This workshop service repair manual covers all models of the Mercury Mariner 20 HP outboard motor. Designed for reliable performance on the water, this gasoline-powered, water-cooled outboard motor delivers 20 horsepower. Its robust engineering ensures dependable operation for a variety of boating applications. This comprehensive manual provides detailed information for maintaining and repairing your Mercury Mariner 20 HP outboard motor. It includes in-depth procedures for the engine, fuel system, ignition system, cooling system, and lower unit, along with electrical system diagnostics and troubleshooting guidance. This resource is essential for ensuring optimal performance and longevity of your vessel's propulsion system.