This manual covers the David Brown CAD4-30 Diesel Engine, a robust and reliable power unit designed for demanding applications. Engineered for durability and consistent performance, this engine is a testament to David Brown's commitment to quality. Its design prioritizes efficiency and longevity, making it a trusted choice for various industrial and agricultural uses where dependable operation is paramount. The purpose of this Factory Service Repair Manual is to provide comprehensive guidance for the maintenance, repair, and servicing of the David Brown CAD4-30 Diesel Engine. It includes detailed procedures, technical specifications, and troubleshooting information essential for ensuring the optimal performance and longevity of the engine. This manual is an indispensable resource for owners, technicians, and mechanics seeking to understand and maintain this engine effectively.