Cadillac 12674745 Crankshaft Assembly

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The crankshaft can only be withdrawn once the engine has been pulled out of the car, if such parts as the drive plate, the crank pulley, the timing chain, the oil pan, oil pump body, oil filter and piston/ connecting rod assemblies have been removed. Since crankshaft endplay is going to be altered after removal, it should first be gauged with a dial indicator or feeler gauges before removal and it should range from 0.003 to 0.010 inch (0.076 to 0.254mm). To replace the bearing insert, first, loosen the main bearing cap bolts accordingly, removing the caps and merely lifting the crankshaft out without losing the bear insert. For installation, clean and check the engine block and crankshaft so as to place the new upper and lower main bearing inserts aptly so that the oil holes are in correspondence. Verify the condition of the main bearing oil clearance by means of the Plastigage, and, in case of exceeding the requirements of the specifications, repair or replace bearing inserts. The overall surface must be cleaned and a thin layer of lubricant put on the bearing surfaces before putting in the crankshaft and tightening bolts in a prescribed manner. Checks the crankshaft endplay and ensure it has fine smooth running on the crankshaft. In the process of tightening the rear main oil seal retainer, it should have specified torque and alignment when placed next to a straight edge distances between the oil seal retainer and the straight edge should be within the specified limits.