The hexagon screw, code EN61V1230, is a standard threaded fastener used widely in the MAN L21/31 engine assembly. Known for its hexagonal head, it allows for strong torque transfer and secure fastening of engine components. Engineered from high-grade steel, it withstands operational stress, vibration, and high temperatures, playing a vital role in maintaining structural cohesion across various mechanical connections.

The washer, code 06.16169-0004-1.A, serves as a flat, load-distributing element placed between a fastener and the engine surface. It ensures even pressure application and protects mating surfaces from deformation or damage during tightening. In the MAN L21/31 engine, this component contributes to joint stability, corrosion resistance, and proper alignment of components during assembly or servicing operations.

The locking spring washer with code 06.16169-0004.2 is a crucial safety component used in bolted connections within the MAN L21/31 engine. Designed to prevent nuts and bolts from loosening under vibration and thermal expansion, this washer exerts a continuous tension against the fastener head. Its split-ring, spring-like design provides reliable anti-rotation performance, making it essential in securing structural and dynamic parts in both marine propulsion and stationary engine applications.

The pipe identified by code 01.93105-2069.C is a robust fluid transport element in the MAN L21/31 engine, commonly employed in oil, cooling water, or air systems. Engineered to withstand pressure, temperature, and vibration, it ensures consistent and uninterrupted flow between engine components. Its correct routing and durability are key to maintaining thermal balance and fluid integrity across the engine’s operating cycles.

The guide pipe with code 11.01132-0023.A serves as an alignment and routing component within the MAN L21/31 engine, often used to position rods, wires, or fluids through designated channels. Its sturdy cylindrical design maintains directional accuracy and prevents chafing or vibration damage, especially in dynamic environments. This part plays a subtle yet critical role in supporting internal coordination and mechanical reliability.

The straight male stud coupling, code EN8AB12.1, is a vital connector used within the MAN L21/31 engine’s fluid systems. Designed for high-pressure applications, it provides a reliable, leak-proof connection between pipes or hoses, often used in fuel, oil, or hydraulic lines. Its durable metal construction and precision threading ensure long service life and secure performance, even under the demanding conditions of marine propulsion or industrial operation.

Round steel bars, code EN43AE0090, serve as foundational raw materials in the production and repair of various MAN L21/31 engine parts. Known for their high tensile strength, uniform diameter, and machinability, these bars are transformed into essential engine components such as pins, shafts, and mounting elements. Their metallurgical reliability ensures they meet the demanding structural and thermal requirements of diesel engines operating under continuous load.

The spray-nozzle with code 11.01227-0017.A is engineered to provide critical cooling and lubrication to high-heat zones inside the MAN L21/31 engine, such as the piston undersides and cylinder walls. Operating under pressure, it ensures optimal oil atomization and precise fluid delivery, reducing wear and enhancing performance. This component is vital in maintaining thermal balance and extending the service life of engine internals in marine and industrial applications.

The spray nozzle for control drive, code 11.01213-0060-1.0, is a key precision component within the MAN L21/31 engine’s lubrication system. Specifically designed to deliver a fine, targeted stream of oil to the control drive mechanism, this nozzle helps reduce friction and regulate operating temperature. By ensuring reliable lubrication under variable load and speed conditions, it contributes significantly to the overall efficiency and longevity of the engine’s control systems.

The assembly spray nozzles, code 11.01213-0063.0, play a crucial role in the lubrication and cooling systems of the MAN L21/31 engine. Strategically positioned, these nozzles deliver fine, pressurized streams of oil or coolant to targeted areas such as pistons, cylinder walls, or valve assemblies. Their precise flow helps regulate temperature, minimize friction, and extend component life, making them indispensable for efficient and long-lasting engine performance.