This workshop service repair manual covers the Iveco NEF Tier 3 Series N45 and N67 ENT engines. Manufactured by Iveco Motors, these engines are designed for robust performance and reliability in various applications. The NEF engine family, including the N45 and N67 variants, is engineered to meet stringent Tier 3 emission standards. This manual provides comprehensive information essential for understanding and maintaining these powerful engines. The purpose of this manual is to serve as a definitive guide for the service and repair of the specified Iveco engines. It details critical aspects such as general specifications, fuel systems, industrial applications, overhaul procedures, and technical data. Additionally, it includes essential safety prescriptions and information on specialized tools. By following the procedures outlined within, owners and technicians can ensure optimal performance, longevity, and cost-effective maintenance of their Iveco NEF engines.