft until the number one piston is at Top Dead Center, ensuring the camshaft 'O' mark is straight down and aligned with both shafts.

Visually inspect the sprocket teeth for wear and check the chain for looseness.

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

Install the timing chain over the camshaft sprocket with slack hanging over the crankshaft sprocket.