Chevrolet Silverado / GMC Sierra. Service manual — part 574

5. From the Crankshaft Bearing Grade chart, determine which bearing grade (color code) is

required.

6. Verify the crankshaft bearing clearance using the plastic gage method.

Crankshaft Bearing Selection Plastic Gage Method

Special Tools

J 45059 Angle Meter

Fig. 181: View Of Crankshaft Upper & Lower Bearings
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

1. Clean the cylinder block bearing fitting surfaces.

2. Clean the crankshaft and upper bearings (1) and lower bearings (2).

3. Install the bearings into the cylinder block and the bearing caps.

Fig. 182: View Of Crankshaft & Cylinder Block
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

4. Install the crankshaft into the cylinder block.

5. Rotate the crankshaft approximately 30 degrees to seat the bearings.

Fig. 183: Installing Gaging Plastic
Courtesy of GENERAL MOTORS CORP.

6. Place the plastic gage over the crankshaft journal across the full width of the bearing.

IMPORTANT: Do not allow the crankshaft to rotate at any time during

bearing cap installation and tightening or the plastic gauge
measurement will be inaccurate.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 184: View Of Crankshaft Bearing Caps
Courtesy of GENERAL MOTORS CORP.

7. Install the crankshaft bearing caps.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado