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 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 cylinder crankcase, code 11.01203-1644.C, is one of the most fundamental components in the MAN L21/31 engine. It serves as the foundation for the crankshaft and cylinder assemblies, ensuring structural rigidity and alignment. Engineered to withstand high thermal and mechanical loads, the crankcase supports efficient power transmission and vibration control. Its design ensures the entire engine structure maintains stability, making it vital for long-term performance in both marine and stationary installations.

The tightening instruction document, code 11.00160-0152-1.K, provides vital specifications for torque application on critical bolts and fasteners throughout the MAN L21/31 engine. This guide ensures correct tightening sequences and torque values are followed during assembly and maintenance. Precise adherence helps prevent mechanical deformation, seal failures, and structural imbalance, ultimately safeguarding the performance and reliability of the engine under demanding operating conditions.

The measuring points, code FK0831.0, play a crucial role in the routine monitoring and diagnostics of the MAN L21/31 engine. Strategically located across the engine’s mechanical system, these points allow technicians to gather essential data such as temperature, pressure, vibration, or wear indicators during operation. By facilitating early detection of irregularities, these measuring points contribute to preventative maintenance, reduced downtime, and extended engine life, making them indispensable in marine and industrial applications.

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.