This workshop service repair manual covers various Mercury Mariner Outboard models, encompassing early to mid-production series. These 2-stroke outboard engines, available in 6, 8, 9.9, 10, and 15 HP variants, are designed for reliable marine propulsion. They feature water-cooling systems, carbureted fuel delivery, and CDI ignition for efficient operation. The engines typically utilize reed valves for induction and exhaust through the propeller hub, with cylinder configurations varying by horsepower. This manual provides comprehensive information for maintaining and servicing these dependable marine power units. The purpose of this English-language manual is to serve as a definitive guide for owners, mechanics, and technicians. It details essential maintenance procedures, troubleshooting techniques, technical specifications, and safety guidelines specific to the Mercury Mariner Outboard engines. Covered topics include lubrication requirements, recommended fuel and oil types, ignition system details, and component replacement intervals, such as the water pump impeller. By following the instructions within this manual, users can ensure optimal performance, longevity, and safe operation of their Mercury Mariner Outboard.