This manual covers the Mercury Mariner outboard engine, produced between 1988 and 1993. These engines are characterized by their reliable 4-cylinder, 115 HP 4-stroke configuration, designed for a wide range of marine applications. The Mariner series is known for its robust engineering and consistent performance, making it a dependable choice for boaters. This documentation provides essential information for understanding and operating your Mercury Mariner engine. The purpose of this comprehensive Factory Service Repair Manual is to assist owners and technicians in maintaining and repairing the Mercury Mariner outboard. It details critical maintenance procedures, including recommended intervals for annual service and water pump impeller replacement, along with guidance on spark plug maintenance and lubrication. Technical specifications, troubleshooting steps, and information on the CDI ignition system, water cooling method, and fuel system are also included. This manual is an indispensable resource for ensuring the longevity and optimal performance of your engine.