This workshop repair manual covers Mercury Mariner Outboard marine engines manufactured between 1987 and 1993. These pre-2000s models, known for their robust engineering, were designed for reliable performance in various marine applications. This manual focuses on engines with horsepower ratings of 70 HP and 75 HP, featuring spark ignition, carbureted fuel systems, and water-cooled operation. It provides detailed information essential for understanding and maintaining these robust outboard powerplants. The purpose of this comprehensive English-language manual is to serve as an authoritative guide for owners, technicians, and mechanics. It details all service and repair procedures, including step-by-step diagrams, wiring schematics, and diagnostic protocols. Furthermore, the manual includes critical technical specifications, torque settings, and information on fluid types and capacities, enabling effective maintenance and troubleshooting. Regular consultation of this manual ensures the longevity and optimal performance of your Mercury Mariner Outboard engine.