The water pump in the MAN L21/31 engine, likely identified by code H27075, is a critical component of the engine’s cooling system. It circulates coolant throughout the engine block and cylinder head to dissipate heat generated during combustion. Proper functioning of the water pump is essential to prevent overheating, maintain engine efficiency, and ensure safe operation, especially under demanding marine or industrial conditions.

The oil pan, or sump, in the MAN L21/31 engine (estimated code H21420) serves as the reservoir for engine lubricating oil. It collects and stores the oil as it circulates through the engine, ensuring vital components remain properly lubricated to reduce friction and wear. Made from durable materials to withstand thermal stresses and mechanical impacts, the oil pan is essential for maintaining engine longevity and optimal performance by facilitating efficient oil circulation and cooling.

The sealing ring, designated with code number N66068, is a small but essential part that ensures tight sealing between mechanical interfaces in the ASL25 engine. It prevents fluid leaks and contamination, helping to maintain system pressure and protect internal components. Made from resilient, temperature-resistant materials, this sealing ring can withstand the demanding conditions of diesel engine operation. Proper installation and timely replacement of the sealing ring are key to minimizing maintenance issues and maximizing engine lifespan.

The screw marked with code number H 74129 may appear as a simple fastening element, but it is vital to the structural integrity and maintenance of the ASL25 diesel engine. Designed for high-stress environments, this screw secures engine components with precision and reliability. Its material strength and thread quality prevent loosening under vibration and heat, ensuring consistent alignment and sealing of parts. Regular inspection and proper torque application help maintain the overall durability of the engine system.

The thermometer identified by code H 81214 plays a crucial role in monitoring the operating temperature of key engine systems in the Adriadiesel/Jugoturbina/Zgoda/Sulzer ASL25 diesel engine. Accurate temperature readings are essential for maintaining optimal engine performance and avoiding thermal stress or overheating. This high-precision instrument provides real-time temperature feedback, allowing operators to make timely adjustments to cooling and lubrication systems. Its robust design ensures reliability under harsh engine conditions, making it a fundamental component for safe and efficient operation.

The nut designated as K 81190 serves as a locking and fastening component for threaded pin K 81192 and support K 81260 in the ZV40/48 engine structure. Engineered for high-strength applications, it ensures that connected parts remain securely fastened under dynamic loads and vibrations. Its compatibility with both components highlights its role in maintaining structural integrity and alignment within the engine’s support system. Proper tightening and periodic inspection of this nut are essential for the reliable operation of engine-mounted assemblies.

The support bearing code K 81169 is a vital structural element in the installation and stabilization of the ZV40/48 engine’s exhaust piping. This support maintains alignment and mitigates mechanical vibrations during operation, helping to prevent fatigue and stress on piping joints. Designed to accommodate thermal expansion and heavy exhaust system loads, it plays a critical role in ensuring operational safety and reducing maintenance frequency. Its robust design reflects the engine’s demand for precision and durability in all auxiliary systems.

The disk identified with code number K 72149 is a precision-machined component essential for the smooth functioning of the geared pump K 72106 in the ZV40/48 engine. Its main role is to ensure stable rotation and optimal torque transmission within the pump assembly. Built from wear-resistant materials, this disk endures continuous mechanical stress and high temperatures, making it indispensable for maintaining consistent fluid flow and pressure. Its reliability directly affects the efficiency and durability of the engine’s lubrication or fuel system, depending on the pump's function.

Crankshaft bearings, commonly associated with code H33016, play a vital role in supporting the crankshaft within the engine block, enabling smooth rotation under heavy loads. In the MAN L21/31, these bearings endure significant mechanical and thermal stresses. Failure or excessive wear in crankshaft bearings can lead to severe engine damage. Therefore, consistent inspection, lubrication, and prompt replacement are critical for maintaining engine health and avoiding costly repairs.

Connecting rods in the MAN L21/31, with an estimated code of H33001, serve as the crucial link between pistons and the crankshaft, translating reciprocating motion into rotational energy. Bearings, approximately H33016, support the connecting rods and reduce friction between moving parts. Due to constant mechanical stress, these components are prone to wear and require regular monitoring and maintenance to prevent catastrophic engine failure and ensure smooth operation.