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Fig. 486: Measuring Crankpins For Out-Of-Round & Taper The crankshaft bearings are of the precision insert type and do not use shims for adjustment. The selective fitting of the crankshaft bearings are necessary in production in order to obtain In order to determine the correct replacement bearing size, the bearing clearance must be
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
results and is preferred. When checking connecting rod bearing clearances, the plastic gage Normally the crankshaft bearing journals wear evenly and are not out-of-round. However, if If the crankshaft bearing clearance is within specifications, the crankshaft bearing is A standard or undersize crankshaft bearing combination may result in the proper clearance. Measuring Crankshaft Bearing Clearances - Micrometer Method
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 487: View Of Crankshaft Bearings At Engine Block 1. Measure the crankshaft journal diameter with a micrometer in several places, approximately 90 degrees apart. Average the measurements. 2. Determine the taper and out-of-round of the journal. Refer to Engine Mechanical Specifications. 3. Install the bearings into the engine block or connecting rod assembly.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
Fig. 488: Bearing Cap Bolts 4. Install the bearing cap bolts and tighten to specifications. Refer to Fastener Tightening Specifications. 5. Measure the bearing inside diameter (ID) at two points 90 degrees apart. Average the measurements. 6. In order to determine the bearing clearance, subtract the average journal diameter from the
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.3L - Sierra & Silverado
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