The Mercury Mercruiser MCM 3.0L Alpha, produced between 1998 and 2006, is a robust marine engine built on the reliable GM 4 Cylinder engine family. This inline 4-cylinder, 181 cubic inch (3.0L) powerplant features a MerCarb 2-barrel carburetor, standard electronic ignition, and electric starter, delivering an estimated 130-140 horsepower. Designed for stern drive applications with the Alpha Drive, it offers versatility with options for power steering and can be configured for either seawater or closed cooling systems. Its engineering prioritizes dependable performance and longevity, making it a trusted choice for various marine applications. This comprehensive Service and Repair Manual provides detailed, step-by-step instructions and illustrations for the maintenance, troubleshooting, and repair of the Mercury Mercruiser MCM 3.0L Alpha. Covering essential areas such as general information, engine, electrical system, fuel system, cooling system, exhaust system, and power steering, this manual is an indispensable resource for owners, mechanics, and technicians. It is designed to assist in keeping the engine operating at peak performance and to facilitate efficient and accurate repairs, ensuring the continued reliability and longevity of your marine propulsion system.