This manual covers Mercury Mariner Outboard motors manufactured between 1965 and 1989, encompassing a range of power outputs from 2HP to 40HP across multiple generations. These outboards are known for their robust construction and reliable performance, making them a popular choice for various boating applications. The engineering quality inherent in these engines ensures durability and consistent operation when properly maintained. This comprehensive factory service and repair manual provides detailed information for owners, mechanics, and technicians. It includes essential maintenance procedures, troubleshooting guides, technical specifications, and safety guidelines necessary for the upkeep and repair of your Mercury Mariner Outboard. Coverage extends to all major systems, including the powerhead, lower unit, electrical components, fuel system, and controls, ensuring you have the knowledge to keep your engine running efficiently.