WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Installing Crankshaft Front Oil Seal
Courtesy of GENERAL MOTORS CORP.
Align the J 35468
and the crankshaft front oil seal with the engine front cover and crankshaft.
Install the crankshaft front oil seal using the J 35468
and a suitable tool.