The hexagon bolt, code 06.01014-1317-1.D, is a high-strength fastening element widely used throughout the MAN L21/31 engine assembly. Designed for secure clamping under heavy mechanical loads and vibration, this bolt ensures structural integrity of critical engine components. Manufactured from high-grade steel and engineered to precise specifications, it provides consistent torque retention and long-term reliability, making it indispensable for safe and stable engine operation in both marine and industrial applications.

The bearing disc, code 11.10121-0129.A, is a precision-machined component in the MAN L21/31 engine that supports controlled load distribution within the bearing assembly. It helps stabilize rotating components by maintaining correct spacing and contact surfaces, thereby minimizing friction and wear under high operational loads. Designed to withstand continuous mechanical stress, this bearing disc contributes to smooth engine operation, enhanced durability, and long-term reliability in demanding marine and power generation environments.

The connecting rod bolt H 33030 is a safety-critical fastening element used to secure the connecting rod and cap assembly in the Sulzer ASL25 engine. Engineered to withstand extremely high tensile forces, dynamic loading, and cyclic fatigue, this bolt maintains precise clamping force throughout continuous engine operation. Its controlled material properties and precision threading ensure reliable preload, prevent loosening, and protect the integrity of the crank mechanism, directly supporting long-term engine reliability, mechanical stability, and operational safety.

The internal valve spring H 27092 is a critical dynamic component of the Sulzer ASL25 valve train, designed to maintain precise valve control under high engine speeds and continuous thermal stress. Installed within the valve assembly, this spring ensures consistent closing force and accurate valve timing throughout the engine cycle. Engineered for exceptional fatigue resistance and dimensional stability, H 27092 performs reliably under repeated compression and elevated operating temperatures, directly supporting combustion efficiency, reduced valve wear, and long-term operational stability of the engine.

The main bearing cap, code 11.01254-0168.A, is a critical load-bearing element in the MAN L21/31 engine, securing the crankshaft bearings firmly within the crankcase. Designed to withstand extreme cyclic loads and maintain precise bearing alignment, it plays a vital role in minimizing vibration and ensuring smooth crankshaft rotation. Precision-machined and manufactured from high-strength materials, this component directly influences engine durability, efficiency, and long-term operational stability.

The pressure rod H 27216 is a high-strength mechanical transmission component used in the valve actuation system of the Sulzer ASL25 engine, transferring motion from the camshaft mechanism to the valve assembly. Manufactured for exceptional rigidity, straightness, and surface durability, the pressure rod ensures accurate motion control and consistent valve operation under extreme cyclic loading. By maintaining precise geometry and minimizing deflection, H 27216 helps preserve correct valve timing, reduce vibration, and support the overall efficiency and durability of the engine’s valve train system.

The valve guide H 27153 is a precision-machined component that ensures accurate axial alignment and controlled movement of the engine valve within the cylinder head of the Sulzer ASL25 engine. Designed to withstand high combustion temperatures, continuous mechanical load, and aggressive operating conditions, this valve guide minimizes stem wear and maintains proper valve seating over long service intervals. Its optimized material composition and surface finish reduce friction, support efficient heat transfer from the valve stem to the cylinder head, and play a crucial role in sustaining stable combustion performance and long-term engine reliability.

The round seal ring, code 06.56933-2418.0, is a critical sealing element in the MAN L21/31 engine, used to prevent leakage at static or dynamic joints within oil, fuel, or cooling circuits. Manufactured from durable, heat- and pressure-resistant materials, it ensures reliable sealing even under demanding operating conditions. By maintaining tight connections and preventing contamination or fluid loss, this seal ring contributes directly to engine cleanliness, efficiency, and long-term reliability.

The connecting rod with cover H 33001 is a precision-engineered power transmission component that converts the linear motion of the piston into rotational motion of the crankshaft in the Sulzer ASL25 engine. Designed to handle high compressive and tensile loads, this assembly ensures accurate alignment of the bearing surfaces and smooth force transfer during every engine cycle. Its robust construction, precise machining, and balanced design minimize vibration and bearing wear, making it essential for efficient combustion energy utilization and long-term durability of the engine’s rotating assembly.

The piston H 34001 is a core combustion component of the Sulzer ASL25 engine, engineered to withstand high thermal loads, peak combustion pressures, and continuous mechanical stress. Manufactured from high-strength alloy material with optimized geometry, this piston ensures efficient force transfer from combustion gases to the connecting rod while maintaining excellent thermal stability. Its precision machining supports correct clearances, reduced friction, and controlled oil consumption, contributing to reliable engine performance, long service life, and stable operation in demanding marine and industrial applications.

