This workshop service manual covers the David Brown Diesel Engine AD4-25. It is designed to provide comprehensive information for the maintenance and repair of this specific engine model. The manual details its engineering, intended applications, and the quality associated with its construction, aiming to ensure optimal performance and longevity for users. The scope of this manual encompasses essential maintenance procedures, troubleshooting guides, detailed technical specifications, and critical safety guidelines. Its purpose is to serve as an authoritative resource for owners, mechanics, and technicians, enabling them to effectively maintain, diagnose, and repair the David Brown Diesel Engine AD4-25. By following the instructions within, users can ensure the continued reliable operation of their equipment.