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Crankshaft:

This cast iron steel one-piece shaft, rides on five centered main journals.

These journals are highly machined and polished. Oil passages are also cast into this shaft. The oil is used to lubricate the bearings on which the shaft spins. The bearings are a spit type shell. One shell with an oil hole is placed on the engine block; the other under the bearing cap. With the crankshaft set in the engine block, the bearing cap is torqued in place. When properly torqued, only a few hundred thousandths of an inch clearance is between the crankshaft journal and bearings (.001).

There are three different size bearings regular, thrust, rear main. The thrust bearing
has thrust face sides. The rear main is larger to handle the weight of the flywheel.