This manual covers the Mercury Mariner 80 HP 3 Cylinder Outboard, produced between 1987 and 1993. Engineered for reliability and performance, this outboard motor features a robust 3-cylinder configuration delivering 80 horsepower. Its design emphasizes durability for demanding marine applications. This comprehensive guide is intended to provide all necessary information for understanding and maintaining this specific model. The purpose of this Factory Service Repair Manual is to assist owners, technicians, and mechanics in the proper maintenance, repair, and troubleshooting of the Mercury Mariner 80 HP 3 Cylinder Outboard. It includes detailed step-by-step repair procedures with illustrations, information on engine specifications, fuel system, ignition system, oil injection, battery charging, starting system, and detailed wiring diagrams. An advanced troubleshooting guide is also provided to help diagnose and resolve issues efficiently, ensuring the longevity and optimal performance of your outboard.