The connecting rod bearing, code P50604-04, is an essential load-bearing component in the MAN L21/31 engine, enabling smooth rotation between the connecting rod and the crankshaft. Engineered to handle high dynamic loads and continuous lubrication, this precision bearing minimizes friction and absorbs operating stresses during each combustion cycle. Its accurate fit and advanced bearing materials protect critical rotating components, contributing to stable engine operation, reduced wear, and long-term durability under heavy-duty operating conditions.

The nut K 73025 is a robust fastening component used to secure shaft K 73023 within the cooling water pump assembly of the Sulzer ZV40/48 engine. Engineered to maintain axial positioning and clamping force under vibration and continuous mechanical load, this nut ensures stable retention of rotating components during operation. Manufactured from high-strength material with precise threading, it enables secure installation, reliable torque transmission, and long-term resistance to loosening. As a critical locking element, K 73025 plays an essential role in preserving shaft alignment, mechanical integrity, and dependable pump performance.

The O-ring K 73036 is a precision sealing component designed for the cover K 73018 in the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine’s cooling water pump assembly. Its function is to provide a reliable, leak-free seal between the cover and the pump housing, preventing water loss and protecting internal components from external contamination. Manufactured from high-quality elastomer resistant to water, temperature fluctuations, and mechanical compression, this O-ring maintains sealing integrity under continuous operation. Despite its small size, K 73036 plays a crucial role in ensuring pressure stability, operational safety, and long-term reliability of the cooling water pump system.

The exhaust valves, code 50502, play a vital role in controlling the discharge of exhaust gases from the MAN L21/31 engine’s combustion chamber. Operating under extreme temperatures and corrosive conditions, these valves are engineered from high-temperature alloys to ensure durability, tight sealing, and resistance to thermal fatigue. Proper exhaust valve function is essential for maintaining engine efficiency, protecting downstream components such as turbochargers, and ensuring compliance with emission and reliability requirements in continuous-duty operation.

The counter ring K 73026 is a precision-machined sealing and wear component used in the cooling water pump of the Sulzer ZV40/48 engine. Positioned opposite the rotating sealing elements, it provides a stable, wear-resistant contact surface that ensures reliable sealing and controlled friction during pump operation. Engineered to withstand continuous exposure to water, pressure fluctuations, and thermal cycling, this counter ring helps prevent leakage, protects adjacent components, and contributes to the long-term efficiency, reliability, and durability of the cooling water pump system.

The bush K 73012 is a precision bearing sleeve designed for installation in bearing housing K 73011 within the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine’s cooling water pump assembly. Its primary function is to provide a low-friction, wear-resistant support surface for the rotating shaft, ensuring correct alignment and smooth operation under continuous load. Manufactured from materials optimized for lubrication retention and resistance to corrosion and mechanical stress, this bush reduces shaft wear, dampens vibration, and significantly extends the service life of the bearing system, contributing to reliable long-term pump performance.

The additional tools set, code P52002-10, complements the standard maintenance equipment for the MAN L21/31 engine by providing specialized tools for advanced service tasks, overhauls, and precise adjustments. These tools are intended for less frequent but critical maintenance operations that require higher accuracy or access to specific engine components. By enabling professional-level servicing in accordance with manufacturer guidelines, this set enhances maintenance flexibility, shortens downtime, and supports long-term engine reliability.

The bush K 73112 is a precision bearing sleeve designed for installation in bearing housing K 73111 within the ZV40/48 raw water pump assembly. Its function is to provide a low-friction, wear-resistant support surface for the rotating shaft, ensuring correct alignment and smooth operation. Manufactured from materials optimized for lubrication retention and resistance to corrosion and mechanical stress, this bush reduces shaft wear and extends bearing service life. As a small but essential component, K 73112 contributes significantly to vibration control, operational stability, and the overall durability of the pump assembly.

The shaft K 73123 is a precision-machined drive component of the raw water pump in the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine, responsible for transmitting rotational power from the drive system to the pump impeller. Designed to operate under continuous load, vibration, and exposure to seawater-side conditions, the shaft ensures accurate alignment and smooth torque transfer. Manufactured from high-strength, corrosion-resistant material, K 73123 minimizes wear on bearings and seals, supports stable pump performance, and plays a key role in maintaining reliable engine cooling under demanding marine and industrial operating conditions.

The expansion bellow, code P51914-01, serves as a flexible element within the MAN L21/31 engine systems, allowing controlled movement while maintaining tightness in pipelines or exhaust connections. Designed to withstand high temperatures, pressure variations, and continuous vibration, the bellow effectively compensates for thermal growth and alignment deviations. By minimizing mechanical stress on surrounding components, the expansion bellow enhances system durability, reduces maintenance requirements, and ensures stable performance under high-load marine and industrial operating conditions.