This comprehensive service and repair manual covers Mercury outboard engines ranging from 45HP to 220HP, manufactured between 1977 and 1989. It is a detailed guide, filled with clear, step-by-step instructions and illustrations. This manual will equip you with the knowledge to troubleshoot and resolve problems efficiently. It includes information on a wide range of Mercury models, including 4-cylinder and 6-cylinder engines, as well as V6 models. Specifically, it covers the following models and years: 45hp, 4cyl, 2-stroke (1986-1989), 50hp, 3cyl, 2-stroke (1986-1989), 50hp 4cyl, 2-stroke (1982-1985), 60hp, 3cyl, 2-stroke (1984-1989), 70hp, 3cyl, 2-stroke (1980-1983), 75hp, 3cyl, 2-stroke (1987-1989), 75hp, 4cyl, 2-stroke (1984-1986), 80hp, 4cyl, 2-stroke (1978-1983), 85hp, 4cyl, 2-stroke (1977), 90hp, 3cyl, 2-stroke (1987-1989), 90hp, 6cyl, 2-stroke (1979-1986), 100hp, 4cyl, 2-stroke (1988-1989), 115hp, 4cyl, 2-stroke (1989), 115hp, 6cyl, 2-stroke (1978-1988), 135hp, v6, 2-stroke (1986-1989), 140hp, 6cyl, 2-stroke (1978-1980), 150hp, v6, 2-stroke (1979-1980), 175hp, v6, 2-stroke (1979-1980, 1985-1989), 200hp, v6, 2-stroke (1980-1989), and 220EFI, v6, 2-stroke (1987-1988). The manual provides comprehensive information on all aspects of maintenance and repair, including tuning, fuel and oil injection, ignition timing and synchronizing, powerhead, electrical systems, trim and tilt, lower unit, remote controls, hand rewind starter, and an appendix with additional information. It is the same manual used by professional technicians and mechanics, making it the perfect resource for DIY enthusiasts and those looking to save money on repairs.

The Mercury Outboard Engine 45HP-220HP, produced between 1977 and 1989, represents a significant era in the history of Mercury Marine. This range of outboard motors encompassed a wide power spectrum, catering to various boating enthusiasts, from recreational anglers to serious water skiers. Models within this timeframe were known for their durability, reliability, and relative ease of maintenance. This was achieved through the use of robust cast-iron powerheads, coupled with a design philosophy that emphasized simplicity and straightforward repair. While these engines incorporated a mix of technologies, including the iconic "Bigfoot" long-shaft models designed for deeper water applications, they were predominantly known for their carbureted power systems. However, the passage of time has brought about challenges. While spares for these engines are still readily available through specialized suppliers and online retailers, sourcing original parts can be a growing challenge. Additionally, the complexity of modern electronic ignition systems and fuel injection technology, not prevalent in engines of this era, means that an understanding of the older, more mechanical systems is crucial for successful maintenance and troubleshooting. This is where a comprehensive service and repair manual becomes invaluable. These manuals provide detailed diagrams, descriptions, and step-by-step instructions for everything from routine maintenance like spark plug replacement to more complex overhauls like cylinder head removal. Armed with this knowledge, a dedicated owner can keep their classic Mercury outboard performing at its best, ensuring many more seasons of reliable service on the water.