The gasket, code 100100, is an important sealing component used in the MAN L21/31 engine to establish a reliable, leak-tight joint between mating surfaces of engine parts and assemblies. Depending on its specific installation position, the gasket may provide sealing against lubricating oil, fuel, cooling water, compressed air, gases, or other operating media while compensating for minor irregularities between adjoining surfaces. During engine operation, it may be exposed to pressure variations, vibration, thermal cycling, mechanical loading, and contact with different fluids, making appropriate material selection and dimensional accuracy essential for dependable performance. Correct surface preparation, installation, and tightening of the associated fasteners help ensure uniform gasket compression and effective sealing. By preventing leakage, contamination, and pressure losses, the gasket contributes to safe operation, efficient maintenance, protection of associated components, and the long service life of the MAN L21/31 engine.