Cylindrical pins with code EN1P1228 are precision alignment elements used throughout the MAN L21/31 engine to ensure the correct positioning of components such as casings, housings, and covers. Manufactured from hardened steel, these pins provide repeatable and stable assembly, reducing mechanical wear and improving servicing accuracy. Their role in maintaining geometric consistency across critical joints makes them vital for the long-term mechanical stability of the engine.

The cap nut M33x2, bearing code 11.01296-0071.A, is a specialized fastening component used in conjunction with tie rods or studs in the MAN L21/31 engine. Its robust design allows it to sustain repeated tightening cycles and maintain a secure hold under vibration and thermal stress. Accurate torque application on the cap nut ensures a leak-free and vibration-resistant seal, making it a small yet indispensable part of engine reliability during long-term operation.

The tie rod with code 11.01295-0311.C is a critical structural component in the MAN L21/31 engine, used to securely fasten the cylinder head to the engine block. Designed to endure extreme mechanical loads and thermal expansion, the tie rod ensures uniform clamping force across the combustion chamber. Its high-tensile steel construction and precise machining are essential for maintaining engine integrity, reducing distortion, and preventing leaks during high-pressure operation—especially vital in marine and power generation applications.

The upper part of the piston, code K 34101, forms the crown of the operating piston in the Sulzer ZV40/48 engine. Exposed to intense heat and pressure, it is key to combustion performance and durability. Its design supports optimal fuel burn and thermal management, directly influencing power output and longevity.

The bolt marked with code number K 33400 is a high-strength fastener designed to secure the connecting rod shaft in the Sulzer ZV40/48 diesel engine. This component must withstand extreme mechanical stress, especially during high-speed rotation and combustion cycles. It ensures structural integrity and prevents engine failure through tight and durable connection.

The lower bearing half, code number K 33220, is an essential support component in the Sulzer ZV40/48 engine's crankshaft assembly. It is specifically engineered to absorb and distribute dynamic loads exerted by the rotating crankshaft, ensuring smooth operation and minimal friction. Manufactured from high-strength, wear-resistant materials, this bearing half plays a critical role in maintaining engine efficiency, longevity, and vibration stability under high-load conditions.

The guide bearing cap, code 11.01254-0169.A, is a precision-fitted component used to secure and guide the motion of critical engine elements such as the camshaft or auxiliary shafts within the MAN L21/31 engine. By stabilizing axial and radial movement, the guide bearing cap contributes to smooth engine timing and mechanical efficiency. Its durable design helps reduce wear, misalignment, and mechanical failure over time, especially in applications involving sustained operational loads.

The quality specification document, code 10.09412-3021-1.0, outlines the rigorous manufacturing and inspection standards for the MAN L21/31 engine. This specification ensures that all components, from castings to precision-machined parts, meet strict criteria for material integrity, dimensional accuracy, and performance reliability. It serves as a critical reference for OEMs, maintenance teams, and suppliers to guarantee consistent quality throughout the engine’s lifecycle and to uphold MAN Diesel's global reputation for engineering excellence.

The main bearing cap with code 11.01254-0168-1.B is a structural cornerstone of the MAN L21/31 engine, designed to securely hold the crankshaft's main bearings in place. Subjected to tremendous mechanical forces, this component ensures that the rotating crankshaft remains perfectly aligned during engine operation. Precision-machined and built to withstand stress, the main bearing cap plays a vital role in maintaining engine balance, minimizing vibration, and extending the lifespan of internal components in high-load marine or industrial environments.

The oil filling eye coded K 32379 is a functional element designed to facilitate easy and clean oil replenishment for the barring engine in the Sulzer ZV40/48 system. Typically located in an accessible position, it acts as both an entry point for lubrication oil and a visual inspection aid to monitor oil levels. Its presence ensures that the barring engine remains properly lubricated, minimizing wear on moving parts and contributing to the reliability and longevity of the entire mechanism.