This Service Repair Manual covers Mercury Mariner Outboard engines with 40, 50, 55, and 60 horsepower. These 2-stroke engines are designed for reliable performance in marine applications. Serial numbers for this manual's coverage begin with US 0G531301 and Belgium 09974454. This manual provides comprehensive information to ensure optimal operation and longevity of your Mercury Mariner outboard. This manual offers detailed, illustrated, step-by-step instructions for all aspects of maintenance, repair, troubleshooting, and diagnosis. It includes coverage of electrical systems, fuel systems, powerheads, mid-sections, lower units, starter systems, and control linkages. Detailed part number breakdowns and zoomable illustrations with exploded views are provided to assist owners, mechanics, and technicians in performing all necessary service procedures accurately and efficiently.