This Service Repair Manual covers the 1999 Mercury Mariner outboard motor. Engineered for reliability and performance, this FourStroke engine delivers 40-50 horsepower and features a robust 4-cylinder configuration. Its carbureted fuel induction system and CDI ignition ensure efficient operation, while the outboard lower unit with Forward-Neutral-Reverse gearing provides dependable propulsion for a variety of marine applications. The Mercury Mariner is built to withstand demanding conditions, offering a quality boating experience. This comprehensive manual provides essential information for maintaining and repairing your 1999 Mercury Mariner. It details critical procedures, technical specifications, and troubleshooting guidance necessary for optimal performance and longevity. Owners, technicians, and mechanics will find the English-language instructions invaluable for routine servicing, diagnostics, and repairs, ensuring the continued reliability and efficiency of the outboard motor.