This workshop service manual provides comprehensive information for the David Brown Diesel Engine CAD4-30. Designed for reliability and robust performance, this engine is a testament to David Brown's engineering heritage. Its robust construction and efficient operation make it suitable for a variety of demanding applications, ensuring dependable power delivery in diverse operational environments. This manual serves as an essential resource for maintaining and repairing the David Brown Diesel Engine CAD4-30. It covers detailed procedures, technical specifications, and troubleshooting guidance necessary for optimal engine performance and longevity. Owners, technicians, and mechanics will find the enclosed information invaluable for routine maintenance, diagnostics, and complex repair tasks, ensuring the engine continues to operate at peak efficiency.