This service repair manual covers the Mercury Mariner Marathon, a 10 HP outboard engine from the Marathon Series. Engineered for reliability and performance, this water-cooled, gasoline-powered outboard utilizes a CDI ignition system and a manual starting mechanism. Its robust construction and straightforward design make it a dependable choice for various marine applications. This comprehensive manual provides essential information for the maintenance and repair of your Mercury Mariner Marathon outboard. It details crucial procedures, technical specifications, and troubleshooting guidance. Owners, mechanics, and technicians will find instructions on lubrication, scheduled maintenance intervals for components like spark plugs and fuel filters, and gearcase oil changes, ensuring optimal performance and longevity of the unit.