This manual covers the US Marine Power Inboards and the HINO RB145 Series Bus, specifically detailing the W04D 4.009L and W04C-T 3.839L diesel engines. These engines are 4-cycle, 4-cylinder, in-line, water-cooled, direct injection units, with the W04C-T featuring turbocharging. The LE05S series transmission is also addressed, offering 5 forward and 1 reverse gear with synchromesh for gears 2 through 5, and constant mesh for 1st and reverse. This comprehensive coverage ensures detailed information for these robust marine and bus applications. The purpose of this manual is to provide essential information for the maintenance, repair, and troubleshooting of the covered vehicles and their components. It includes detailed sections on the engine system, turbocharger, fuel and lubrication systems, cooling system, and electrical equipment. Additionally, it covers the clutch, transmission, propeller shaft, axles, steering, braking systems, suspension, and chassis frame. This resource is designed to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the US Marine Power Inboards and HINO RB145 Series Bus.