This workshop service manual covers the Mercury Mariner outboard engine, featuring a 50 HP power output. It is equipped with an inline 3-cylinder configuration, a 747cc (45.6 cu. in.) displacement, and a fuel injection system. The engine utilizes a CDI ignition system and is water-cooled. Designed for reliable performance, this engine is built with quality engineering for various marine applications. This comprehensive manual provides detailed information essential for the maintenance and repair of your Mercury Mariner engine. It includes sections on technical specifications, routine maintenance procedures, lubrication requirements, and troubleshooting guidance. By following the instructions within this manual, owners and technicians can ensure optimal performance, longevity, and safe operation of the 50 HP Mariner outboard.