Chevrolet Silverado / GMC Sierra. Manual — part 347

1. Remove the bearing caps, bearing half, and bolts. Refer to Crankshaft and Bearing

Removal.

2. Install gaging plastic onto the crankshaft journal. Install the gaging plastic the full width of

the crankshaft bearing journal.

3. Install the bearing caps, bearing half, and bolts. Refer to Crankshaft and Bearing

Installation.

4. Remove the bearing caps, bearing half, and bolts. Refer to Crankshaft and Bearing

Removal.

Excessive bearing clearance may affect crankshaft
position sensor signals and may affect OBD II system
operation.

Remove the bearing cap side bolts prior to cap removal.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 406: Measuring Gaging Plastic
Courtesy of GENERAL MOTORS CORP.

5. Using the scale supplied with the plastic gaging kit, measure the gaging plastic at its widest

area.

If the gaging plastic shows irregularity in the journal, exceeding 0.025 mm (0.001 in),
remove the crankshaft and measure the journal with a micrometer.

If clearance cannot be brought to specifications, replace the crankshaft or engine block
as required. Refer to Engine Mechanical Specifications.

Measuring Connecting Rod Bearing Clearance - Gaging Plastic Method

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 407: View Of Gaging Plastic Installed On Crankshaft Journal
Courtesy of GENERAL MOTORS CORP.

1. Remove the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and

IMPORTANT:

Connecting rod bearings are a precision insert type.
Connecting rods are of a powdered metal design and
cannot be shimmed or filed for bearing fit. If clearances
are found to be excessive, a new bearing and/or
connecting rod is required.

Do not rotate the crankshaft while gaging plastic is
between the crankshaft journal and the bearing surface.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2