The self-locking nut K 31026 is engineered to provide secure fastening even under conditions of vibration and thermal cycling. Used in the mounting of components K 31024 and K 31520, this nut ensures the reliability of threaded joints, reducing the risk of loosening during operation.

The spring plate with code number K 31027 is a crucial mechanical element used to ensure proper tension and load distribution between components K 31024 and K 31520. It helps stabilize the assembly and absorb shocks, which is especially important in high-vibration environments such as large diesel engines.

The PS (power supply or pump set) for the hydraulic tie rod, code 0743814-5.0, is a specialized system that provides the required hydraulic pressure to operate the tie rod mechanism in the MAN L21/31 engine. Hydraulic tie rods ensure uniform pre-tensioning of cylinder heads, promoting even load distribution and structural stability. The power supply unit is vital for maintaining the precision and reliability of the hydraulic tightening process, especially during engine installation or overhaul.

The tightening instruction document, code 11.00160-0152-1.K, is an essential reference for proper torque application on the MAN L21/31 engine. This technical guide specifies torque values, sequences, and procedures for securing bolts, nuts, and other fasteners across engine components. Adhering to these instructions is vital for preventing uneven loads, avoiding mechanical failure, and ensuring optimal sealing and performance during assembly or maintenance.

The cylinder crankcase, code 11.01200-3593-1.H, is a core structural component of the MAN L21/31 engine, housing and supporting key moving parts such as the crankshaft and cylinders. Built to withstand internal pressures and mechanical stress, the crankcase ensures precise alignment and rigid support for all rotating assemblies. Its robust cast design plays a crucial role in the engine's strength, vibration dampening, and overall operational integrity, especially under continuous marine or power generation workloads.

The drive shaft with code K 32321 is a key transmission component that transfers torque to the vertical worm gear in the Sulzer ZV40/48 engine. This shaft must withstand high torsional loads and deliver consistent power with minimal backlash. Crafted from robust materials and manufactured with high precision, it ensures reliable operation of the worm gear mechanism, which may be part of engine barring or auxiliary drive systems. Its performance directly impacts the efficiency and durability of critical drivetrain assemblies.

The housing cover identified by code K 32315 is designed to enclose and protect the pinion shaft assembly within the Sulzer ZV40/48 engine. This cover plays a critical role in shielding internal components from contaminants, retaining lubricants, and ensuring the mechanical integrity of the pinion system. Its precise fitment supports the proper alignment of rotating parts, reducing wear and vibration. A reliable housing cover like this is key to preserving gearbox efficiency and minimizing maintenance downtime.

The bush coded K 28008 is a vital wear-resistant insert used in the Sulzer ZV40/48 diesel engine's main rocker arm (K 28005). This component serves as a bearing surface, allowing the rocker arm to pivot smoothly with minimal friction while maintaining precise valve timing under high load conditions. Engineered for durability, the bush absorbs stress and reduces wear on the rocker arm, significantly extending the engine’s service life. Regular inspection and lubrication of this part are essential to ensure efficient valve actuation and overall engine performance.

The engine frame, code D51101-06.0, serves as the structural backbone of the MAN L21/31 engine. It houses and supports the core components such as the crankshaft, camshaft, and cylinder block, ensuring proper alignment and load distribution. Built for high strength and long service life, the engine frame plays a critical role in maintaining the integrity and vibration resistance of the engine, especially in demanding marine propulsion or power generation environments.

The torque wrench, code 08.06411-0021.0, is a vital instrument in the toolkit for maintaining MAN L21/31 engines. Used to apply precise torque to bolts and nuts, this tool helps prevent overtightening or under-tightening, both of which can lead to engine damage or failure. Accurate torque application ensures optimal sealing, component lifespan, and safe engine operation, making the torque wrench indispensable for high-performance marine and industrial engine servicing.