This workshop service manual covers the Mercury Mariner outboard motor manufactured between 2002 and 2005. This engine features a 4-stroke, water-cooled design with electronic fuel injection (EFI) and produces 40 horsepower. It is designed for reliable performance and efficient operation, making it a dependable choice for various marine applications. This comprehensive manual provides essential information for the maintenance, repair, and servicing of your Mercury Mariner outboard. It details procedures for engine upkeep, troubleshooting common issues, and understanding technical specifications. By following the guidelines within this manual, owners and technicians can ensure the longevity and optimal performance of the motor.