This repair manual covers Mercury Mariner outboard motors manufactured between 1977 and 1989, encompassing models with horsepower ranging from 45 to 220hp. These engines are designed for reliable performance in various marine applications, featuring robust construction and an outboard drive system. The water-cooled system ensures efficient operation, contributing to the overall durability and effectiveness of these Mercury Mariner units. This comprehensive English-language repair manual provides detailed information essential for the maintenance and repair of your Mercury Mariner outboard motor. It includes in-depth coverage of repair procedures, troubleshooting guides, and maintenance schedules, along with diagrams for parts identification. This manual is intended for mechanics, service technicians, and experienced DIY users seeking to maintain and repair their Mercury Mariner outboard motors effectively.