This manual provides comprehensive service and repair information for the Hino RB145 W04D engine. Designed for reliability and performance, the Hino RB145 W04D engine is a key component in various applications, and this guide ensures its continued optimal function. It offers detailed instructions and specifications to support the maintenance and repair of this robust engine. The purpose of this manual is to equip owners, mechanics, and technicians with the knowledge necessary to perform all aspects of engine maintenance and repair. It covers essential areas including engine identification, general precautions, maintenance checklists, specific checks and maintenance procedures, special tools, engine body, fuel system, troubleshooting, servicing specifications, tightening torques, disassembly and servicing, cooling system, fuel filter, and the electrical system, including the alternator and regulator. Detailed illustrations, diagrams, and step-by-step instructions are provided to facilitate accurate diagnosis and repair.