This workshop service repair manual covers the Iveco NEF Engine N40 ENT M25, an internal combustion engine designed for reliability and performance. Engineered with precision, this engine is built to meet demanding operational requirements, reflecting Iveco's commitment to quality and durability in its product offerings. Its robust construction and advanced design ensure efficient power delivery and longevity, making it a trusted component for various applications. This comprehensive English-language manual provides complete official factory service and repair information for all styles of the NEF Engine N40 ENT M25. It is designed for both do-it-yourself enthusiasts and experienced mechanics, offering step-by-step instructions, hundreds of detailed photos and illustrations, and troubleshooting guidance, including electrical service procedures with wiring diagrams. The manual features a numbered table of contents for easy navigation and includes notes, cautions, and warnings to ensure safe and effective maintenance and repair.