This manual pertains to the Hino W04C-TI Marine Engine, a robust and reliable component designed for marine applications. Engineered for quality and performance, the W04C-TI model represents Hino's commitment to providing dependable power solutions. This service manual is intended to assist users in understanding and maintaining the full capabilities of their marine engine, ensuring its optimal operation and longevity. The purpose of this comprehensive service manual is to provide detailed instructions for the maintenance, diagnosis, and repair of the Hino W04C-TI Marine Engine. It covers a wide range of topics, including routine servicing, tune-ups, removal and installation procedures, and in-depth repair of various systems such as fuel, ignition, lubrication, exhaust, and electrical. The manual emphasizes safety precautions and the use of specialized tools, empowering owners and technicians to perform necessary work effectively and efficiently, thereby maintaining the engine's peak performance and reliability.