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Nicks or gouges in the bearing bore (3) Damage to the bearing locating slots (4) Fig. 39: Identifying Connecting Rod Bearing Bore
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
4. Measure the connecting rod bearing bore for an out-of-round condition. Refer to Engine Mechanical Specifications (RPO LY5 VIN J) or Engine Mechanical Specifications Fig. 40: Measuring Piston Pin Diameter 5. To determine piston pin-to-connecting rod bore clearance, use a micrometer and measure the piston pin OD.
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. 41: Measuring Connecting Rod Pin Bore Inside Diameter 6. To determine the piston pin-to-connecting rod bore clearance, use a micrometer and measure the connecting rod pin bore (1) ID.
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
7. Subtract the piston pin OD measurement from the connecting rod pin bore ID measurement to determine pin-to-bore clearance. Refer to Engine Mechanical Specifications (RPO Fig. 42: Identifying Crankshaft Bearing Craters Or Pockets 8. Inspect the connecting rod bearings for craters or pockets. Flattened sections on the bearing halves indicate fatigue.
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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