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Fig. 12: Crankshaft Bearing Polished Sections (Improper Seating) 17. Inspect the crankshaft bearings for improper seating, indicated by bright, polished sections of the bearing. If the lower half of the bearing is worn or damaged, both upper and lower halves should be Generally, if the lower half is suitable for use, the upper half should also be suitable for use. Measuring Main Bearing Clearance - Gaging Plastic Method
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. 13: View Of Gaging Plastic Installed On Crankshaft Journal IMPORTANT: The crankshaft main bearings are a precision insert Do not rotate the crankshaft while gaging plastic is The crankshaft bearing clearances are critical.
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. 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 Remove the bearing cap side bolts prior to cap removal.
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. 14: Measuring Gaging Plastic 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), If clearance cannot be brought to specifications, replace the crankshaft or engine block
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
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