This workshop service repair manual covers Mercury Mariner JET outboard engines, all models and engines, designed for gasoline fuel and water-cooled operation. These 20 horsepower JET outboard engines provide reliable performance for various marine applications. Their robust engineering ensures durability and efficiency on the water, making them a trusted choice for boaters. This comprehensive English-language manual provides essential information for maintaining and repairing your Mercury Mariner JET outboard. It details service procedures, routine maintenance schedules, and troubleshooting guidance to ensure optimal performance and longevity. Owners, mechanics, and technicians will find the technical specifications and step-by-step instructions invaluable for keeping the engine in peak operating condition.