The Mercury Mariner, produced between 2002 and 2005, represents a robust and reliable marine engine designed for a variety of watercraft applications. This particular model features a 4-stroke EFI engine with an inline 3-cylinder configuration, displacing 747cc (45.4 cubic inches) and delivering 40 horsepower. Its water-cooled system ensures efficient operation, while the Electronic Fuel Injection (EFI) and CDI ignition systems contribute to its performance and dependability. The engine is engineered for durability and consistent power output, making it a trusted choice for boaters seeking dependable propulsion. This Service Repair Manual provides comprehensive guidance for the maintenance and repair of your Mercury Mariner engine. It covers essential information including detailed maintenance procedures, troubleshooting diagnostics, technical specifications, and critical safety guidelines. The manual is designed to assist owners, mechanics, and technicians in performing routine servicing, addressing potential issues, and ensuring the longevity and optimal performance of the engine. With this resource, you can confidently manage all aspects of your Mariner's upkeep.