This manual covers Mercury Mercruiser Marine Engines, specifically the #15 GM V-8 Cylinder models produced between 1989 and 1992. These gasoline-powered marine engines feature a V-8 cylinder configuration and are available in displacements of 305/350 CID (5.0/5.7 Litre) and 454/502 CID (7.4/8.2 Litre). Fuel delivery is managed by either a 2 Barrel Carburetor (MerCarb) or a Weber Carburetor. The engines are designed for seawater-cooled or closed-cooled systems and include comprehensive electrical system components for starting, ignition, charging, and instrumentation. This Service Repair Workshop Manual in English provides essential information for the repair and maintenance of your Mercury Mercruiser marine engine. It details general information, removal and installation procedures for various drive systems including MCM Alpha One and MCM Bravo One and Two, engine overhauls, electrical systems, fuel systems, cooling systems, exhaust systems, and power steering. The manual includes easy-to-read text, high-quality diagrams, and printable pages, making it an indispensable resource for owners and technicians to ensure optimal performance and longevity of the marine engine.