This workshop service repair manual covers sterndrive Units, including the R, MR, Alpha One, and Alpha One SS models produced between 1983 and 1990. As the First Generation Alpha, these units were engineered for reliability and performance across a range of engine displacements from 3.0L to 7.4L, delivering power outputs from 120 HP up to the 454 Magnum. The manual encompasses various components, from transom assemblies and power trim systems to steering mechanisms and corrosion protection, ensuring comprehensive support for these marine propulsion systems. This manual is designed to assist both novice owners and professional technicians in maintaining and repairing their sterndrive units. It provides detailed procedures, technical specifications, and troubleshooting guidance for all aspects of the sterndrive, including preventive maintenance to ensure optimal performance and longevity. Covered topics include detailed explanations of power trim systems, steering systems, and corrosion protection measures applicable to all models, along with specific information on gear ratios and counter-rotation capabilities.