This workshop service repair manual provides comprehensive information for the Mercury Mariner Marathon outboard motor, covering a range of production years. Designed for reliability and performance, this 10 HP engine is a testament to Mercury's engineering quality. Its water-cooled system and likely carbureted fuel system ensure efficient operation, while the outboard gearcase with forward, neutral, and reverse gears offers versatile control. Whether for recreational boating or professional use, understanding and maintaining this engine is key to its longevity. This manual is your definitive guide to the Mercury Mariner Marathon. It details essential maintenance procedures, including lubrication and fuel requirements, alongside in-depth troubleshooting steps for various systems such as the engine, fuel, ignition, cooling, and electrical components. Technicians and owners will find detailed coverage of the powerhead, gearcase, and control systems, enabling effective upkeep and repair. With hundreds of pages of information in English, this printable resource is indispensable for ensuring your Mariner Marathon operates at peak performance.