The document discusses the key components of an engine crankshaft, including the main bearings, connecting rods, counterweights, crank throws, and lubrication holes. It notes that nodular cast iron is used for less stressed crankshafts, while alloyed ductile iron materials are used for more heavily loaded crankshafts due to their high temperature resistance, fatigue resistance, hardness, strength, torsional and bending resistance, and wear resistance. It provides several references on crankshaft design, materials, and manufacturing.