The closing cover, code 11.01288-0075.B, plays a vital role in sealing and protecting internal spaces of the MAN L21/31 engine. Installed at designated access points or housing openings, it prevents the escape of lubricants and the entry of contaminants, while also contributing to noise reduction and thermal stability. Engineered for pressure resistance and precise fit, this component ensures safe containment of fluids and maintains a controlled internal environment, which is essential for long-term engine efficiency and reduced maintenance requirements.

The protecting cap, code 11.01251-0048.0, is a small but highly important component in the MAN L21/31 engine, designed to shield sensitive connection points and fasteners from contamination, moisture, and mechanical damage. By sealing exposed interfaces, it helps prevent corrosion and the ingress of dirt or salt particles, which is especially critical in marine and offshore environments. Its durable construction ensures long service life and supports cleaner, safer maintenance procedures, contributing to the overall reliability and operational integrity of the engine.

The O-ring H 27106 is a critical sealing element used in the Sulzer ASL25 engine to provide a leak-free interface in fluid and pressure connections. Manufactured from elastomer specifically selected for resistance to oil, temperature fluctuations, and vibration, this O-ring maintains elasticity and sealing efficiency throughout extended service life. By preventing fluid loss and protecting internal components from contamination, H 27106 plays an essential role in preserving system integrity, ensuring operational safety, and supporting consistent engine performance.

The cover with splash tube, code 11.01213-0057-1.0, is an integrated lubrication management component in the MAN L21/31 engine. Designed to control and direct the flow of lubricating oil inside the engine frame, the splash tube ensures targeted distribution to critical components such as bearings and gear assemblies. By preventing uncontrolled oil dispersion and reducing aeration, it enhances lubrication efficiency and minimizes wear. This component plays a vital role in maintaining oil cleanliness, reducing friction losses, and supporting reliable engine performance under continuous high-load marine and power generation conditions.

The round seal ring, code 06.56936-1507.A, is a precision sealing element used in various fluid systems of the MAN L21/31 engine, including lubrication, cooling, and fuel circuits. Designed to withstand pressure fluctuations, thermal expansion, and vibration, it ensures leak-free connections between mating components. Its resilient material composition provides consistent elasticity and long-term durability, even under demanding marine and industrial operating conditions. Though compact in size, this seal ring plays a decisive role in maintaining system integrity, preventing fluid loss, and safeguarding overall engine reliability.

The referral valve H 27440 “NOVA” is a specialized control component integrated into the Sulzer ASL25 engine’s fluid management system, designed to regulate or redirect flow within designated circuits. Engineered for accurate response, pressure stability, and durability under continuous operational stress, this valve ensures controlled system behavior and reliable protection of downstream components. Its robust construction and precise internal geometry support consistent performance, reduced leakage, and efficient flow regulation, contributing to overall engine reliability and operational safety.

The round seal ring, code 06.56936-1507.A, serves as a dependable sealing element within various systems of the MAN L21/31 engine. Engineered to withstand high pressure and thermal cycling, it ensures tight sealing between components in lubrication, cooling, or fuel circuits. Its circular geometry allows uniform load distribution, reducing the risk of deformation or leakage. Despite its modest size, this seal ring plays an indispensable role in maintaining engine cleanliness, operational efficiency, and long service life in both marine propulsion and stationary power generation applications.

The cylindrical pin, code 06.22020-1214.0, is a precision alignment and positioning element used throughout the MAN L21/31 engine assembly. Designed to ensure exact component placement, it maintains structural alignment between mating parts such as bearing caps, housings, and structural casings. Manufactured from hardened steel to withstand shear forces and vibration, this pin plays a crucial role in maintaining dimensional accuracy and long-term mechanical stability. Though compact in size, it is fundamental to ensuring repeatable assembly quality and reliable engine performance under demanding marine and industrial operating conditions.

The sealing ring H 16521 is a precision sealing element engineered to provide leak-free performance in fluid and pressure interfaces within the Sulzer ASL25 engine. Manufactured from material optimized for resistance to oil, temperature variation, and vibration, it maintains reliable elasticity and sealing efficiency over extended service intervals. By preventing leakage and protecting internal components from contamination, H 16521 contributes directly to system cleanliness, operational efficiency, and the long-term durability of critical engine assemblies.

The gasket with code 06.56936-2355-1.0 is an essential sealing element in the MAN L21/31 engine, used to prevent leakage of fluids or gases between mating surfaces. Designed to withstand pressure, temperature fluctuations, and chemical exposure, this gasket ensures reliable sealing in systems such as lubrication, cooling, or fuel circuits. Its precise fit and material properties contribute directly to engine cleanliness, efficiency, and operational safety, making it indispensable for long-term, trouble-free engine operation in marine and industrial applications.

