This workshop service repair manual covers Mercury Mariner 70, 75, 80, 90, 100, and 115 HP outboard engines for all model years. These engines are known for their robust construction and reliable performance, making them a popular choice for various marine applications. This manual provides in-depth information to ensure these outboards operate at their peak efficiency and longevity, addressing their water-cooled systems, fuel delivery mechanisms, and electronic ignition. This comprehensive English-language manual is designed to assist owners, technicians, and mechanics in maintaining and repairing their Mercury Mariner outboard engines. It includes detailed sections on scheduled maintenance, troubleshooting common issues, diagnostic procedures, and specific component services such as the gear housing, charging and starting systems, ignition system, and power trim. With hundreds of pages of content, including wiring diagrams, this manual offers the necessary guidance for all aspects of engine upkeep and repair.