This workshop service manual covers the Mercury Mariner Marathon outboard motor, a water-cooled gasoline engine producing 60 horsepower. Its transmission features forward, neutral, and reverse gears within an outboard lower unit. While specific production years are not detailed, this manual is designed to assist in the operation and maintenance of this marine propulsion system, highlighting its engineering for reliable performance on the water. The purpose of this English-language manual is to provide comprehensive guidance for qualified technicians. It includes detailed troubleshooting procedures, overhaul instructions for disassembly and reassembly, and information on the electrical and cooling systems. Owners and service professionals will find the necessary technical specifications and maintenance schedules within these pages to ensure the continued optimal function and longevity of their Mercury Mariner Marathon outboard motor, assuming a foundation in general marine practices.