This Service Workshop Manual covers Mercury Mariner 70, 75, 80, 90, 100, and 115 horsepower outboard engines. These engines, typically 2-stroke and water-cooled, offer a range of power options suitable for various marine applications. With displacements varying by model, such as 1.7L or 2.0L, and utilizing CDI ignition and carbureted fuel delivery, these outboards are designed for reliable performance. The manual encompasses a wide range of production years, identifiable by specific serial number ranges for different regions, including the United States, Belgium, and Canada. The purpose of this manual is to provide comprehensive guidance for the maintenance, repair, and servicing of your Mercury Mariner outboard. It details essential procedures, technical specifications, and troubleshooting steps necessary to keep your engine operating at peak efficiency. Covered topics include routine maintenance schedules, recommended fluids and parts, engine specifications, and drive system information. This resource is invaluable for owners, technicians, and mechanics seeking to ensure the longevity and optimal performance of their Mercury Mariner outboard motor.