This workshop service repair manual provides comprehensive information for the Hino W04C-T marine engine. Designed for both do-it-yourself enthusiasts and experienced mechanics, this manual offers an economical approach to maintaining your engine's optimal performance. It details procedures based on complete disassembly, guiding users through every step with extensive photos and illustrations, ensuring a thorough understanding of service and repair processes for this robust marine engine. The scope of this manual encompasses all essential aspects of Hino W04C-T marine engine maintenance and repair. It includes detailed sections on engine identification, general precautions, disassembly and assembly, maintenance checklists, special tools, engine body, fuel system, cooling system, exhaust system, fuel filter, and the electrical system, including the alternator, regulator, and wiring diagrams. Furthermore, it provides troubleshooting guides, servicing specifications, and tightening torques, equipping users with the knowledge to diagnose and resolve issues efficiently.