The assembly spray nozzles, code 11.01213-0063.0, play a crucial role in the precise distribution of lubricating or cooling media within the MAN L21/31 engine, ensuring optimal operating conditions for heavily loaded components. Designed for accurate flow characteristics and uniform atomization, these nozzles enable targeted delivery of oil to critical contact surfaces, reducing friction, controlling temperature, and minimizing wear. Their high-quality materials and finely machined internal geometry guarantee consistent performance, resistance to clogging, and long service life even in harsh operating environments. By maintaining efficient lubrication and thermal balance, the spray nozzle assembly directly supports engine efficiency, component longevity, and overall operational safety.

The closing cover, code 11.01288-0075.B, is a key sealing and protection component designed to safeguard the internal spaces of the MAN L21/31 engine from external contamination and lubricant loss. Precisely machined for a perfect fit, it provides pressure resistance, structural rigidity, and effective sealing at designated housing openings and inspection points. In addition to preventing the ingress of dirt, moisture, and salt particles, the cover contributes to improved thermal stability and reduced noise emissions, supporting a controlled and clean internal environment. Its robust construction and corrosion-resistant surface treatment ensure long service life, making it an essential element for reliable engine performance and optimized maintenance intervals in demanding marine and energy applications.

The retaining ring for boring, 108×4, code 06.29020-0215.0, is a precision-engineered fastening element that ensures the secure axial positioning of components within the MAN L21/31 engine assembly. Manufactured from high-strength spring steel and machined to exact dimensional tolerances, it provides reliable locking performance even under continuous vibration, thermal expansion, and dynamic load conditions. Its function is essential for maintaining the integrity of rotating and reciprocating assemblies, preventing unwanted movement and ensuring accurate alignment during long operating cycles. By combining durability with ease of installation and removal, this retaining ring supports efficient maintenance procedures and contributes to the long-term operational reliability of marine and power-generation engines.

The main rocker rack H 27031 is a robust structural component forming the central support and alignment base for the main rocker arms within the Sulzer ASL25 valve train system. Designed to withstand high cyclic loads, vibration, and thermal influence, it ensures precise positioning and synchronized movement of the rocker mechanism. Its rigid construction and accurately machined mounting surfaces minimize deflection and wear, enabling reliable valve timing, smooth power transmission, and reduced mechanical stress. As a key load-bearing element, the main rocker rack plays a vital role in the durability, efficiency, and long-term stability of the engine’s valve actuation system.

The sealing ring H 16523 is a critical component used to achieve leak-free operation in key interfaces of the Sulzer ASL25 engine. Engineered for resistance to oil, temperature variation, and mechanical stress, it maintains elasticity and sealing effectiveness over extended service intervals. By ensuring a secure barrier against fluid loss and ingress of contaminants, this sealing ring protects adjacent components, reduces maintenance requirements, and contributes to the long-term reliability and efficiency of the engine’s fluid-handling systems.

The pipe seal H 16198 is a precision-engineered sealing element designed to ensure a tight and durable interface along pipe connections in the Sulzer ASL25 engine. With its accurately defined dimensions (Ø18 × Ø8 × 1124), this seal provides reliable compensation for thermal expansion, vibration, and pressure fluctuations in fluid systems. Manufactured from high-quality, application-optimized material, it prevents leakage, protects surrounding components from contamination, and supports stable long-term operation of lubrication, fuel, or cooling circuits. Its consistent sealing performance is essential for maintaining system efficiency and operational safety in demanding marine and industrial environments.

The closing cover, code 11.01288-0075.B, plays a vital role in sealing and protecting internal spaces of the MAN L21/31 engine. Installed at designated access points or housing openings, it prevents the escape of lubricants and the entry of contaminants, while also contributing to noise reduction and thermal stability. Engineered for pressure resistance and precise fit, this component ensures safe containment of fluids and maintains a controlled internal environment, which is essential for long-term engine efficiency and reduced maintenance requirements.

Round steel bars, code EN43AE01100028, represent the high-quality raw material basis for manufacturing and reconditioning key components of the MAN L21/31 engine. Produced from carefully selected alloy steel with excellent machinability and mechanical strength, these bars are used to create precision parts such as shafts, pins, bushings, and custom-engineered elements. Their consistent metallurgical properties and dimensional accuracy are essential for achieving tight tolerances, ensuring structural durability, and maintaining the performance standards required in demanding marine and power generation applications.

The protecting cap, code 11.01251-0048.0, is a small but highly important component in the MAN L21/31 engine, designed to shield sensitive connection points and fasteners from contamination, moisture, and mechanical damage. By sealing exposed interfaces, it helps prevent corrosion and the ingress of dirt or salt particles, which is especially critical in marine and offshore environments. Its durable construction ensures long service life and supports cleaner, safer maintenance procedures, contributing to the overall reliability and operational integrity of the engine.

The nut H 33033 is a high-strength fastening component used in the Sulzer ASL25 engine to secure critical bolted joints exposed to dynamic loads and continuous vibration. Engineered for reliable preload retention and resistance to loosening under thermal cycling and mechanical stress, this nut ensures stable and secure assembly of associated components. Its precision-formed threads and controlled material properties provide long service life, structural integrity, and dependable operation, making it an indispensable element in maintaining the overall reliability of the engine.