This service repair manual covers the Mercury Mariner outboard motor, designed for reliable performance. This manual is applicable to models with serial numbers 0R000001 and above. The Mariner series is engineered for durability and efficiency, featuring 4-stroke gasoline engines with CDI ignition and water-cooled systems, available in 4 HP, 5 HP, and 6 HP variants. Its robust construction and straightforward operation make it suitable for a variety of boating applications. This comprehensive manual provides essential information for the maintenance and repair of your Mercury Mariner outboard motor. It details crucial procedures, including lubrication with marine lubricants and adherence to scheduled maintenance intervals for break-in and annual service. The manual also outlines technical specifications and troubleshooting guidance, empowering owners, mechanics, and technicians to ensure optimal performance and longevity of the unit.