This manual provides comprehensive service and repair information for the Hino RB145 W04D W04C engine. Designed for both DIY enthusiasts and professional mechanics, it details every aspect of the engine, from initial identification and general precautions to in-depth disassembly and assembly procedures. The manual highlights the engineering quality and reliability inherent in the Hino RB145 W04D W04C engine, offering extensive guidance to ensure its optimal performance and longevity. The scope of this workshop service repair manual is extensive, covering critical areas such as engine body, fuel system, cooling system, exhaust system, and electrical system components including the alternator and regulator. It features detailed maintenance checklists, special tool requirements, and servicing specifications, including tightening torques. Furthermore, the manual includes a dedicated troubleshooting section and wiring diagrams, empowering users to efficiently diagnose and resolve issues, thereby maintaining the vehicle’s operational integrity.