This document pertains to the Mercury Mariner, an outboard engine designed for marine propulsion. It is a water-cooled, gasoline-powered unit with a 2.5 HP output, featuring a carburetor for fuel delivery and an outboard lower unit transmission. The engineering quality and reliability of Mercury outboards are well-established, making the Mariner a dependable choice for various boating applications. This Factory Service Repair Manual provides comprehensive guidance for the maintenance and repair of the Mercury Mariner. It covers essential procedures, technical specifications, and troubleshooting information necessary for optimal performance and longevity. Owners, mechanics, and technicians will find detailed instructions on servicing, lubrication, and system diagnostics, ensuring the engine remains in peak operating condition.