This service repair manual covers engines manufactured by CASE New Holland, KOBELCO, and ISUZU, specifically models 4BG1T, BB-4BG1T, 6BG1T, and BB-6BG1T. These engines are designed for robust performance and reliability, making them suitable for a wide range of industrial and heavy-duty applications. The manual provides comprehensive technical information to ensure these engines operate at peak efficiency and longevity. The purpose of this English-language manual is to serve as a definitive guide for repair, servicing, technical maintenance, and troubleshooting. It includes detailed sections on general information, maintenance schedules, disassembly and reassembly procedures, and specific systems such as lubrication, cooling, and fuel. With real photo illustrations and step-by-step operations, this 175-page manual is an essential resource for owners, mechanics, and technicians seeking to maintain and repair these ISUZU engines effectively.