This document pertains to the Mercury Mariner Marathon outboard motor, a robust and reliable engine designed for a variety of marine applications. While specific production years are not detailed, the Marathon Series represents a significant offering from Mercury, known for its engineering quality and performance. This particular model features a 55 HP engine, providing ample power for recreational boating and other watercraft needs. The Mariner Marathon is engineered for durability and ease of operation, making it a dependable choice for boat owners. This comprehensive Workshop Service Repair Manual, provided in English, offers detailed guidance for the maintenance, servicing, and repair of the Mercury Mariner 55 HP Marathon Outboard. It covers all models within the Marathon Series, providing essential information for owners and technicians alike. Within these pages, you will find step-by-step procedures, diagnostic troubleshooting guides, technical specifications, and safety recommendations. The manual is designed to empower users to perform routine maintenance, address potential issues, and ensure the optimal performance and longevity of their Mercury Mariner outboard motor.