The O-ring K 74150 is a precision sealing element designed for the casing of the fuel transfer pump K 74102 in the ZV40/48 engine. Manufactured from high-grade elastomer resistant to fuel, temperature fluctuations, and mechanical stress, it ensures a tight, leak-free interface between pump casing components. By preventing fuel seepage and protecting the interior from contamination, K 74150 safeguards pump efficiency, extends service life, and supports consistent fuel delivery. Its small size belies its importance, as this O-ring plays a vital role in maintaining the integrity and safety of the entire fuel transfer system.

The complete exhaust piping K 81100 is a critical subsystem of the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine, responsible for safely channeling high-temperature exhaust gases away from the cylinders and out of the engine room. Engineered to withstand extreme thermal loads, vibration, and corrosive exhaust compounds, this assembly ensures efficient gas flow with minimal backpressure. Its robust construction supports long-term reliability, while precise alignment and smooth internal surfaces help optimize engine performance and reduce emissions. As a major structural and functional component, K 81100 contributes significantly to the engine’s overall operational stability and environmental compliance.

Tihe fresh water preheater, code P51635-14, is an essential thermal-management component in the MAN L21/31 engine, designed to warm the coolant before startup or during low-temperature operation. By raising the temperature of the fresh water circulating through the engine block, the preheater helps reduce cold-start wear, improves combustion efficiency, and enables smoother, faster engine start-up. Particularly valuable in cold climates and marine environments, this preheating system enhances operational readiness and contributes to overall engine longevity.

The lubricating oil cooler, code P51506-22, plays a crucial role in maintaining the thermal stability of the MAN L21/31 engine by reducing the temperature of circulating lubrication oil. Using an efficient heat-exchange design, it protects the oil from overheating, preserves optimal viscosity, and ensures consistent lubrication performance even under heavy loads. This component helps safeguard bearings and internal surfaces from thermal stress, contributing to longer service life and enhanced performance in marine propulsion and auxiliary power systems.

The lubricating oil pump, code P51501-23, is a vital heart of the MAN L21/31 engine’s lubrication system, responsible for circulating oil under controlled pressure to all critical moving components. By ensuring a continuous supply of clean, pressurized oil to bearings, pistons, camshafts, and gears, the pump minimizes friction, prevents metal-to-metal contact, and supports efficient heat removal. Its robust design and precise flow characteristics make it essential for engine durability, especially in demanding marine environments where uninterrupted reliability is mandatory.

Kućište ventila K 74134 ključna je strukturna komponenta pumpe za pretakanje goriva na motoru ZV40/48, namijenjena smještaju i stabiliziranju unutarnjih mehanizama za regulaciju protoka. Izrađeno da izdrži visoke tlakove goriva i stalna radna opterećenja, ovo kućište osigurava precizno usmjeravanje fluida, minimalnu turbulenciju i dosljednu učinkovitost pumpe. Njegova robusna konstrukcija i otpornost na koroziju smanjuju potrebe za održavanjem te štite pouzdanost cijelog sustava opskrbe gorivom. Kao središnji element regulacijskog sklopa, K 74134 osigurava stabilan prijenos goriva i neprekidan rad motora.

The valve body K 74134 is a critical structural component of the fuel transfer pump in the ZV40/48 engine, designed to house and support the internal flow-control mechanisms. Built to withstand high-pressure fuel delivery and continuous operational stress, this component ensures precise fluid routing, minimal turbulence, and consistent pump efficiency. Its durable construction and corrosion-resistant materials help maintain long-term stability, reduce maintenance requirements, and safeguard the performance of the entire fuel supply system. As the core of the pump’s regulation function, K 74134 plays a central role in ensuring reliable fuel transfer and uninterrupted engine operation.

The shaft seal K 74149 is a high-performance sealing component designed specifically for the rotating assembly of part K 74123 in the ZV40/48 engine. Engineered to withstand high rotational speeds, thermal changes, and exposure to fuel and lubricants, this seal maintains a reliable barrier that prevents fluid escape and protects internal components from contamination. Its robust elastomeric construction ensures long service life, reduces wear, and supports smooth, efficient operation of the shaft mechanism, making it essential for maintaining the overall integrity of the assembly.

The tapered connection sleeve K 84469 is a precision-engineered coupling element used to secure the visual flow control device within the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine’s fluid monitoring system. Its conical design ensures a tight, vibration-resistant seal that maintains optimal visibility and prevents leakage even under fluctuating pressures and temperatures. Manufactured for durability and accurate alignment, this sleeve plays a crucial role in ensuring that operators receive clear, uninterrupted visual feedback on fluid movement, thereby improving diagnostic accuracy and enhancing operational safety.

The cooling water pipe connections, code P51630-12, form an integral part of the MAN L21/31 engine’s cooling circuit, ensuring secure and leak-free transport of coolant throughout the engine block and auxiliary systems. Engineered for durability and corrosion resistance, these connections maintain reliable coolant flow, preventing overheating and supporting consistent temperature regulation. Their precise fit and high-quality sealing help safeguard the engine against thermal damage, making them crucial for long-term efficiency and operational stability in both marine and land-based installations.