This manual covers Case IH engines, including the D-358, D466, DT466B, DT466C, DTI-466C, 6-830, and 6-590 series. These diesel engines are known for their robust construction and reliability, making them suitable for demanding applications such as tractors, agricultural equipment, construction machinery, and industrial vehicles. The various engine displacements, ranging from 358 cubic inches (5.86 L) to 830 cubic inches (13.6 L), offer a wide spectrum of power outputs, typically from 70 HP to over 250 HP, depending on the specific model and configuration. This comprehensive Repair Service Manual provides essential information for the maintenance and repair of these Case IH engines. It details critical procedures, technical specifications, and troubleshooting guidance necessary for optimal performance and longevity. The manual is designed to assist owners, mechanics, and technicians in understanding and performing tasks such as fluid capacity checks, oil changes, and other scheduled maintenance. With 961 pages of detailed instructions in English, this workshop manual serves as an authoritative resource for all service-related needs.