This workshop manual covers the Deutz BFM 1012 and BFM 1013 series engines, including models BF4M 1012, BF4M 1013, BF4M 1012 E, BF4M 1013 E, BF6M 1012, BF6M 1013, BF6M 1012 E, and BF6M 1013 E. These engines are known for their robust engineering and reliable performance, making them suitable for a wide range of demanding applications. This manual provides comprehensive information to ensure these engines operate at their peak efficiency. The purpose of this manual is to serve as a complete guide for the maintenance and repair of the BFM 1012/1013 series engines. It includes detailed sections on specification data, checking and adjusting procedures, repair of individual components, and the disassembly and re-assembly of the complete engine. Essential tools required for these tasks are also outlined. This resource is designed to assist owners, technicians, and mechanics in effectively servicing and maintaining these Deutz engines.