This manual covers the Mercury Mariner Model 40, 50, and 60 4-Stroke EFI Outboard Motor, manufactured in 2002. Designed for reliable performance on the water, these outboard motors are known for their efficient 4-stroke EFI technology and robust water-cooling systems. This particular model, identified by serial number 0T409000, represents a significant advancement in marine propulsion, offering dependable power for a variety of boating applications. This comprehensive service manual provides essential information for the upkeep and repair of your Mercury Mariner outboard motor. It details routine maintenance, engine removal and installation, lubrication, fuel system service, and electrical system service. Furthermore, the manual includes advanced troubleshooting guides and specific engine specifications to ensure optimal performance and longevity. This resource is invaluable for owners, technicians, and mechanics seeking to maintain and repair this gasoline-powered, water-cooled engine.