This manual covers the Mercury Mariner outboard motor, specifically models equipped with the 3.0L Marathon engine. Designed for marine applications, this powerful and reliable outboard motor features a 6-cylinder, V6 gasoline engine with a displacement of 3.0 liters. Its robust construction and advanced fuel injection system ensure efficient performance on the water. The Mariner is engineered for durability and consistent operation, making it a trusted choice for boaters seeking dependable propulsion. This comprehensive Service Repair Workshop Manual provides detailed information essential for the maintenance and repair of your Mercury Mariner outboard motor. It covers critical areas including lubrication, cooling system operation, fuel and ignition systems, and electrical components. With step-by-step procedures, technical specifications, and troubleshooting guidance, this manual is an indispensable resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the 3.0L Marathon engine.