This Service Repair Workshop Manual provides comprehensive information for Mercury Mariner outboard engines manufactured between 1987 and 1993. These 3-cylinder, 75 HP engines feature carburetion, an oil injection system, and robust electrical and ignition systems. This manual covers various components including the powerhead, trim and tilt systems (Design I and II), electrical systems (battery, charging, starting, and wiring diagrams), tiller handle, and mounting procedures. The engineering quality and reliability of these Mercury Mariner outboards are supported by detailed technical specifications and procedures. The purpose of this manual is to serve as an essential guide for owners and technicians, offering detailed step-by-step repair instructions, diagnostic procedures, and troubleshooting guidance. It covers routine maintenance tasks such as oil changes, spark plug replacement, and air filter changes, highlighting the high potential for cost savings. With clear diagrams and illustrations, this manual is suitable for individuals with basic mechanical skills as well as independent professionals, ensuring the proper maintenance and repair of your Mercury Mariner outboard engine.