This workshop service manual covers the Iveco NEF engine series, also associated with New Holland applications. These diesel engines are designed for a variety of uses, including vehicles, agricultural machinery, and industrial equipment. The NEF engine family features both Mechanical Injection and Common Rail systems, with models such as the F4BE, F4CE, F4GE, F4AE, F4HE, and F4DE. Configurations include inline 4-cylinder and inline 6-cylinder designs, with displacements ranging from an estimated 3.2L to 6.8L. Most models are turbocharged, offering power outputs typically between 70 kW (95 hp) and over 150 kW (200 hp). The engines are liquid-cooled and designed to meet various emission standards depending on the model year and region. This comprehensive 788-page English-language digital manual provides detailed information essential for the maintenance and repair of the Iveco NEF engines. It covers critical areas including lubrication recommendations, oil capacity estimations, and types of filters (oil, fuel, air, and coolant). The manual also details service intervals, emission compliance information, and specific engine model examples. Its purpose is to serve as a definitive resource for owners, mechanics, and technicians, ensuring the optimal performance, longevity, and safe operation of these engines through accurate procedures and technical specifications.