This Service and Repair Manual covers CNH engines from the NEF family, specifically engine models F4HE, F4CE, F4DE, and F4GE. These are 6-cylinder, Tier 3 diesel engines, featuring turbocharged and direct injection combustion systems. While specific displacement, power, and torque figures vary by model variant, these engines are engineered for robust performance and reliability in demanding applications. The manual provides essential information for understanding and maintaining these powerful and efficient powerplants. The purpose of this English-language Service and Repair Manual is to provide comprehensive guidance for the maintenance, troubleshooting, disassembly, and assembly of CNH NEF series engines. It is designed for both do-it-yourself mechanics and experienced technicians, offering detailed instructions supported by high-quality diagrams, exploded views, and illustrations. This manual serves as an indispensable resource for ensuring the optimal performance, longevity, and proper functioning of your CNH engine.