This workshop service repair manual covers Mercury Mariner 4 HP, 5 HP, and 6 HP 4-stroke outboard engines. These water-cooled engines are designed for reliable performance in various marine applications. The manual provides comprehensive information on the engineering and operational aspects of these models, ensuring owners and technicians have access to the details needed to understand and maintain their equipment. The purpose of this manual is to serve as a complete guide for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard engine. It includes detailed procedures for routine servicing, component diagnostics, technical specifications, and safety guidelines. By following the instructions within this manual, users can effectively preserve the operational integrity and longevity of their engine.