This comprehensive service and repair manual covers all aspects of the Mercury Mariner Outboard 70 Hp Marathon 3 Cylinder engine, manufactured between 1987 and 1993. It provides detailed instructions and diagrams for every step of maintenance and repair, ensuring you have the knowledge and guidance you need to keep your engine running smoothly. The manual includes sections on general information and specifications, electrical and ignition systems, battery, charging and starting systems, timing, fuel system and carburetion, oil injection system, powerhead, lower unit, gear housing, mid section, shock absorber, power trim, outboard motor installation, engine attachments, and tiller handle and co-pilot. With this manual, you can troubleshoot and fix problems, perform routine maintenance, and even complete major overhauls. It's the same manual used by your local dealer, providing you with all the information you need to effectively diagnose and repair your engine.

The Mercury Mariner 70 hp Marathon 3-cylinder outboard motor, produced between 1987 and 1993, was a reliable and popular choice for recreational boating. This engine was renowned for its smooth operation, low fuel consumption, and ease of maintenance. It featured a robust 3-cylinder, 2-stroke design with a displacement of 70 cubic inches (1148 cc), delivering a peak power output of 70 horsepower at 4800 RPM. The Marathon's lightweight construction and compact dimensions made it suitable for a wide range of boats, from small fishing vessels to larger runabouts. The Mercury Mariner 70 hp Marathon incorporated a number of innovative features that contributed to its efficiency and performance. Notably, it featured a CDI (Capacitive Discharge Ignition) system for precise spark delivery, ensuring reliable starting and smooth engine operation. The engine also benefited from a specially designed powerhead that incorporated a low-friction crankshaft and piston rings, minimizing wear and tear. Further enhancing its practicality, the Marathon incorporated a built-in tilt and trim system, allowing for easy adjustment of the engine's operating angle for optimal performance in various water conditions. While no longer in production, the Mercury Mariner 70 hp Marathon remains a sought-after engine for its reliability, performance, and ease of maintenance.