This service repair manual covers the Case David Brown AD4/25 and CAD4/30 four-cylinder diesel engines. These engines are designed for robust performance and reliability in demanding applications. With a displacement of 3.14 liters (191.6 cubic inches), they feature direct injection and a compression ratio of 17.5:1, operating at a rated speed of 2000 RPM. The engine specifications, including a bore of 91.5 mm and a stroke of 114.3 mm, highlight the precision engineering inherent in these Case David Brown power units.

This manual provides comprehensive guidance for the maintenance and repair of these engines. It details essential procedures, including lubrication requirements with a 7.5-liter oil capacity, and recommended service intervals for oil, fuel filter, and air filter changes. Information on the cooling system, including thermostat operation at 71°C, and the electrical system, featuring 12V starter and alternator, is also included. This factory-original English language manual is an indispensable resource for owners and technicians seeking to ensure the optimal performance and longevity of their AD4/25 and CAD4/30 engines.