This workshop repair manual covers Case Diesel Engines, specifically models 445/M2, 445T/M2, and 668T/M2. These engines are designed for robust performance and reliability, featuring a mechanical injection fuel system. This manual is an essential resource for understanding the engineering and operational intricacies of these powerful diesel units, ensuring their continued effectiveness in demanding applications. The purpose of this English-language manual is to provide comprehensive guidance for the repair and overhaul of the specified Case Diesel Engines. It details essential procedures, technical specifications, and maintenance schedules, including sections on general information, feed systems, engine overhaul, and installation guidelines. This document serves as an authoritative reference for owners, technicians, and mechanics to effectively maintain and repair these engines, ensuring optimal performance and longevity.