This manual covers the Mercury Mariner outboard motor, a 4-stroke engine delivering 9.9 horsepower. Designed for outboard motor applications, this model exemplifies robust engineering and reliable performance. Its construction and components are built to ensure consistent operation and durability in demanding marine environments. This comprehensive service manual provides essential information for the maintenance, repair, and troubleshooting of your Mercury Mariner. It includes detailed step-by-step repair procedures with illustrations, covering all major components such as the powerhead, lower unit, midsection, starting system, and fuel pump. Additionally, it offers advanced troubleshooting guidance for the electrical system, including wiring diagrams, and covers controls for both tiller and remote operation. This resource is indispensable for owners and technicians seeking to maintain the optimal performance and longevity of their outboard motor.