This workshop service manual covers the Mercury Mariner Marathon 75 HP outboard engine produced between 1987 and 1993. This water-cooled, 3-cylinder outboard engine delivers 75 horsepower and features a likely carbureted fuel induction system and a CDI ignition system. Designed for reliable performance, the Marathon 75 HP is a robust choice for various marine applications. Its engineering prioritizes durability and efficient operation, making it a dependable option for boaters. This manual provides comprehensive guidance for maintaining and repairing your Mercury Mariner Marathon 75 HP outboard. It includes detailed procedures for routine maintenance, troubleshooting common issues, and understanding technical specifications. Essential information on lubrication, ignition, and electrical systems is covered, along with details on the power trim and tilt system. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of the engine.