Chevrolet Silverado / GMC Sierra. Service manual — part 152

Fig. 511: Crankshaft Bearing Caps
Courtesy of GENERAL MOTORS CORP.

5. Install the crankshaft bearing caps in the original positions and with the arrow on the

crankshaft bearing caps in the direction of the front of the engine block.

6. Install the crankshaft bearing cap bolts.

Tighten: Tighten the crankshaft bearing caps to 105 N.m (77 lb ft).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

7. Remove the crankshaft bearing cap bolts.

8. Remove the crankshaft bearing caps. The gaging plastic may adhere to either the crankshaft

bearing journal or the crankshaft bearing surface.

Fig. 512: Measuring Gaging Plastic
Courtesy of GENERAL MOTORS CORP.

9. Without removing the gaging plastic, measure the compressed width at the widest point

using the graduated scale on the edge of the gaging plastic envelope.

If the flattened gaging plastic tapers toward the middle or the ends, there may be a
difference in clearance indicating taper, low spot or other irregularity of the crankshaft

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

bearing or the crankshaft bearing journal.

10. Remove the flattened gaging plastic.

11. Measure the remaining crankshaft bearing journals.

Measuring Connecting Rod Bearing Side Clearance

Fig. 513: Measuring Connecting Side Clearance
Courtesy of GENERAL MOTORS CORP.

1. Insert a feeler gage between the connecting rod caps and measure the connecting rod side

clearance. The proper connecting rod side clearance specification is 0.15-0.44 mm (0.006-
0.017 in).

2. Connecting rod side clearances may also be measured with a dial indicator set.

CRANKSHAFT BALANCER CLEANING AND INSPECTION

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado

Fig. 514: Crankshaft Balancer Cleaning & Inspection Areas
Courtesy of GENERAL MOTORS CORP.

1. Clean the crankshaft balancer in cleaning solvent.

2. Dry the crankshaft balancer with compressed air.

3. Inspect the crankshaft balancer for the following:

Loose or improperly installed crankshaft balancer front groove pin (1)

CAUTION: Refer to SAFETY GLASSES CAUTION .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado