The main bearing cap, code 11.01254-0168.A, is a key mechanical component in the MAN L21/31 engine, responsible for securing the crankshaft bearings firmly in place. Its robust construction ensures that the rotating crankshaft operates with precise alignment under heavy mechanical loads. Proper design and installation of this part are vital for minimizing vibration, reducing wear on the crankshaft, and maintaining the overall integrity of the engine’s lower structure during continuous operation.