The thermostat housing with code 11.41100-0626.0 forms the protective and functional enclosure for the cooling water thermostat in the MAN L21/31 engine. This robust housing ensures proper coolant routing, pressure containment, and leak-free operation within the engine’s cooling circuit. Engineered for high thermal resistance and mechanical strength, the thermostat housing plays a vital role in maintaining precise temperature control, safeguarding internal components, and ensuring reliable engine operation under continuous load conditions.

The cooling water thermostat with code 11.06011-0073.0 is a critical temperature-regulating component in the MAN L21/31 engine, responsible for maintaining the engine within its optimal operating temperature range. By automatically controlling coolant flow based on thermal conditions, the thermostat ensures rapid warm-up, stable combustion performance, and effective protection against overheating. Its precise response characteristics directly contribute to improved fuel efficiency, reduced mechanical wear, and extended service life — especially under continuous heavy-duty marine and power-generation operation.

The valve H 27702 is a critical flow-control component within the Sulzer ASL25 engine’s combustion system, responsible for regulating the intake and exhaust gas exchange during each engine cycle. Engineered for high-temperature resistance, wear durability, and dimensional stability, this valve ensures tight sealing, efficient airflow, and optimal combustion performance. Its robust construction and precision machining reduce leakage, support consistent power output, and extend service life under continuous heavy-duty operation in marine and industrial environments.

The seal ring with code 06.56190-0739-1.0 is a precision sealing element used throughout the MAN L21/31 engine to protect critical systems from fluid leakage and pressure loss. Designed to withstand aggressive temperatures, pressure fluctuations, and chemical exposure, this ring provides long-term elastic sealing performance in lubricating oil, fuel, and cooling circuits. Its reliability is essential for preserving system cleanliness, reducing wear, and ensuring continuous, trouble-free engine operation in demanding marine and industrial environments.

The tie rod with code 11.01295-0276-1.C is a critical structural fastener in the MAN L21/31 engine, designed to clamp the cylinder block, crankcase, and cylinder head into a rigid and precisely aligned assembly. Manufactured from high-tensile alloy steel, this component maintains uniform clamping force across the engine structure, even under extreme combustion pressures and thermal expansion. Its strength and dimensional accuracy are essential for preserving engine geometry, minimizing vibration, and preventing leakage, making it a cornerstone of long-term engine reliability in marine propulsion and power generation applications.

The bearing cover screw H 11153 is a high-strength fastening element designed to secure the bearing cover within the Sulzer ASL25 engine’s rotating assembly. Engineered to maintain precise clamping force under continuous vibration, thermal expansion, and dynamic loading, this screw ensures correct bearing alignment and structural integrity of the bearing housing. Its controlled material properties and precision threading provide consistent preload and resistance to loosening, directly supporting reliable bearing performance and long-term engine durability.

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.