This workshop service repair manual covers Mercury Mercruiser and Mercury Racing marine sterndrive engines produced between 1963 and 2008. It encompasses a wide range of engine types, including 4-cylinder, 6-cylinder (L6), V8, and various diesel models, as well as specific engine displacements and sterndrive configurations. The manual is designed to provide comprehensive support for the service and repair of these powerful marine propulsion systems, ensuring their continued performance and reliability on the water. The purpose of this manual is to offer detailed, step-by-step instructions for all aspects of engine maintenance and repair. It includes A-Z repair procedures, diagnostic guidance for PCM 555 and ECM 555 systems, and information on components such as the Dry Joint Exhaust System, Gen III Cool Fuel, and Turn Key Start (TKS) Carburetors. With detailed illustrations, exploded diagrams, and photos, this English-language resource empowers owners, mechanics, and technicians to effectively maintain, troubleshoot, and repair their Mercury Mercruiser or Mercury Racing sterndrive engines.