This manual covers the DEUTZ TD/TCD 2012 L04/06 2V/m and TCD 2013 L04/06 2V/m Engine series. These engines are engineered for robust performance and reliability, designed to meet demanding operational requirements. This comprehensive guide ensures that operators and maintenance personnel can achieve optimal efficiency and longevity from their equipment through proper handling and upkeep. The purpose of this Operation & Maintenance Manual is to provide detailed procedures for the operation, handling, lubrication, maintenance, checking, and adjustment of the specified DEUTZ engines. It covers essential topics including general engine description, operating media, routine maintenance tasks, troubleshooting common faults, and transport and storage guidelines. The information contained herein is crucial for maintaining peak performance, ensuring economical operation, and promoting safe usage of the engine.