This service and repair manual covers the Mercury 340 S, T, a specialized vehicle designed for demanding tasks. Built with engineering quality and reliability in mind, the Mercury 340 S, T represents a robust option for its intended use. Its design prioritizes performance and durability, making it a dependable choice for various applications. This comprehensive guide provides detailed information for the maintenance and repair of your Mercury 340 S, T. It includes step-by-step instructions, illustrations, and technical specifications covering a wide range of procedures, from routine oil changes to more complex transmission work. This manual is essential for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their vehicle.