This workshop service repair manual covers Mercury Mariner outboard engines manufactured between 1987 and 1993, offering power options of 100 and 115 horsepower. These water-cooled, carbureted engines feature a CDI ignition system and are designed for reliable performance. Transmission includes forward, neutral, and reverse gears, with steering and throttle controlled either remotely or via tiller. This comprehensive manual provides detailed information essential for the maintenance and repair of your Mercury Mariner outboard. It covers critical areas such as engine specifications, electrical systems, troubleshooting common issues related to ignition, fuel, and cooling, and essential maintenance procedures. This resource is designed to assist owners and technicians in ensuring the optimal performance and longevity of their vessel's propulsion system.