The Mercury Mariner 20 JET 20, produced in model year 20, represents a robust outboard engine designed for reliable performance. This water-cooled, carbureted unit delivers 20 horsepower and features a CDI ignition system. Its outboard gearcase with F-N-R shift sequence is engineered for durability, and it offers various shaft length options to suit different vessel requirements. The Mariner 20 JET 20 is built with a focus on dependable operation and ease of use for a variety of marine applications. This Workshop Service Repair Manual provides comprehensive documentation in English for the Mercury Mariner 20 JET 20. It covers essential maintenance procedures, including recommended lubrication for the powerhead and gearcase, as well as service schedules for initial and periodic maintenance. The manual details technical specifications, troubleshooting guidance, and safety information crucial for owners, mechanics, and technicians. Its complete official factory content ensures accurate and thorough support for maintaining and repairing this outboard engine.