The pipe clamp, code 06.66012-1101.0, is an important support component in the MAN L21/31 engine, used to securely fasten pipes and hoses to the engine structure. It prevents unwanted movement, vibration, and mechanical stress on fluid lines, reducing the risk of fatigue or leakage. Designed for durability and precise fit, the pipe clamp supports safe routing of oil, fuel, and cooling lines, contributing to orderly installation, easier maintenance, and dependable engine operation in harsh marine and industrial environments.

The plug screw, code 06.08045-0144.0, is a precision sealing fastener used in the MAN L21/31 engine to close threaded ports in lubrication, cooling, or fuel systems. Designed to withstand pressure, temperature fluctuations, and vibration, this component ensures leak-free sealing of inspection openings or fluid channels. Its robust material quality and accurate thread geometry are essential for maintaining system integrity and preventing fluid loss during continuous marine or stationary engine operation.

The connecting rod bolt H 33030 is a safety-critical fastening element designed to secure the connecting rod and cap assembly in the Sulzer ASL25 engine. Engineered for extremely high tensile loads and fatigue resistance, this bolt maintains clamping force under dynamic inertia forces and high-cycle engine operation. Manufactured with precise threading and controlled material properties, it ensures reliable preload, prevents loosening, and safeguards the integrity of the crank mechanism, directly supporting long-term engine reliability and operational safety.

Round steel bars, code EN43AE00350145, are high-grade raw materials used in the manufacture and refurbishment of various MAN L21/31 engine components. Produced from EN43AE alloy steel, these bars offer excellent strength, toughness, and machinability, making them suitable for precision parts such as shafts, pins, and structural elements. Their consistent mechanical properties and dimensional accuracy ensure that finished components meet strict engine specifications, supporting reliable performance in marine and industrial diesel engine applications.

The cylinder liner, code P50610-12, is a critical wear component in the MAN L21/31 engine, forming the inner running surface of the cylinder where the piston operates. Designed to withstand high combustion pressures, temperatures, and continuous friction, the liner ensures optimal sealing, controlled oil consumption, and efficient heat transfer to the cooling system. Manufactured from high-quality, wear-resistant materials with precision machining, the cylinder liner plays a key role in maintaining engine efficiency, reliability, and extended service life in demanding marine and power generation applications.

The O-ring K 73037 is a high-performance sealing element installed in bearing housing K 73011 of the ZV40/48 cooling water pump. Designed to withstand constant exposure to water, vibration, and thermal cycling, it provides an effective barrier against leakage and ingress of contaminants into the bearing area. Its precise dimensions and durable elastomer material ensure consistent sealing performance, protecting bearings from premature wear and corrosion. By safeguarding the bearing housing, the O-ring K 73037 contributes directly to smooth pump operation, extended service intervals, and overall system reliability.

Big-end bearings, code 50601, are essential load-bearing components connecting the connecting rod to the crankshaft in the MAN L21/31 engine. These precision bearings are designed to withstand high dynamic loads, rotational speeds, and continuous lubrication demands while ensuring smooth crankshaft motion. Their accurate fit and advanced bearing materials reduce friction and wear, protect the crankshaft journals, and play a key role in maintaining engine reliability, efficiency, and long service life under heavy-duty marine and stationary operating conditions.

The inlet valve seat, code 50501, is a critical combustion chamber component in the MAN L21/31 engine, providing a precise sealing surface for the inlet valve. Designed to withstand repeated thermal cycling and mechanical loading, the valve seat ensures reliable air admission into the cylinder while maintaining optimal compression integrity. Manufactured from wear- and heat-resistant materials, it minimizes erosion and deformation, contributing to stable engine performance, efficient combustion, and extended service intervals in demanding marine and power generation applications.

The shaft K 73023 is a critical drive component of the cooling water pump in the ZV40/48 engine, responsible for transmitting rotational power from the drive mechanism to the pump’s internal elements. Designed to operate reliably under constant load, vibration, and thermal influence, this shaft ensures precise alignment and efficient torque transfer throughout operation. Manufactured from high-strength, corrosion-resistant material, K 73023 minimizes wear on bearings and seals, supports stable pump performance, and plays a key role in maintaining effective engine cooling in demanding marine and industrial environments.

The hand tools set, code P52004-02, includes high-quality manual tools designed for everyday mechanical work on the MAN L21/31 engine. Comprising items such as spanners, wrenches, screwdrivers, and auxiliary tools, this set supports safe and precise handling of fasteners and components during maintenance and repair. Built for durability and ergonomic use in demanding environments, these hand tools are indispensable for efficient onboard servicing and workshop operations, ensuring consistent workmanship and reduced wear on engine parts.

