This manual provides comprehensive service and repair information for the Hino W04D marine engine. Designed for both experienced mechanics and do-it-yourself enthusiasts, it offers detailed instructions to ensure the proper functioning and longevity of your engine. The Hino W04D marine engine is engineered for reliability, and this manual serves as your primary resource for maintaining its performance and addressing any issues that may arise. The scope of this manual covers all essential aspects of Hino W04D marine engine maintenance and repair. It includes detailed procedures for engine identification, general precautions, disassembly and assembly, maintenance checklists, and specific checks and maintenance routines. Furthermore, it delves into the fuel system, cooling system, exhaust system, electrical system, and troubleshooting guides, all supported by servicing specifications, tightening torques, and wiring diagrams. This resource is invaluable for anyone needing to diagnose, repair, or maintain their Hino W04D marine engine.