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 control room casing plate, designated by code K 16201, serves as a structural and protective component in the ZV40/48 engine’s control housing system. Designed to shield and support sensitive control elements, this precision-engineered plate ensures mechanical integrity and environmental isolation from contaminants such as dust, moisture, or oil mist. Built from corrosion-resistant materials, the plate also aids in maintaining the correct alignment and rigidity of the casing. It is a key part of the engine’s instrumentation reliability and long-term operational stability.

The O-ring with code K 21406 is a vital sealing element in the ZV40/48 diesel engine, specifically designed for the cylinder liner interface. Its primary function is to create a pressure-tight seal between the liner and the engine block, preventing the escape of combustion gases and the ingress of coolant into the combustion chamber. Manufactured from high-temperature and chemically resistant elastomer, this O-ring withstands extreme engine conditions while maintaining flexibility and integrity. It plays a crucial role in ensuring proper engine compression and preventing efficiency losses due to internal leaks.

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 nut coded K 27045 is specifically designed to fasten the stud K 27038 within the ZV40/48 diesel engine assembly. Engineered for strength and resistance to vibration, this component ensures that structural connections remain tight under continuous thermal and mechanical loads. Its precision threading provides a secure fit, helping to preserve alignment and load distribution across the connected parts. Whether part of a cylinder head, manifold, or housing, this nut is essential for the long-term durability and operational safety of the engine.

The insert bush coded K 27107 plays a critical role in the precise and stable mounting of the fuel injection valve in the ZV40/48 diesel engine. It acts as an intermediary sleeve, ensuring proper alignment and seating of the injection valve within the cylinder head. Designed to absorb mechanical stress and prevent wear between metallic surfaces, this component contributes to long-term sealing integrity and consistent fuel delivery. Made from heat- and pressure-resistant materials, it supports the injector’s function under high thermal loads and guarantees reliable engine performance across long maintenance intervals.

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 sealing element coded K 27054 is designed to provide an airtight and fluid-tight seal for handle K 27008 in the ZV40/48 diesel engine. This component prevents leakage of oil, fuel, or air around manually operated components such as valves or access ports. Engineered from durable elastomeric or composite sealing materials, it resists wear, temperature fluctuations, and chemical degradation. A reliable seal like K 27054 helps maintain internal pressure integrity, reduces maintenance needs, and protects the engine from contamination and performance loss.

The nut coded K 27209 is a small but essential fastening element in the fuel injection system of the ZV40/48 diesel engine. Specifically designed to secure the fuel injection valve in place, this nut ensures a tight and stable connection capable of withstanding extreme pressure and vibration during engine operation. Made from high-grade, corrosion-resistant steel, it maintains the structural integrity of the fuel delivery system and plays a critical role in preserving injection precision, combustion efficiency, and long-term engine reliability.

The closing cover with code 11.01288-0075.B is a critical sealing component for the MAN L21/31 engine, used to enclose access points or internal chambers. Designed to resist oil pressure, temperature, and environmental contaminants, this cover ensures safe containment of fluids and prevents mechanical ingress. Its role in maintaining a sealed and controlled environment inside the engine contributes directly to operational reliability and reduced maintenance frequency.

The spring identified by code K 27210 is a precision-calibrated component that regulates the opening pressure of the fuel injection valve in the ZV40/48 diesel engine. This spring is responsible for ensuring that fuel is injected into the combustion chamber at the exact moment and pressure required for optimal combustion. Its tension characteristics must remain consistent over thousands of cycles, resisting fatigue and deformation. As a vital part of the fuel system, this spring contributes directly to combustion efficiency, power output, and emission control.

The complete inlet valve, coded K 27500, is a fundamental component of the air intake system in the ZV40/48 diesel engine. This valve governs the flow of fresh air into the combustion chamber, opening at precisely timed intervals to ensure optimal fuel-air mixture and efficient combustion. Built to endure extreme thermal and mechanical stress, the complete assembly includes the valve spindle, guide, springs, and seating surfaces. Its flawless operation is key to maintaining engine power, fuel efficiency, and smooth running under both marine and industrial load conditions.

The cover with splash tube, code 11.01213-0057-1.0, is an integrated component designed to manage the distribution of lubricating oil within the MAN L21/31 engine. It prevents uncontrolled splashing and directs oil toward specific engine parts like bearings and gears, enhancing lubrication and reducing wear. This component is essential for maintaining oil cleanliness, ensuring component longevity, and supporting reliable engine operation under continuous load.

The piston ring coded K 27410 is designed specifically for the starting valve assembly, particularly for part K 27404. It provides a tight seal between the piston and valve housing, preventing air leakage during pressurized starts. Manufactured from high-performance materials, this ring resists deformation, wear, and thermal cycling. Its effectiveness is critical to maintaining the efficiency and responsiveness of the engine's pneumatic starting system.

The spindle coded K 27401 is a key moving component of the starting valve in the ZV40/48 diesel engine. It functions as the actuator that enables or blocks compressed air flow to the cylinders during engine start-up. Engineered for high precision and durability, the spindle must operate flawlessly under sudden pressure changes and high thermal conditions. Its role is essential for reliable engine ignition and smooth transition to full operation.

Round steel bars coded EN43AE01100028 are essential raw materials used in the manufacturing and repair of MAN L21/31 engine components. These bars are made from high-grade steel with excellent machinability and strength, enabling them to be transformed into precision-engineered parts such as shafts, pins, or custom fittings. Their consistent diameter and metallurgical properties ensure that the resulting components meet the rigorous demands of marine and industrial engine performance.

The lower spring plate, identified by code K 27502, is an essential support element for the inlet valve spring assembly in the ZV40/48 engine. It provides a stable base that maintains the correct spring tension, ensuring consistent valve timing and proper seating. This component must endure repeated cycles of compression and rebound, and it is built from durable materials to resist fatigue. Its role is crucial in ensuring that the inlet valve operates efficiently, helping the engine achieve optimal air intake and combustion performance.

The valve spindle, code number K 27521, is a core component of the exhaust system in the ZV40/48 diesel engine. It acts as the movable shaft that opens and closes the exhaust valve in synchronization with the engine cycle. Crafted from heat-resistant, wear-resistant materials, this spindle is designed to withstand extreme combustion temperatures and mechanical stress. Its precision engineering ensures tight sealing and smooth operation, directly affecting exhaust flow efficiency and overall engine performance.

The assembly cover with splash tube, code 11.01213-0062.0, serves as a dual-purpose component in the MAN L21/31 engine. It not only seals internal areas from external contaminants but also channels and manages oil flow to prevent splashing and ensure even lubrication. This integrated design minimizes oil loss, enhances thermal management, and supports smoother engine operation under demanding marine and industrial conditions.