This Service & Repair Manual provides comprehensive guidance for the Mercury 340 S R Marine Outboard Motor, designed for reliable propulsion on boats. Engineered with quality and durability in mind, this internal combustion, gasoline-powered outboard motor is built to deliver consistent performance. Its robust construction and efficient design make it a dependable choice for a variety of marine applications. This manual serves as an essential resource for owners and technicians, detailing fundamental maintenance and repair procedures. It covers a wide range of tasks, from routine oil changes to more complex transmission swaps, offering step-by-step instructions and illustrations to ensure proper upkeep and functionality. By following the procedures outlined within, users can effectively maintain and repair their Mercury 340 S R, maximizing its lifespan and operational efficiency.