The crankcase is the central component in the engine. It houses the entire crank mechanism including pistons, cylinders and connecting rods. In utility vehicle engines it often also houses the camshafts. Accessories, the transmission and the engine control system in the cylinder head are attached to the crankcase.
Due to the oil and cooling channels required for cooling and lubrication purposes, the crankcase is the most complex cast part in a combustion engine.