The piston is a critical moving part in the MAN L21/31 engine responsible for transferring combustion force to the crankshaft via the connecting rod. Manufactured from durable materials to withstand extreme pressure and temperature, the piston plays a central role in the engine’s power generation and efficiency. Regular inspection and maintenance of pistons help prevent engine wear and sustain performance.

The complete cylinder unit is a fundamental assembly in the MAN L21/31 engine that houses the combustion chamber and associated components. This unit is engineered to withstand high pressure and temperatures while ensuring effective sealing and combustion efficiency. Proper maintenance of the cylinder unit is essential for optimal engine performance and longevity.

The axle is a vital structural component in the MAN L21/31 engine. It supports rotational elements and ensures the precise alignment of moving parts within the engine assembly. The robust design of the axle contributes to the overall stability and smooth operation of the engine, reducing wear and preventing mechanical failures during continuous heavy-duty operation.

The spring plate designated by code K 72140 works in conjunction with the flexible rod K 72135, providing essential tension and support within the ZV40/48 engine assembly. It helps absorb vibration and maintain precise rod alignment during engine operation. This component ensures the flexible rod can transmit force or motion reliably, especially in systems where accurate movement is critical, such as fuel injection or lubrication control. Manufactured from resilient, wear-resistant material, the spring plate enhances both operational stability and service life of connected parts.

The threaded pin marked as code K 72148 serves as a key fastening and pivot element for the levers K 72127 and K 72130 in the Sulzer ZV40/48 engine. Designed for strength and precise alignment, this pin ensures secure and smooth articulation of the lever mechanisms involved in actuation or control systems. Its threaded design allows for tight, vibration-resistant assembly, contributing to long-term mechanical stability and accurate system function under dynamic load conditions. This small component plays a big role in maintaining engine control integrity.

The filter with code number K 72301 is a vital part of the Sulzer ZV40/48 diesel engine's cylinder lubrication system. It ensures that lubricating oil delivered to the cylinder walls and piston rings remains clean and free from contaminants. By capturing debris and impurities before they reach critical components, this filter significantly reduces wear and tear, enhancing engine reliability and efficiency. Regular maintenance and timely replacement of the filter are crucial to preserving the integrity of the lubrication circuit and avoiding costly damage in marine or industrial operations.

The air starter provides a reliable and efficient method to initiate the MAN L21/31 engine. Using compressed air to turn the engine over, this starter ensures quick and safe engine starts without the need for electrical systems. Its robust design is particularly suited to heavy-duty and marine environments, contributing to dependable engine operation and reduced downtime.

The turning gear operating at 3 x 440V is an essential component for the MAN L21/31 engine’s maintenance and safety. It allows controlled rotation of the engine during start-up and shutdown procedures, preventing shaft distortion and uneven wear. This gear ensures smooth engine positioning, facilitating inspection, servicing, and prolonging the engine’s operational life, especially in demanding industrial applications.

The cylinder head complete, combined with the fuel injection valves, forms a crucial assembly in the MAN L21/31 engine. The cylinder head seals the combustion chamber, housing the valves and injection system that ensure efficient fuel delivery and air flow. The fuel injection valves precisely meter fuel into the combustion chamber for optimal combustion, maximizing power output while minimizing emissions. This combination is vital for engine efficiency, performance, and longevity.

The locking ring identified by code K 72145 is used to secure the flexible rod K 72135 within the Sulzer ZV40/48 engine system. It holds the rod firmly in place, ensuring accurate alignment and preventing unintended movement during engine operation. This is particularly important in systems where mechanical stability and precision are critical, such as fuel or lubrication controls. Constructed to withstand mechanical stress and vibration, the locking ring supports both safety and reliability across extended engine service intervals.