This shop service manual covers the Iveco NEF N40-ENT-M25, N60-ENT-M37, and N60-ENT-M40 internal combustion engines. These engines are engineered for reliability and performance, making them a robust choice for various applications. This manual provides comprehensive information essential for the service and repair of these specific engine models. The purpose of this manual is to serve as a definitive guide for maintaining and repairing your Iveco engine. It includes detailed sections on general information, engine mechanical components, fuel, exhaust, cooling, lubrication, electrical, intake, and preheating systems. With step-by-step instructions, diagrams, and illustrations, this English language manual is designed to assist owners, mechanics, and technicians in performing all necessary service procedures accurately and efficiently.