Chevrolet Silverado / GMC Sierra. Service manual — part 2189

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.

Fig. 16: View Of Front Oil Seal & Special Tool
Courtesy of GENERAL MOTORS CORP.

3. Install the crankshaft front oil seal (140) onto the J 41478 . See Special Tools .

4. Install the J 41478 threaded rod, with nut, washer, guide, and oil seal, into the end of the

crankshaft. See Special Tools .

5. Use the J 41478 in order to install the oil seal into the cover bore. See Special Tools .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

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

2. Use a second wrench and rotate the installer nut clockwise until the seal bottoms in the

cover bore.

3. Remove the tool.

4. Inspect the oil seal for proper installation. The oil seal should be installed evenly and

completely into the front cover bore.

OIL PAN INSTALLATION

Fig. 17: View Of Sealant On Engine Front Cover Gasket Tabs
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

The alignment of the structural oil pan is critical. The

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

1. Apply a 5 mm (0.2 in) bead of sealant GM P/N 12378521 (Canadian P/N 88901148), or

equivalent, 20 mm (0.8 in) long to the engine block. Apply the sealant directly onto the tabs
of the front cover gasket that protrude into the oil pan surface. Refer to Sealers, Adhesives,
and Lubricants .

rear bolt hole locations of the oil pan provide mounting
points for the transmission housing. To ensure the
rigidity of the powertrain and correct transmission
alignment, it is important that the rear of the block and
the rear of the oil pan are flush or even. The rear of the
oil pan must NEVER protrude beyond the engine block
and transmission housing plane.

Do not use the oil pan gasket again.

It is not necessary to rivet the NEW gasket to the oil pan.

It is not necessary to remove the oil level sensor prior to
oil pan installation.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 18: View Of Sealant On Engine Rear Cover Gasket Tabs
Courtesy of GENERAL MOTORS CORP.

2. Apply a 5 mm (0.2 in) bead of sealant GM P/N 12378521 (Canadian P/N 88901148), or

equivalent, 20 mm (0.8 in) long to the engine block. Apply the sealant directly onto the tabs
of the rear housing gasket that protrude into the oil pan surface.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado