This manual covers FPT Iveco diesel engines, including the N45 ENT, N67 ENT, N40 ENT, N60 ENT, and S30 ENT models. These 4-stroke diesel engines are designed for industrial, agricultural, and power generation applications, meeting Tier 3 emission standards. They feature advanced aspiration systems, with turbocharged and intercooled variants for the N45 and N67, and supercharged and intercooled variants for the N40, N60, and S30. Engine displacements range from 3.0L to 6.7L, with cylinder counts of 4 or 6, reflecting robust engineering for demanding operational environments. This Workshop Service Repair Manual provides comprehensive guidance for the maintenance and repair of FPT Iveco diesel engines. It includes detailed step-by-step procedures, exploded views, and information on special tools required for service. The manual is designed to assist owners, mechanics, and technicians in understanding engine specifications, performing routine maintenance, and troubleshooting issues to ensure optimal performance and longevity of the equipment.