This factory service repair manual covers the Iveco Nef Tier 3 Series N45 and N67 engines. These internal combustion engines are engineered for reliability and performance, adhering to Tier 3 emission standards. This manual is designed to provide comprehensive guidance for the service and repair of these specific Iveco engine models, ensuring their continued optimal operation. The purpose of this manual is to equip owners and professional technicians with the necessary information for effective maintenance and repair. It details step-by-step instructions for complete disassembly, supported by hundreds of photos and illustrations. Coverage includes all essential aspects of engine service, technical specifications, and troubleshooting, enabling both do-it-yourself enthusiasts and experienced mechanics to perform necessary work accurately and efficiently.