This workshop service repair manual provides comprehensive information for the Mercury Mariner Marathon 15 HP outboard engine. Designed for reliable performance, this water-cooled, carbureted engine delivers 15 horsepower and features a typical 2-cylinder configuration. Its robust construction and straightforward design make it a dependable choice for various marine applications. The outboard lower unit includes forward, neutral, and reverse gears, ensuring versatile operation on the water. This manual serves as an essential resource for owners, technicians, and mechanics. It details all aspects of maintenance, from routine service intervals and fluid capacities to in-depth troubleshooting procedures and technical specifications. With hundreds of pages of detailed instructions and diagrams, this English-language document is designed to help you understand, maintain, and repair your Mercury Mariner Marathon 15 HP engine, ensuring its longevity and optimal performance.