This manual provides comprehensive service, maintenance, and troubleshooting information for the Hino RB145 W04D W04C engine, covering all models, engine types, trim levels, and transmission types. Engineered for reliability and optimal performance, the Hino RB145 W04D W04C engine is a testament to Hino's commitment to quality. This document serves as the definitive resource for understanding and maintaining this robust engine. The scope of this workshop repair service manual is extensive, encompassing detailed procedures for engine identification, general precautions, maintenance checklists, and specific checks and maintenance routines. It includes essential information on special tools, engine body components, fuel system, cooling system, electrical system, alternator, and regulator. Furthermore, the manual offers in-depth troubleshooting guides, servicing specifications, tightening torques, and disassembly and servicing instructions, ensuring that owners and technicians have all the necessary resources for effective repair and upkeep.