This manual pertains to the Deutz Engine BF4M 1012 E, a robust and reliable engine designed for demanding applications. Engineered for durability and performance, the BF4M 1012 E is a testament to Deutz's commitment to quality. Its advanced design ensures efficient operation and longevity, making it a preferred choice for various industrial and commercial uses. This engine's inherent reliability minimizes downtime and operational costs, providing a dependable power solution. The purpose of this comprehensive service repair workshop manual is to provide detailed instructions for the maintenance, diagnosis, and repair of the Deutz Engine BF4M 1012 E. It is intended for use by mechanics, technicians, and owners with basic mechanical knowledge. The manual covers all essential aspects, including engine identification, general precautions, maintenance checklists, detailed procedures for checking and maintaining various systems such as the engine body, fuel system, cooling system, and electrical system. It also includes troubleshooting guides, special tools, servicing specifications, tightening torques, and disassembly and servicing instructions, all presented with clear text, diagrams, illustrations, and wiring schematics to facilitate accurate and efficient work.