This manual covers the MAN Industrial Diesel Engine series, specifically models D2530 ME/MTE, D2540 MTE/MLE, D2840 ME/LE, D2542 ME/MTE/MLE, and D2842 ME/LE. These engines are engineered for robust industrial applications, featuring advanced diesel technology, liquid cooling, and forced lubrication systems. Their design emphasizes reliability and performance, making them suitable for demanding operational environments. The comprehensive nature of these engines, with varying displacements and configurations, ensures they meet a wide range of industrial power requirements. The purpose of this Service Repair Manual is to provide detailed instructions and information necessary for the maintenance, repair, and troubleshooting of the specified MAN Industrial Diesel Engines. It includes procedures for checking, controlling, and adjusting various systems such as the fuel, cooling, lubrication, intake, exhaust, and electrical equipment. The manual offers top-quality diagrams and instructions for components including the cylinder head, crankshaft, pistons, and compressor, empowering owners and technicians to perform necessary tasks efficiently and confidently.