This service repair manual covers the Mercury Mercruiser Marine Engine GM V-6 262 CID (4.3L) models, specifically the MCM 4.3L ALPHA / BRAVO, MCM 4.3LH ALPHA / BRAVO, and MCM 4.3L EFI ALPHA /BRAVO variants. Engineered for reliability and performance, these V-6 engines provide robust power for marine applications, featuring both carbureted and electronic fuel injection systems, and are available in seawater-cooled and closed-cooled configurations. The manual details the engine's integral components, including its electrical and charging systems, designed to ensure optimal operation and longevity on the water. This comprehensive English-language manual, spanning 790 pages, provides essential information for owners and technicians. It includes detailed sections on removal and installation, engine systems, electrical and fuel systems, cooling and exhaust systems, drives, and power steering. With clear, step-by-step instructions, zoomable illustrations, and exploded views, this manual facilitates preventative maintenance, routine servicing, and in-depth troubleshooting for immediate problem resolution. It also covers diagnostic procedures, ensuring that all aspects of the engine's operation can be understood and maintained.