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 flexible hose, code P51912-01, is an essential connection component in the MAN L21/31 engine, designed to safely transport fluids or air while accommodating movement, vibration, and thermal expansion. Its reinforced construction allows it to withstand pressure fluctuations, temperature extremes, and aggressive operating conditions without compromising integrity. By absorbing mechanical stresses and preventing rigid pipe failures, this flexible hose enhances system reliability, simplifies installation, and reduces maintenance requirements in marine propulsion and power generation applications.

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 left-hand exhaust bend K 81132 is a robust piping component forming part of the exhaust system of the ZV40/48 engine, designed to guide exhaust gases smoothly through directional changes in the exhaust line. Built to withstand high exhaust temperatures, vibration, and corrosive gas compounds, this bend ensures efficient gas flow with minimal pressure loss. Its precise geometry supports correct alignment within the exhaust assembly, reduces mechanical stress on connected sections, and contributes to the durability and safe operation of the complete exhaust piping system in heavy-duty marine and power-generation 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 thrust ring K 74132 is a precision-machined bearing component designed to control axial movement of gear wheel K 74126 within the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine. Engineered to absorb axial loads and reduce friction during gear operation, this ring ensures stable gear alignment and smooth power transmission under continuous mechanical stress. Its durable construction minimizes wear on mating components, protects the gearbox assembly, and contributes to long-term reliability and consistent performance in demanding marine and industrial applications.

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 the cover of the centrifugal filter, code P51715-01, includes the components required to service and restore the protective housing of the MAN L21/31 engine’s centrifugal oil filtration system. The centrifugal filter is vital for removing fine contaminants from lubricating oil, ensuring cleaner circulation and reducing wear on internal components. Maintaining the filter cover ensures proper sealing, safe operation at high rotation speeds, and protection of the filtration system from external contaminants. By ensuring the filter performs at peak efficiency, this kit supports longer oil life, improved lubrication quality, and greater overall engine reliability.

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.

The O-ring K 74152 is a high-performance sealing component specifically designed for the pump impeller K 74123 used in the ZV40/48 fuel transfer system. Exposed to rotational forces, fuel contact, and thermal variations, this O-ring provides essential sealing between the impeller and adjacent housing surfaces. Its durable, fuel-resistant material reduces wear, maintains pressure stability, and prevents internal leakage, ensuring smooth hydraulic performance. The reliability of the K 74152 O-ring directly influences pump output efficiency and helps guarantee uninterrupted and balanced fuel flow throughout engine operation.