This workshop service manual covers the MTU 4000 Series engines. These V-Type Diesel engines are engineered with robust construction, featuring 12 or 16 cylinders at a 90-degree angle. With displacements of 48.7 liters for the 12-cylinder configuration and 65.0 liters for the 16-cylinder version, they are designed for demanding applications. The engines incorporate advanced systems including high and low-pressure fuel systems, comprehensive cooling and lubrication, and integrated turbocharging, intake, exhaust, starting, monitoring, and regulating systems. The purpose of this manual is to provide comprehensive technical information for the maintenance and repair of the MTU 4000 Series engines. It details general information, safety precautions, specifications, and covers a wide range of procedures including engine condition checks, disassembly, assembly, run-in, installation, and operation. Specific sections address the removal, disassembly, inspection, repair, and assembly of key components such as the crankcase, cylinder liner, oil pan, gear case, pistons, conrods, camshaft, valve gear, fuel systems, turbocharger, and various other engine systems. This manual is an essential resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the engine.