This workshop manual provides comprehensive technical information for Deutz BFM 2012 diesel engines, specifically covering the BF4M 2012, BF4M 2012 C, and BF6M 2012 C engine types. Designed for professional use, this manual details essential engineering and operational aspects of these robust engines, ensuring their continued reliability and performance. Its thorough content aims to support users in understanding and managing the complexities of these Deutz power units. The scope of this manual is extensive, encompassing detailed forewords, general information, user notes including safety regulations and disposal guidelines, and operational instructions. It further provides critical technical data, testing and setting parameters, tightening specifications, and an overview of job cards. A significant portion is dedicated to detailed job cards, alongside information on commercial and special tools required for maintenance and repair. This resource is intended to be an indispensable guide for owners, mechanics, and technicians.