This manual covers the Case New Holland 667TA series of diesel engines, including variants such as 667TA/EEG, 667TA/EEC, 667TA/EBF, 667TA/EED, 667TA/EBJ, and 667TA/EDJ. These engines are designed for demanding applications and feature an improved generation with a High Pressure Electronic Injection System (Common Rail) and an EGR emissions system, compliant with Tier 3 (III) standards. The engineering quality and reliability of the Case New Holland 667TA series ensure robust performance for various industrial and agricultural needs. The purpose of this Factory Service Repair Workshop Manual is to provide comprehensive guidance for the maintenance, repair, and overhaul of the Case New Holland 667TA engines. It includes detailed procedures for engine lubrication, cooling, fuel supply, starter motor, and alternator systems. Furthermore, the manual offers in-depth information on engine overhaul, including specifications for crankshaft, cylinder head, valve gear, and electro-injector components. Troubleshooting guidance and diagnostic information, utilizing the CNH-EST Diagnostic Tool, are also thoroughly covered to assist owners and technicians in maintaining optimal engine performance and longevity.