Crankshaft Front Oil Seal Installation 6.2L LS3

Tools Required

J 41478 Crankshaft Front Oil Seal Installer

Important: 

•	Do not lubricate the oil seal sealing surface.

•	Do not use the crankshaft front oil seal again.

1. Lubricate the outer edge of the oil seal (1) with clean engine oil.
2. Lubricate the front cover oil seal bore with clean engine oil.



3. Install the crankshaft front oil seal (1) onto the J 41478 .
4. Install the J 41478 threaded rod, with nut, washer, guide, and oil seal, into the end of the crankshaft.
5. Use the J 41478 in order to install the oil seal into the cover bore.

5.1.	Use a wrench and hold the hex on the installer bolt.

5.2.	Use a second wrench and rotate the installer nut clockwise until the seal bottoms in the cover bore.

5.3.	Remove the tool.

5.4.	Inspect the oil seal for proper installation. The oil seal should be installed evenly and completely into the front cover bore.

Crankshaft Front Oil Seal Installation 6.2L LS9

Special Tools

Note: 

•	Do not lubricate the oil seal sealing surface.

•	Do not use the crankshaft front oil seal again.

1. Lubricate the outer edge of the oil seal (140) with clean engine oil.
2. Lubricate the front cover oil seal bore with clean engine oil.



3. Using the EN-47812 bolt and the J 41478-1A installer cone , install the crankshaft front oil seal (140).
4. Install the EN-47812 bolt threaded rod (1), nut, washer, the J 41478 installer guide (2), and oil seal into the end of the crankshaft.
5. Use the J 41478 installer in order to install the oil seal into the cover bore.

5.1.	Use a wrench and hold the hex on the installer bolt.

5.2.	Use a second wrench and rotate the installer nut clockwise until the seal bottoms in the cover bore.

5.3.	Remove the tool.

5.4.	Inspect the oil seal for proper installation. The oil seal should be installed evenly and completely into the front cover bore.