The Mercury Mariner 30 HP Marathon outboard motor, designed for marine applications, represents a robust and reliable choice for boaters. This 2-cylinder, water-cooled gasoline engine delivers 30 horsepower, engineered for dependable performance on the water. Specific models are identified by serial numbers 0G044027 and above, belonging to a particular generation of this outboard motor drive. This Service Repair Manual provides comprehensive guidance for the maintenance and repair of your Mercury Mariner 30 HP Marathon. It covers essential procedures, including lubrication and general maintenance, along with detailed repair instructions. This manual is an indispensable resource for owners and technicians seeking to ensure the optimal performance and longevity of their outboard motor.