This comprehensive service repair manual covers the David Brown Diesel Engine AD4-25. Designed for robust performance and reliability, this engine is engineered to meet demanding operational requirements. Its construction emphasizes durability and efficiency, making it a dependable choice for various applications where consistent power output is essential. The AD4-25 represents a commitment to quality engineering, providing users with a powerful and enduring solution. The purpose of this manual is to provide detailed information for the service and repair of the David Brown Diesel Engine AD4-25. It includes essential procedures, technical specifications, and guidance to ensure the engine operates at its peak performance. Owners, technicians, and mechanics can utilize this resource to perform maintenance, diagnose issues, and carry out repairs effectively, thereby extending the lifespan and maintaining the operational integrity of the engine.