The cylinder crankcase, code 11.01203-1642-1.T, is the core structural housing of the MAN L21/31 engine, supporting the crankshaft, main bearings, and cylinder assemblies while absorbing the immense mechanical forces generated during combustion. Engineered for high rigidity and vibration damping, this heavy-duty component ensures precise alignment of all rotating parts and provides the foundation for stable, low-noise engine operation. Its robust design is essential for long service life and reliable performance in continuous marine propulsion and industrial power generation environments.