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 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.

The O-ring H 27106 is a critical sealing element used in the Sulzer ASL25 engine to provide a leak-free interface in fluid and pressure connections. Manufactured from elastomer specifically selected for resistance to oil, temperature fluctuations, and vibration, this O-ring maintains elasticity and sealing efficiency throughout extended service life. By preventing fluid loss and protecting internal components from contamination, H 27106 plays an essential role in preserving system integrity, ensuring operational safety, and supporting consistent engine performance.

The auxiliary rocker arm shaft H 27036 is a precision-machined structural and functional component within the Sulzer ASL25 valve train system, serving as the rotational support and alignment axis for the auxiliary rocker arms. Designed to withstand continuous cyclic loading, vibration, and thermal influence, this shaft ensures smooth oscillating motion and accurate valve actuation. Its high-strength material, optimized surface finish, and strict dimensional tolerances minimize wear and maintain precise geometry over long operating intervals, contributing directly to reliable valve timing, reduced mechanical losses, and long-term engine durability.

The protecting cap, code 11.01251-0048.0, serves as a protective barrier within the MAN L21/31 engine assembly, shielding sensitive components from contamination, moisture, and mechanical damage. Typically installed over exposed interfaces or fastening points, it helps preserve internal cleanliness and prevent corrosion. Manufactured from durable materials suited for harsh operational environments, the protecting cap contributes to extended service intervals and reduced maintenance needs. Its function may appear simple, but it is essential for maintaining the engine’s structural and operational integrity over time.

The auxiliary rocker stand H 27035 is a structural support component within the Sulzer ASL25 valve train assembly, designed to securely position and stabilize auxiliary rocker mechanisms. Built to withstand repetitive mechanical loading, vibration, and thermal influences, this stand ensures correct alignment and smooth operation of the rocker system. Its rigid construction and precise mounting surfaces minimize deflection and wear, contributing to accurate valve actuation, reduced mechanical stress, and long-term durability of the engine’s valve train system.

The referral valve H 27440 “NOVA” is a specialized control component integrated into the Sulzer ASL25 engine’s fluid management system, designed to regulate or redirect flow within designated circuits. Engineered for accurate response, pressure stability, and durability under continuous operational stress, this valve ensures controlled system behavior and reliable protection of downstream components. Its robust construction and precise internal geometry support consistent performance, reduced leakage, and efficient flow regulation, contributing to overall engine reliability and operational safety.

The nut H 27218 is a high-strength fastening component used in critical assemblies of the Sulzer ASL25 engine where secure clamping and long-term stability are essential. Designed to maintain consistent preload under vibration, thermal expansion, and dynamic mechanical loads, this nut ensures reliable retention of associated components. Its precision-machined threads and controlled material properties provide resistance to loosening and fatigue, safeguarding the structural integrity of the assembly. Though compact in size, the H 27218 nut plays a vital role in maintaining dependable engine performance in demanding marine and industrial environments.