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.

The lubricating oil cooler, code P51506-22, is a vital heat-exchange component in the MAN L21/31 engine, responsible for maintaining the correct operating temperature of the lubricating oil. By cooling the oil as it circulates through the engine, the cooler prevents overheating, preserves oil viscosity, and ensures stable lubrication across all moving parts. Its robust construction and thermal efficiency are essential for protecting bearings, pistons, and gear systems from thermal stress, making it indispensable for engines operating in demanding marine environments or high-load industrial applications.

The centrifugal bypass filter, code P51515-07, is a highly efficient secondary filtration system used in the MAN L21/31 engine to remove fine contaminants from lubricating oil. Unlike conventional filters, it uses centrifugal force to separate soot, sludge, and microscopic particles from the oil, ensuring cleaner lubrication and extending oil life. By maintaining optimal oil purity, the centrifugal bypass filter significantly reduces wear on critical engine components, enhances long-term durability, and supports reliable performance under the heavy operating demands typical of marine propulsion and continuous-duty power generation.

The expansion piece K 81136 is a flexible exhaust piping component featuring six corrugations, engineered to absorb thermal expansion, vibration, and movement within the ZV40/48 engine’s exhaust system. Its corrugated design allows controlled flexibility while maintaining strength and gas-tight performance under high-temperature exhaust flow. By reducing stress on rigid piping sections and preventing cracking or premature failure, this expansion piece significantly enhances the durability and reliability of the engine’s exhaust line, ensuring stable operation in demanding marine and industrial environments.

The attachment shaft K 81163 is a precision-machined connector used to anchor and support the guide element in the ZV40/48 engine’s structural system. Built for high mechanical strength and resistance to vibration, the shaft ensures stable alignment and smooth interaction between moving and stationary components. Its accurate geometry guarantees proper fit and long-term durability, reducing wear and maintaining the integrity of the guidance system. As a key interface component, K 81163 contributes to consistent operational reliability and extended service life of the engine’s auxiliary assemblies.

The weld-on piece K 81166 is a durable structural component designed to provide a stable mounting surface for the guide element within the Sulzer/Adriadiesel/Jugoturbina/Zgoda ZV40/48 engine. Manufactured to withstand thermal expansion, vibration, and continuous operational loads, this weldable part ensures precise positioning and secure integration into the engine’s support framework. Its robust design enhances the rigidity of the guide assembly, prevents misalignment over long operating periods, and contributes to the engine’s overall mechanical reliability.

The pressure regulating valve, code P51507-03, maintains optimal oil pressure within the MAN L21/31 engine’s lubrication circuit, protecting critical parts from both insufficient lubrication and excessive pressure. By automatically adjusting flow based on engine demand, this valve ensures stable operating conditions and contributes to consistent temperature control. Its precision and reliability make it indispensable for safeguarding engine health, especially during load fluctuations and extended operation in demanding environments.

The lubricating oil pump, code P51501-25, serves as the heart of the MAN L21/31 engine’s lubrication system, delivering pressurized oil to all bearings, gears, and moving components. Engineered for durability and flow consistency, the pump ensures that friction is minimized and heat is efficiently dissipated throughout the engine. Its stable performance is essential for preventing component failure, reducing mechanical losses, and supporting long-term reliability, particularly in high-load marine propulsion and industrial power generation applications.

The lubricating oil filter, code P51502-16, is a key protective element in the MAN L21/31 engine’s lubrication system, ensuring that circulating oil remains free from contaminants such as metal particles, soot, and sludge. By maintaining oil cleanliness, the filter reduces wear on bearings, pistons, and other precision components, significantly extending engine life and improving operational reliability. Its high filtration efficiency is especially critical under heavy-duty marine and power plant conditions where engines operate continuously and demand consistent lubrication quality.

The visual flow control device K 84465 is an eight-position inspection element used in the ZV40/48 engine to allow operators to visually verify fluid movement, direction, and condition within the system. Designed for clarity, durability, and resistance to pressure and temperature fluctuations, this component enhances situational awareness during operation and maintenance. Its multi-position configuration enables precise monitoring of flow changes, making it easier to detect irregularities, contamination, or flow interruptions. By providing immediate visual feedback, K 84465 significantly improves reliability, safety, and diagnostic speed in complex engine environments.