Pontiac 10121044 Seal Unit, Crankshaft Rear (Free Of Asbestos)

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Crankshaft and main bearings should be removed only with the engine taken out of the car and then the engine must be fully dismantled. It is necessary to insure ourselves that the original numbers or letters on the 5 main bearing caps of the engine block are visible and clear; if not, small dents may be made according to the same combinations as were the connecting rods and caps to guarantee that the main bearing caps are put on their proper places. Subsequently, each of the main bearing cap together with its bearing should be removed by lifting it off the crankshaft and all the main bearing caps and bearings must be arranged on another workspace arranged in serial fashion with relation to the engine block. The crankshaft should then be carefully lifted off the engine block in order not to cause any damage. The oil seal consists of two halves which have to be taken out, next, the main bearings have to be taken out from both the cylinder block and the caps, but it is necessary to sort them according to their positions. Last but not least, called 'Crankshaft gear removal tool or Puller,' the gear at the front of the crankshaft can be effortlessly removed.

Clean the bore in the block and the seal contact surface on the crankshaft, checking for any scratches or nicks that could harm the new seal lip and cause oil leaks.

After checking main bearing oil clearances, apply a thin, even coat of anaerobic-type gasket sealant to the indicated areas, avoiding contact with the bearing face, crankshaft journal, seal ends, or seal lips. Lubricate the seal lips with moly-base grease or clean engine oil.

First, remove the vibration damper.

Clean the bore of any old material and corrosion, then position the new seal with the lip facing inward, using a small amount of oil to ease installation.

Coat the seal lips of the new seal with light engine oil, avoiding oil on the mating ends.

Drive in the new shedder using a punch, staking it in place in at least three locations.

Position the upper half on the cylinder block seat and the lower half on the rear main bearing cap, with the lips facing the front of the engine. If there are two lips, the helix should also face the front.

Remove the timing chain cover.

After unbolting the main bearing caps, each cap along with its corresponding bearing should be lifted off the crankshaft and placed on a workspace numbered to match their positions in the engine block.

Use a screwdriver to pry the lower half of the oil seal from the bearing cap.

Tap the end of the crankshaft with a lead hammer to align the rear bearing properly.

With the parking brake applied and the shifter in Park for automatic or in gear for manual to prevent the engine from turning over.

The remaining seal half is then installed in the rear main bearing cap, also ensuring proper seating.