This workshop service repair manual covers the Mercury Mariner, a versatile outboard motor designed for a range of boating applications. While specific production years are not detailed, this manual addresses models featuring a 4-stroke engine configuration, delivering 9.9 horsepower. The engine typically utilizes a carburetor for fuel induction and is water-cooled, ensuring efficient operation. Its outboard lower unit provides forward, neutral, and reverse gear selection, with varying shaft lengths and weights to suit different vessel types. The engineering of the Mercury Mariner focuses on reliable performance and durability, making it a trusted choice for recreational and professional use. This comprehensive English-language manual is an essential resource for maintaining and repairing your Mercury Mariner. It provides detailed instructions for scheduled maintenance, including oil change intervals, lubrication procedures for the gearcase and engine, and specifications for spark plugs. The manual also offers in-depth troubleshooting guidance for common issues such as starting problems, overheating, fuel delivery concerns, and electrical system diagnostics, including details on the CDI ignition system. By following the procedures outlined within, owners and technicians can ensure optimal performance, longevity, and safety of the Mercury Mariner.