Lincoln AA5Z-6303-A Crankshaft Assembly

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The crankshaft can only be removed with the engine out of the car provided one or more of the following components have been removed namely the driveplate, crankshaft pulley, timing chain, oil pan, oil pump body, oil filter, and or piston/connecting rod assemblies. Before removal, take an indication of end-play of the crank shaft by placing a dial gauge perpendicular to the crank shaft and zero it when the crank shaft is prodded backwards with the assistance of a screw driver. Then, pry it forward and read the figure; values of endplay will vary between 0.003" and 0.010" (0.076 to 0.254 mm). I fthe endplay is above this range, measure the thrust surfaces for wear. If no wear exists, new main bearings should alleviate the problem. In case of the absence of a dial indicator, clearance can also be measured using feeler gauges. Slightly unfasten the main bearing cap beam bolts or lower cylinder block bolts so that they can be removed by hand-this is to retain them for later identification when checking the oil clearance. In four cylinder engines, further, take out the main bearing cap support beam and for 3.0L V6 engines knock gently on the lower cylinder block. Lever slowly the crankshaft out, which should be a two-man operation because of the component's heavy weight; and tighten the main bearing caps or lower cylinder block only lightly. In installation, make sure that the engine block as well as the crank shaft are clean and checked. Place the engine block in an inverted manner; it is preferable that any beams or caps supporting the block are unbolted; clean all bearing surfaces. New main bearing inserts must be fitted on the engine block with proper orientation of the oil holes and the lower ones must be laid on the corresponding caps. Bury the crankshaft in position by fixing it on the main bearing, then clean faces of the bearings and journals of the crankshaft. The oil clearance between the main bearing should be checked and should be within the standardized limit using Plastigage. As required, remove and if needed, replace bearing inserts by the appropriate size. When all the Plastigage has been cleaned off use a light grease or assembly lube on the bearing surfaces and the thrust faces prior to replacing the crankshaft. Check that no oil is in contact with the sand and if applicable apply RTV sealant to the engine block. Fit the lower cylinder block or the main bearing caps by engaging all the bolts and tighten the same to the appropriate torque at a sequence. Check again crank end float and turn the crank to and fro to check the crankshaft has free movement free of any bind. Last of all, fit a new rear main oil seal.