This manual provides comprehensive information for Mercury Mariner Outboard models manufactured between 1984 and 2000. These outboards, known for their robust engineering and reliability, span a wide range of horsepower from 2.5HP to 275HP, incorporating various engine configurations including Inline 2-stroke, Inline 3-stroke, Inline 4-stroke, V4, and V6 designs. Engine displacement and specific features like fuel delivery systems (carbureted or EFI) and ignition types (CDI or Electronic) vary significantly across this broad spectrum of models and years, ensuring a suitable option for diverse boating needs. The purpose of this Factory Service Repair Manual is to offer detailed guidance for the maintenance, repair, and troubleshooting of your Mercury Mariner Outboard. It covers essential areas such as lubrication, cooling systems, spark plug specifications, electrical charging and starting systems, and propeller and trim/tilt functions. By providing precise technical specifications and step-by-step procedures, this manual serves as an indispensable resource for owners, mechanics, and technicians aiming to ensure the optimal performance and longevity of their Mercury Mariner Outboard.