The cylinder crankcase with code 11.01200-3593-1.L forms the core structural foundation of the MAN L21/31 engine, housing the crankshaft, main bearings, and lower sections of the cylinder assembly. Designed to withstand high combustion forces, torsional loads, and continuous thermal stress, the crankcase ensures precise alignment of all rotating components. Its rigid construction is essential for minimizing vibration, maintaining lubrication integrity, and guaranteeing long-term reliability in demanding marine propulsion and power generation applications.