This workshop service repair manual covers the Mercury Mercruiser Alpha One SS Stern Drive, manufactured between 1983 and 1990. As the first generation Alpha One, this sterndrive unit is engineered for reliability and performance, designed to integrate with a wide range of Mercury and Mercruiser gasoline engines, from 2.5L to 7.4L, and compatible with V6 and V8 configurations. Its robust aluminum alloy lower unit and hydraulic power trim and tilt system contribute to its enduring reputation in marine propulsion, providing efficient power transfer and precise control for various boating applications. The purpose of this comprehensive English-language manual is to provide detailed guidance for the maintenance, repair, and servicing of the Alpha One SS Stern Drive. It encompasses essential information on technical specifications, operational procedures, troubleshooting common issues, and recommended maintenance schedules, including annual inspections and gear lube changes. Owners, technicians, and mechanics will find the instructions and data within this manual invaluable for ensuring the longevity and optimal performance of their Mercury Mercruiser Alpha One SS Stern Drive.