This workshop manual covers the Deutz BFM 1012 and BFM 1013 series engines. It provides comprehensive technical information for the BF4M1012, BF4M1013, BF4M1012E, BF4M1013E, BF6M1012, BF6m1013, BF6M1012E, and BF6M1013E engine variants. These engines are known for their robust engineering and reliable performance, designed to meet demanding operational requirements across various applications. This manual serves as an essential resource for maintaining and repairing these Deutz engines. It details specification data, control and adjustment procedures, component repair, and the disassembly and re-assembly of complete engines. Specialized tools required for these tasks are also identified. This guide is intended for technicians and owners seeking to ensure optimal engine function and longevity.