This manual covers the Case David Brown AD4 Series Diesel Engines, specifically the AD4 25 and CAD4 30 models. These four-cylinder diesel engines, produced from the mid-1960s to the late 1970s, were a robust and reliable component in many agricultural machines. Known for their durability and straightforward design, they powered popular David Brown tractor models. The AD4 series engines are characterized by their solid construction, designed to provide dependable performance in demanding agricultural environments.

This comprehensive workshop service and repair manual provides detailed information for the maintenance, troubleshooting, and repair of the Case David Brown AD4 25 and CAD4 30 Series Diesel Engines. It includes in-depth procedures for engine mechanical systems, fuel systems, lubrication, cooling, starting, and exhaust systems. Coverage extends to disassembly, assembly, routine maintenance, diagnostic charts for common issues, and complete engine overhaul procedures, making it an essential resource for mechanics, technicians, and owners seeking to maintain and repair these engines.