This comprehensive workshop service manual provides detailed instructions and specifications for the repair and overhaul of Mercury Mariner 75 HP Marathon 3 Cylinder Outboard engines manufactured from 1987 to 1993. It covers a wide range of topics, including engine disassembly and assembly, troubleshooting, component identification, specifications, diagrams, and wiring schematics. This manual is an essential resource for mechanics, technicians, and boat owners seeking to perform maintenance, repairs, or rebuilds on their Mercury Mariner 75 HP Marathon 3 Cylinder Outboards. It provides the necessary information and guidance to ensure proper procedures are followed and successful repairs are achieved.

The Mercury Mariner 75 HP Marathon, a 3-cylinder outboard motor, was a popular choice for boaters in the late 1980s and early 1990s. Built to provide reliable power for a range of boats, from small fishing boats to larger cruisers, this engine was renowned for its durability and ease of maintenance. The Mariner 75 HP Marathon featured a compact design, making it suitable for use on boats with limited space. The 3-cylinder engine provided a smooth and quiet operation, particularly at lower RPMs. This engine was known for its fuel efficiency, which was critical for extended outings and prolonged use. Overall, the Mercury Mariner 75 HP Marathon was a dependable and versatile outboard motor designed to meet the needs of recreational boaters.

The Mercury Mariner 75 HP Marathon was powered by a 75 horsepower, 3-cylinder, 2-stroke engine. The engine's displacement was 75 cubic inches, and it featured a single carburetor and electronic ignition system. The engine was also equipped with a built-in oil injection system, which automatically mixed oil and fuel for a consistent 50:1 ratio, ensuring optimal engine performance and longevity. The Mercury Mariner 75 HP Marathon offered features like a power trim and tilt system for easy maneuverability and convenient storage. The engine's propeller could be adjusted to suit various water conditions and boat sizes. With its robust construction and high-quality materials, the Mercury Mariner 75 HP Marathon was built to withstand the rigors of frequent use and harsh environments. The engine was designed for ease of maintenance, with readily accessible components and a straightforward service schedule. This user-friendly approach ensured that owners could perform routine maintenance themselves, keeping the engine running smoothly for years to come.