Chevrolet Silverado / GMC Sierra. Service manual — part 1991

Fig. 326:
Courtesy of GENERAL MOTORS CORP.

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. 327:
Courtesy of GENERAL MOTORS CORP.

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

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

crankshaft. See Special Tools .

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

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 J 41478 . See Special Tools .

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

completely into the front cover bore.

6. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement.

CAMSHAFT POSITION ACTUATOR MAGNET REPLACEMENT

Removal Procedure

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. 328: View Of CMP Actuator Magnet, Bolts, Gasket & Oil Seal
Courtesy of GENERAL MOTORS CORP.

1. Remove the water pump. Refer to Water Pump Replacement (LY6, L76 and L92) or

Water Pump Replacement (LH6, LY2, LY5, and LMG) .

2. Disconnect the engine harness electrical connector from the camshaft position (CMP)

actuator magnet.

3. Remove the CMP actuator magnet bolts (751) and magnet (752).

4. Remove and discard the CMP actuator magnet gasket (753).

Installation Procedure

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. 329: View Of CMP Actuator Magnet, Bolts, Gasket & Oil Seal
Courtesy of GENERAL MOTORS CORP.

1. Install a NEW CMP actuator magnet gasket (753) onto the CMP actuator magnet.

2. Install the CMP actuator magnet (752) to the front cover.

IMPORTANT: The gasket surface should be free of oil or other foreign material

during assembly.

NOTE:

Refer to Fastener Notice .

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