This workshop service repair manual covers Deutz Engines, specifically the FL 912, B/FL 913/C series, including models F3-6L 912, F3/4/6L 913, BF4/6L 913, and BF6L 913C. These engines are recognized for their robust engineering and reliability, making them suitable for a wide range of industrial and heavy-duty applications. This manual provides comprehensive information to ensure these engines operate at peak performance. The purpose of this manual is to equip owners, amateur mechanics, and professional technicians with the necessary knowledge for proper maintenance and repair. It details essential procedures such as checking and adjusting components, repairing individual parts, and the complete disassembly and reassembly of the engine. Included are technical specifications, a key to symbols, and information on required tools, all presented in an easy-to-understand format to facilitate correct execution of all tasks and prevent premature failures.