The drain trap, code P51208-03, is a vital part of the MAN L21/31 engine's turbocharging and air intake system, designed to collect and expel condensed water or oil mist before it can enter the combustion chambers. Its function ensures cleaner intake air and protects critical engine components from corrosion or damage caused by accumulated moisture. Essential in humid or marine environments, the drain trap contributes to improved operational reliability and longevity.

The screw connection K 92182 is a precision fastening element designed specifically for securing component K 92166 within the piping or structural systems of the ZV40/48 engine. Engineered to deliver strong, vibration-resistant engagement, this connection ensures proper alignment, mechanical stability, and leak-free performance in high-pressure, high-temperature conditions. Its robust thread integrity and corrosion-resistant material construction help maintain long-term reliability, preventing loosening or deterioration over extended operating periods. As a small but essential element, K 92182 plays a crucial role in maintaining the integrity and durability of the engine’s auxiliary assemblies.

The block-ball cock K 87165 is a vital safety and serviceability component within the ZV40/48 engine’s fuel delivery system, allowing operators to isolate or shut off fuel flow quickly and securely. Designed with a durable spherical sealing mechanism, this valve ensures tight closure under high pressure while providing smooth and reliable operation, even in harsh working conditions. Its use improves maintenance efficiency, enhances system safety during repairs or emergencies, and prevents unwanted fuel leakage. By ensuring precise and dependable flow control, the K 87165 block-ball cock supports both operational stability and environmental protection.

The fuel supply pipe K 87160 is a precisely engineered conduit responsible for delivering a steady, contamination-free flow of fuel to the combustion system of the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine. Built to withstand high pressure, vibration, and continuous thermal stress, this pipe ensures uninterrupted and uniform fuel distribution to each cylinder, which is essential for stable engine performance and efficient combustion. Its robust construction and corrosion-resistant materials help prevent leaks, pressure drops, and premature wear, making K 87160 a critical component for reliable long-term operation in demanding marine and power-generation environments.

The coupling flange, code P51113-01, is a solid mechanical interface in the MAN L21/31 engine, enabling the secure joining of rotating shafts. Precision-engineered for torque transmission, it provides structural integrity and alignment between connected machinery elements such as gearboxes or auxiliary equipment. With high resistance to wear and mechanical stress, this flange is essential for maintaining stable and efficient rotational performance, especially under variable loads typical of marine propulsion systems.

The frame covers, code P51106-36, are protective enclosures mounted on the MAN L21/31 engine’s structural frame to shield internal systems from environmental exposure. These robust panels safeguard against dust, moisture, and accidental contact, ensuring the cleanliness and safety of the engine’s inner mechanisms. Their precise fit and durable construction contribute to both noise insulation and thermal protection, supporting long-term engine reliability in harsh operating environments.

The flexible coupling, code P51005-03, plays a crucial role in the MAN L21/31 engine drivetrain by compensating for misalignment and absorbing vibrations between rotating components such as the engine and generator or shaft. Constructed from resilient materials and designed for torsional flexibility, it ensures smooth power transmission while protecting connected equipment from mechanical stress. Its use enhances operational safety, extends the lifespan of adjacent components, and supports efficient performance under demanding marine and industrial conditions.

The complete relief valve assembly K 86050 is a safety-critical component installed on the starting air line of the Sulzer/Adriadiesel ZV40/48 engine, designed to protect the system from excessive pressure buildup during engine cranking. Engineered for rapid response and reliable opening under sudden pressure spikes, this valve prevents dangerous over-pressurization and safeguards both piping and auxiliary equipment. Its robust construction ensures consistent performance even in harsh operating conditions, while precise spring-loaded calibration maintains optimal safety margins. The K 86050 relief valve is essential for maintaining the integrity, reliability, and safe operation of high-pressure starting air systems on large marine and industrial engines.

The sleeve K 87087 is a highly durable guide and sealing element positioned inside the ZV40/48 engine’s pressure-regulating valve, where it ensures smooth, low-friction movement of the internal spindle and maintains precise hydraulic sealing. Manufactured to withstand pulsating pressures and continuous thermal variations, this sleeve upholds correct alignment and minimizes component wear, contributing to stable pressure control throughout engine operation. By protecting the spindle and valve body from abrasion and deformation, the sleeve K 87087 ensures long service life, reliable performance, and precise regulation of critical fuel or lubrication flows in heavy-duty engine applications.

The lock nut K 87093 is a precision-engineered securing component used on spindle K 87088 within the pressure-regulating systems of the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 diesel engine. Designed to maintain exact axial positioning under extreme vibration and thermal cycling, this lock nut ensures the stability and reliability of the valve mechanism throughout long operating intervals. By preventing loosening, thread damage, and micro-movement under load, it plays a vital role in safeguarding the accuracy of the regulating assembly, directly supporting consistent engine performance and long-term durability across demanding marine and power-plant environments.