This workshop service manual covers the Mercury Mariner outboard engine. Designed for marine applications, this engine features a 20 HP gasoline-powered, water-cooled, spark ignition system. Its robust construction and reliable performance make it a suitable choice for a variety of boating needs. This comprehensive manual provides detailed instructions and specifications for the maintenance, repair, and overhaul of the Mercury Mariner outboard engine. It includes information on engine specifications, lubrication, service schedules, and troubleshooting guidance. This resource is intended for technicians fully conversant with general automobile practices, enabling them to effectively maintain and repair the vehicle.