The tie rod with code 11.01295-0277-1.B is a critical structural fastening element in the MAN L21/31 engine, designed to clamp major engine components such as the cylinder head and crankcase with uniform and controlled pre-tension. Engineered to withstand high mechanical loads, thermal expansion, and continuous vibration, this tie rod ensures even load distribution and long-term dimensional stability of the engine structure. Its high-strength material and precise manufacturing are essential for maintaining sealing integrity, minimizing distortion, and supporting reliable operation in demanding marine and power generation environments.

The nut H 11152 is a high-strength fastening component used in the Sulzer ASL25 engine to secure bolted joints subjected to continuous vibration and mechanical stress. Engineered to maintain consistent clamping force under thermal cycling and dynamic loads, this nut ensures reliable retention of critical assemblies. Its precisely formed threads and controlled material properties support secure installation, resistance to loosening, and long service life, making it an essential element for maintaining structural stability and operational safety.

The cover with splash tube, code 11.01213-0057-1.0, plays a key role in maintaining proper lubrication conditions within the MAN L21/31 engine. Designed to guide lubricating oil precisely where it is needed, it minimizes oil losses and reduces the risk of contamination or foaming. Its robust construction and precise fit contribute to long service life, lower maintenance demands, and reliable engine performance in demanding marine and stationary power environments.

Round steel bars with code EN43AE01100028 are high-quality alloy steel materials used in the manufacture and refurbishment of critical MAN L21/31 engine components. Thanks to their excellent strength, toughness, and machinability, these bars are ideal for producing precision parts such as shafts, pins, studs, and structural elements. Their stable metallurgical properties ensure consistent performance under high mechanical loads and thermal stress, making them an essential base material for reliable marine and power-generation engine applications.

The spring H 74138 is a functional mechanical component used in the Sulzer ASL25 engine to apply controlled force and ensure correct operation of associated assemblies, such as valves or regulating mechanisms. Engineered for high fatigue resistance and dimensional stability, this spring maintains consistent performance under repeated compression, vibration, and thermal stress. Its precisely defined spring characteristics contribute to reliable system response, reduced wear of moving parts, and stable long-term operation of the engine.

Cylindrical pins with code EN1P1228 are essential alignment components used throughout the MAN L21/31 engine to ensure precise positioning of parts such as bearing caps, housings, and covers. Made from hardened steel, these pins provide high shear strength and wear resistance, allowing for accurate assembly and repeatable reassembly during maintenance. Their role is vital in preserving geometric accuracy, preventing misalignment, and maintaining the overall mechanical stability of the engine.

The QS cylinder crankcase with code 0743748-6.2 forms the primary structural backbone of the MAN L21/31 engine, housing the crankshaft, bearings, and cylinder assemblies. Designed to withstand high mechanical loads, combustion forces, and continuous vibration, this crankcase ensures precise alignment of all rotating components. Its robust construction and quality specification (QS) compliance are critical for maintaining engine rigidity, reducing deformation, and supporting reliable long-term operation in demanding marine and power generation applications.

The spiral seal H 81153 is a high-performance sealing component designed to provide reliable sealing in demanding interfaces of the Sulzer ASL25 engine. Its spiral geometry allows effective compensation for thermal expansion, pressure variations, and surface irregularities, ensuring a tight and durable seal under dynamic operating conditions. Manufactured from heat- and pressure-resistant material, this seal minimizes leakage, protects adjacent components, and contributes to the long-term integrity and efficiency of fluid and gas systems within the engine.

The protecting cap with code 11.01251-0048.0 is designed to shield exposed engine components or connection points on the MAN L21/31 engine from contamination, mechanical damage, and environmental influence. Commonly used during operation, maintenance, or storage, this cap helps prevent the ingress of dust, moisture, and debris. Its durable construction contributes to preserving component condition, reducing wear, and supporting safe and efficient maintenance procedures in marine and industrial settings.

The round seal ring with code 06.56936-1507.A is a critical sealing element in the MAN L21/31 engine, designed to prevent leakage of oil, fuel, or cooling media between connected components. Manufactured from high-quality, resilient materials, it provides reliable sealing under fluctuating pressures, temperatures, and vibration. Its ability to accommodate minor movements and thermal expansion helps maintain system integrity, reduce fluid losses, and support stable long-term engine operation in demanding marine and power generation environments.