This workshop service repair manual covers the Mercury Mariner Outboard motor, a powerful 115 HP outboard motor designed for marine applications. Featuring a 2.1-liter, 4-stroke engine with Electronic Fuel Injection (EFI), this motor is engineered for reliable performance on the water. Its robust construction and efficient design make it suitable for a variety of boating needs, from recreational cruising to demanding commercial use. The manual provides comprehensive information to ensure optimal operation and longevity of this Mercury outboard. The purpose of this English-language manual is to serve as a definitive guide for owners, technicians, and mechanics. It details essential maintenance procedures, including lubrication specifications and service intervals, as well as in-depth troubleshooting guidance. Technical specifications, such as engine details, cooling system information, electrical system components, and propeller recommendations, are thoroughly explained. This resource is designed to empower users with the knowledge required for proper upkeep, repair, and maintenance, ensuring the Mercury Mariner Outboard operates at peak efficiency and reliability.