The cylinder unit, code P50515-19, represents the core combustion module of the MAN L21/31 engine, consisting of the cylinder liner, piston, piston rings, connecting rod, and associated components. This integrated assembly is engineered to withstand extreme pressures and temperatures generated during the combustion process. Its high-performance design ensures efficient power generation, minimal wear, and ease of replacement during overhauls. As the heart of each engine cylinder, the unit is vital for delivering reliable propulsion and energy output over long operational cycles.

The indicator valve, code P50508-07, is a crucial diagnostic component mounted on the MAN L21/31 cylinder head, enabling engineers to measure internal cylinder pressure during engine operation. By allowing temporary access to the combustion chamber, it facilitates performance analysis through indicator diagrams and helps detect abnormalities such as misfiring, loss of compression, or injector malfunction. Its robust construction ensures safe operation under high-pressure conditions, making it an indispensable tool for preventive maintenance and engine tuning in marine and industrial applications.

The shaft with code K 28025 is specifically designed to support and align the main rocker arm (K 28005) within the ZV40/48 engine. This robust shaft acts as a pivot point for the rocker arm, allowing it to transfer motion from the camshaft to the valves with mechanical precision. Built from hardened, wear-resistant steel, it must withstand constant mechanical stress and thermal cycling. Its proper function is essential for maintaining accurate valve timing and reducing wear in the valve train, directly affecting engine efficiency and reliability over time.

The water guide jacket, code P50507-03, plays a vital role in the thermal management of the MAN L21/31 engine by channeling coolant around critical engine components, such as the cylinder liners and combustion chamber. It ensures even heat distribution, prevents hotspots, and supports optimal engine temperature during operation. Constructed from corrosion-resistant materials, the jacket helps extend the life of internal parts and safeguards the engine against overheating, making it indispensable for sustained high-performance use at sea or in power plant conditions.

The cylinder head, code P50501-27, is one of the most critical components in the MAN L21/31 engine, forming the upper seal of the combustion chamber. It houses the intake and exhaust valves, fuel injectors, and part of the cooling and lubrication circuits. Designed for high durability and thermal stability, the cylinder head must endure extreme temperatures and pressures during continuous engine operation. Its precise machining and structural integrity are key to maintaining efficient combustion, proper sealing, and overall engine performance in both marine and power generation applications.

The O-ring coded K 28045 is a specialized sealing component used with flange K 28030 in the ZV40/48 diesel engine. Designed to provide a tight, leak-free seal in high-pressure and high-temperature environments, this elastomeric ring prevents oil or gas escape from the flange connection. Its flexibility, resistance to thermal expansion, and chemical durability make it indispensable for maintaining internal system pressure and preventing operational losses. As part of the engine’s sealing network, it supports overall performance and reliability.

Jacketed packing rings with code EN14U2429 are advanced sealing elements used in critical areas of the MAN L21/31 engine where high-performance sealing is required. Featuring a soft core (often graphite or PTFE) surrounded by a durable metal jacket, these rings combine flexibility with strength, adapting to surface imperfections while resisting extreme heat and pressure. They are commonly installed in exhaust, cylinder, or high-pressure sealing areas, ensuring leak-proof performance and long-term durability.

Plug screws with code EN47AR10 are essential sealing and closure components within the MAN L21/31 engine. Typically used to block access points, inspection holes, or internal fluid pathways, these screws are engineered to withstand high pressure and temperature fluctuations. Their robust, corrosion-resistant construction ensures a tight and lasting seal, contributing to engine integrity and preventing fluid leaks during demanding marine or industrial operation.

The ring coded K 27010 is a specially designed support and locking element used in combination with component K 27008 in the ZV40/48 engine assembly. It ensures secure positioning and mechanical stability of the mating part, particularly under dynamic engine conditions involving vibration, thermal expansion, or pressure fluctuations. Manufactured with tight tolerances and wear-resistant materials, this ring plays an important role in maintaining sealing integrity and axial alignment. Its durable construction helps extend the lifespan of the assembly and supports reliable engine operation in harsh industrial and marine environments.

The silicone paste sealing material, code EN14AM0.001, is a versatile and high-performance compound used in the MAN L21/31 engine for sealing joints and preventing fluid leaks. Applied during assembly between metal surfaces such as flanges or covers, it fills microscopic gaps and resists heat, oil, and pressure. This packing material enhances engine cleanliness and reduces maintenance by maintaining tight seals over extended service intervals, even under harsh operational conditions.

The stud with code 06.06136-2817.0 is a dual-threaded fastener used in the MAN L21/31 engine for securing components such as cylinder heads, covers, or housings. Featuring threads on both ends, this stud enables strong mechanical connections through nut fastening while allowing precise alignment and reusability during engine maintenance. Manufactured from high-strength steel to withstand thermal expansion and vibration, it ensures structural integrity in high-stress applications common in marine and power-generation settings.

The nut with code K 27039 is a precision fastener designed specifically for securing stud K 11122 within the ZV40/48 diesel engine assembly. Built to resist vibration, high torque, and thermal cycling, it plays a critical role in maintaining mechanical stability across connected components such as covers, manifolds, or housings. Its precise threading and high-strength alloy composition ensure tight fastening without loosening during operation, contributing to engine safety and long-term reliability.

The locking spring washer, code 06.16169-0006.1, is designed to exert consistent tension on fasteners, helping to maintain clamping force in the MAN L21/31 engine even under thermal cycling and vibration. Its spring-like profile compensates for any loosening tendencies in bolted connections, ensuring mechanical reliability over time. Commonly used in high-stress areas, this washer is vital for the safe and uninterrupted function of engine components.

The lock washer with code 06.16169-0003.0 is a compact but essential component in the MAN L21/31 engine, designed to prevent loosening of fasteners under dynamic loads. Its toothed or serrated structure bites into the mating surfaces, offering mechanical resistance against vibration-induced rotation. This washer ensures that bolts and nuts remain securely fastened, thereby safeguarding the stability of critical engine joints and assemblies during prolonged operation.

The oil cup top part, designated by code K 12031, is an integral component of the engine’s lubrication support system. Positioned to collect or distribute lubricating oil in specific zones of the engine assembly, it helps regulate oil flow and prevent spillage or contamination. Built from oil-resistant and thermally stable materials, this upper segment of the oil cup plays a key role in ensuring consistent lubrication and supporting maintenance-free operation over extended service periods. Its design complements the lower part of the oil cup for seamless integration.

The plate coded K 16216 serves as an essential part of the control room casing in the ZV40/48 diesel engine. Designed for structural integrity and environmental shielding, this plate protects the sensitive control mechanisms housed within the casing from dust, oil mist, moisture, and mechanical impact. It is fabricated from corrosion-resistant materials to ensure long-term durability and consistent performance in demanding industrial or marine settings. The precision fit of this plate helps maintain the alignment of the casing and supports the engine’s overall operational reliability.

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.