This service manual covers the Hino W04D marine engine, designed for robust performance and reliability in marine applications. The Hino W04D is engineered for efficiency and durability, making it a dependable choice for various marine power needs. This manual provides comprehensive information to ensure the optimal operation and longevity of your engine. This manual serves as a complete guide for maintaining and repairing the Hino W04D marine engine. It includes detailed procedures for disassembly and assembly, engine identification, general precautions, maintenance checklists, and specific system overhauls such as the fuel, cooling, and exhaust systems. Additionally, it offers troubleshooting guidance, servicing specifications, tightening torques, and electrical system information, including wiring diagrams, to assist owners and technicians in performing all necessary service and repair tasks.