This manual covers the Deutz 912 and 913 series engines, including models FL 912, B/FL 913/C, F3-6L 912, F3/4/6L 913, BF4/6L 913, and BF6L 913C. These engines are known for their robust engineering and reliability, designed for demanding applications where consistent performance is critical. This document provides comprehensive information to ensure these engines operate at their peak efficiency. The purpose of this workshop service repair manual is to equip owners, mechanics, and technicians with the knowledge necessary for the maintenance and repair of Deutz 912 and 913 engines. It details technical specifications, provides instructions for checking and adjusting components, outlines procedures for repairing individual parts, and guides through the complete disassembly and reassembly of the engine. Essential tools are also identified to facilitate these tasks.