This Service Repair Manual covers the 1989 Mercury Outboard Engine, a versatile marine propulsion system engineered for reliability and performance across a power range of 45 to 220 horsepower. These water-cooled engines, available in various configurations, utilize either carbureted or fuel-injected fuel systems depending on the specific model. Designed for demanding marine environments, the Mercury Outboard Engine is known for its robust construction and consistent power delivery, making it a trusted choice for a wide array of boating applications. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of your 1989 Mercury Outboard Engine. It details critical procedures, technical specifications, and safety guidelines necessary to ensure optimal performance and longevity. Owners, technicians, and mechanics will find detailed instructions on lubrication, scheduled servicing, ignition system maintenance, and fuel system care, enabling effective upkeep and problem resolution for this dependable marine power unit.