The standard tools for normal maintenance, code P52000-24, form a comprehensive toolkit specifically selected for routine servicing of the MAN L21/31 engine. This set includes all essential tools required for regular inspections, adjustments, and basic maintenance tasks, enabling safe and efficient work directly on site. Designed to match MAN’s technical specifications, these tools ensure correct handling of engine components, reduce the risk of improper servicing, and support reliable day-to-day operation in marine and power generation applications.

The gear wheel K 73124 is a robust power-transmission component used in the drive mechanism of the ZV40/48 raw water pump. Engineered for precise meshing and efficient torque transfer, this gear wheel ensures synchronized operation between the drive shaft and the pump assembly. Its hardened tooth profile and dimensional accuracy reduce noise, vibration, and mechanical losses while enhancing durability under continuous operation. By maintaining consistent pump speed and load distribution, K 73124 contributes directly to dependable cooling water circulation and long-term reliability of the pump system.

The flexible hose with code P51912-01 is an essential connection component in the MAN L21/31 engine, used for the safe transport of fluids or air between engine systems. Engineered to absorb vibration, movement, and thermal expansion, this hose prevents stress transmission to rigid pipes and fittings. Its reinforced construction ensures resistance to pressure, temperature extremes, and harsh operating environments, contributing to improved system reliability, easier installation, and reduced risk of leaks in marine propulsion and stationary power applications.

The expansion joint with code P51913-01 is a critical component in the MAN L21/31 engine’s piping and exhaust systems, designed to compensate for thermal expansion and mechanical movement during operation. By absorbing axial, lateral, and angular displacements, the expansion joint protects rigid pipes and connected equipment from excessive stress, fatigue, and cracking caused by temperature fluctuations and vibration. Its robust, flexible construction ensures long-term reliability, reduces structural loads, and supports safe and efficient engine operation in demanding marine and power generation environments.

The complete raw water pump casing K 73102 forms the structural and hydraulic core of the cooling water pump assembly in the ZV40/48 engine. Designed to house and precisely align the impeller, shaft, and sealing components, this casing ensures efficient water flow with minimal losses and high operational stability. Built to withstand corrosion, pressure fluctuations, and continuous operation, its robust construction protects internal components and maintains long-term dimensional integrity. As a fully assembled unit, K 73102 plays a key role in ensuring dependable raw water circulation and effective engine cooling.

The expansion joint, code P51913-01, plays a critical role in compensating for thermal expansion and mechanical movement within the MAN L21/31 engine’s piping or exhaust systems. Designed to absorb axial, lateral, and angular displacement, it protects connected components from stress, fatigue, and cracking caused by temperature changes and vibration. Its robust and flexible design ensures long-term durability, reduces structural loads on adjoining equipment, and supports safe, efficient engine operation under continuous high-load marine and industrial conditions.

The conical element, code P51903-02, is a precision-engineered component used in the MAN L21/31 engine for controlled flow guidance, sealing, or mechanical alignment, depending on its application within the system. Its tapered geometry ensures accurate centering and secure seating between mating parts, helping to distribute loads evenly and prevent leakage or misalignment. Manufactured from high-quality materials to withstand pressure, temperature variations, and vibration, the conical element contributes to system stability, reliable operation, and long service life in demanding marine and industrial environments.

The O-ring K 74151 is a high-performance sealing element designed to complement packing ring K 74130 in the ZV40/48 engine’s auxiliary systems. Manufactured from fuel- and oil-resistant elastomer, it provides an additional sealing barrier that prevents leakage under pressure, temperature fluctuations, and vibration. By maintaining tight sealing integrity and protecting adjacent components from contamination, this O-ring supports stable operation, extends service intervals, and enhances the overall reliability of the sealing assembly.

The kit for the pressure valve, code P51731-04, provides the necessary parts to overhaul or replace the pressure-control valve within the MAN L21/31 engine’s lubrication or fuel system. The pressure valve regulates system pressure, ensuring stable operating conditions, protecting sensitive components, and maintaining optimal flow rates. Over time, valve components may wear or lose calibration due to vibration, thermal stress, or contaminant exposure. This renewal kit restores precise pressure regulation, safeguarding engine performance, preventing lubrication failures, and supporting long-term operational stability in demanding marine and stationary engine environments.

The kit for renewal of piston rings, code P51706-03, provides all essential components needed to restore optimal sealing and compression performance in the MAN L21/31 engine. Piston rings are critical for maintaining combustion efficiency, regulating oil consumption, and ensuring proper heat transfer from the piston to the cylinder liner. Over time, rings wear due to high pressure and thermal cycling, and this renewal kit ensures a complete and precise replacement process. By restoring tight sealing and reducing blow-by, the kit contributes to improved engine efficiency, lower emissions, and extended service life—an indispensable maintenance solution for engines operating under heavy marine or industrial loads.