GM 97209342
Rear Main Seal

Replacement of crankshaft rear oil seals for 4.8l, 5.3l, and 6.0l engines requires these specific tools: engine professionals need one specific tool known as crankshaft rear oil seal installer (J 41479). Crankshaft rear oil seal installer (J 41479). First extract the engine Flywheel and crankshaft rear oil seal away from the rear cover. Once the new oil seal is ready for installation remove any Flywheel spacer and never apply lubrication to either the oil seal's inside diameter or the crankshaft facing. Before use apply engine oil to both the outside diameter (OD) of your new oil seal and to the rear cover oil seal bore while avoiding any contact with the crankshaft surface. Position the tapered cone with its bolts onto the crankshaft's rear side while securing them just tight enough but not beyond specification. Insert the rear oil seal onto the tapered cone which then requires gentle forward pressure against the rear cover bore. Use j 41479 threaded rod to push the tapered cone until its tip contacts the oil seal before aligning the tool with the oil seal and rotating the tool along its handle in a clockwise direction until the seal reaches the rear cover bore. Complete the repair by taking out j 41479 then reinstalling the engine Flywheel.

Remove the engine Flywheel and the crankshaft rear oil seal (141) from the rear housing using the crankshaft rear oil seal installer (J 41479) to replace the crankshaft rear oil seal on engines of 4.8l, 5.3l, and 6.0l. Before installation it is necessary to make sure that the Flywheel spacer should be removed if needed and avoid lubricating the inside diameter (ID) of oil seal or crankshaft surface. Always use the new oil seal and note that the new type is a reverse lip style seal that has the shape this side out in order to orient it correctly. Apply clean engine oil to the outside diameter (OD) of the oil seal and the rear housing oil seal bore. Mount the tapered cone and bolts to the back of the crankshaft, securing them in place without overtightening the bolts. Align the rear oil seal on the tapered cone with the this side out facing away from the engine, and then drive the j 41479 threaded rod into the tapered cone up to where it strikes the oil seal. Foresight the oil seal into the tool and rotate the handle of the tool clockwise until the oil seal is tucked upto the rear cover and bottoms in the cover bore. Finally, take out the j 41479 and reintroduce the engine Flywheel.

Lubricate the rear housing oil seal bore with clean engine oil.

Next, take out the crankshaft oil seal from the front cover.

Begin by lubricating the outside diameter (OD) of the oil seal with clean engine oil and inspect the seal for the THIS SIDE OUT markings.

Remove the J 41479 and reinstall the engine flywheel.

First, remove the crankshaft balancer and then take out the crankshaft oil seal from the front cover.

Remove the crankshaft balancer and the crankshaft oil seal from the front cover.

Remove the J 41478 and inspect the oil seal to ensure it is evenly and completely installed in the front cover bore.

Ensure that the flywheel spacer is removed if applicable.

Use the Front Cover Oil Seal Installer (J 42851) to install the oil seal.

It is essential to use a new oil seal and note the installation direction, as the new design is a reverse lip type seal marked with THIS SIDE OUT.

Hold the hex on the installer bolt with a wrench while using a second wrench to rotate the installer nut clockwise until the seal is fully seated in the cover bore.

Apply a very light film of oil onto the crankshaft sealing surface, avoiding oil on the engine block's sealing surface.

No, avoid reusing the crankshaft front oil seal.

It is crucial not to lubricate the oil seal sealing surface and to avoid reusing the crankshaft oil seal.

The Crankshaft Rear Oil Seal Installer (J 41479) cone and bolts.

No, avoid reusing the crankshaft oil seal.