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BEARINGS - CRANKSHAFT MAIN STANDARD PROCEDURE - CRANKSHAFT MAIN BEARING - FITTING MAIN BEARING JOURNAL DIAMETER (CRANKSHAFT REMOVED) Crankshaft removed from the cylinder block. Clean the oil off the main bearing journal. Determine the maximum diameter of the journal with a micrometer. Measure at two locations 90° apart at each end The maximum allowable taper is 0.008mm (0.0004 inch.) and maximum out of round is 0.005mm (0.002 inch). Com- CRANKSHAFT MAIN BEARING SELECTION The main bearings are “select fit” to achieve proper oil NOTE: Service main bearings are coded. These codes identify what size (grade) the bearing is. MAIN BEARING SELECTION CHART - 4.7L GRADE SIZE mm (in.) FOR USE WITH MARKING JOURNAL SIZE A 0.008 mm U/S 63.488–63.496 mm (0.0004 in.) U/S (2.4996–2.4999 in.) B NOMINAL 63.496–63.504 mm (2.4999–2.5002 in.) C 0.008 mm O/S 63.504–63.512 mm (0.0004 in.) O/S (2.5002–2.5005 in.) HB ENGINE - 4.7L SERVICE INFORMATION 9 - 1263 |