This service manual covers the David Brown AD4-25 Diesel Engine. It provides comprehensive information for servicing and repairing this specific engine model. The manual is designed to detail the engineering and operational aspects of the David Brown AD4-25, ensuring its continued performance and reliability. The scope of this manual encompasses all necessary service and repair procedures. It is intended to be a definitive resource for owners, mechanics, and technicians, offering detailed guidance on maintenance, troubleshooting, and technical specifications. By following the instructions within this manual, users can effectively maintain and repair the David Brown AD4-25 Diesel Engine.