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.