This manual covers Mercury Mariner outboard engines with horsepower ratings of 6 HP, 8 HP, 9.9 HP, 10 HP, and 15 HP. These gasoline-powered, water-cooled outboard engines are designed for marine propulsion and are known for their reliability and robust engineering. The specific model years are not detailed, but the content spans a range of these horsepower configurations, including specialized variants like Sailmate and Sailpower. This Factory Service Manual provides comprehensive repair and maintenance information for the specified Mercury Mariner outboard models. It details essential procedures, technical specifications, and troubleshooting guidance necessary for proper upkeep and repair. Owners, mechanics, and technicians will find the information invaluable for ensuring the optimal performance and longevity of their engines.