This manual covers Mercury Mariner 2-Stroke Outboard Motors manufactured between 1987 and 1993. It provides comprehensive information for models ranging from 70 HP to 115 HP, including specific variants such as the 75 HP Marathon, 75XD, and Seapro. These engines are known for their robust engineering and reliability, featuring an oil injection system for enhanced performance and longevity. This guide is designed to assist owners and technicians in understanding and maintaining these powerful outboard motors. The purpose of this Service Repair Manual is to offer detailed guidance for the repair, maintenance, and refurbishment of your Mercury Mariner outboard motor. It includes step-by-step instructions, diagnostic procedures, troubleshooting assistance, and technical specifications, complete with torque values and wiring schematics. With detailed illustrations and diagrams, this manual is an indispensable resource for both do-it-yourself enthusiasts and experienced mechanics aiming to ensure optimal performance and longevity of their 1987-1993 Mercury Mariner 2-Stroke Outboard Motors.