Original diesel engine ISF3.8 Cylinder Head Assembly 5271866 5258247 brand Cummins

engine parts ISF3.8 cylinder head 5271866,5258247:

In a piston engine, the main bearings are the bearings on which the crankshaft rotates, usually plain or journal bearings. The bearings hold the crankshaft in place and prevent the forces created by the piston and transmitted to the crankshaft by the connecting rods from dislodging the crankshaft, instead forcing the crank to convert the reciprocating movement into rotation.

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