This manual covers the Iveco NEF Engine, part of the NEF Series, with a production year of 2006. These internal combustion diesel engines are engineered for reliability and performance, with variants including the N45 MNA M10, featuring a 4.5-liter displacement, and the N67 MNA M15, with a 6.7-liter displacement. The NEF engine family is designed to meet diverse operational demands, reflecting Iveco's commitment to robust and efficient power solutions. This Technical and Repair Manual in English provides comprehensive information for maintaining and repairing the Iveco NEF Engine. It includes detailed sections on technical data, electrical equipment, diagnostics, maintenance, servicing operations, overhaul procedures, and safety regulations. The manual is an essential resource for owners, mechanics, and technicians, offering the necessary guidance to ensure the optimal performance and longevity of the engine.