This workshop repair manual covers the Mercury Mariner outboard motor series, specifically the 75, 90, 100, 115, and 125 horsepower models. These engines are engineered for reliable performance on the water, offering a range of power outputs suitable for various boating applications. The Mariner series is known for its robust construction and efficient operation, making it a dependable choice for recreational and professional use. This manual provides comprehensive information to ensure optimal performance and longevity of your Mercury Mariner outboard. The purpose of this manual is to provide detailed guidance for the service, maintenance, and troubleshooting of your Mercury Mariner outboard motor. It includes essential technical specifications, step-by-step repair procedures, diagnostic information, and recommended maintenance schedules. By following the instructions within this manual, owners, technicians, and mechanics can effectively perform routine upkeep, identify and resolve issues, and ensure the safe and efficient operation of the engine. This resource is designed to be an indispensable tool for maintaining the integrity and functionality of your Mercury Mariner outboard.