This manual covers the Volvo Penta DP-A sterndrive, a robust marine propulsion system designed for a range of applications. The DP-A sterndrive is engineered for reliability and performance, featuring a dual propeller (Duoprop) system for enhanced maneuverability and efficiency. It is compatible with various V6 and V8 marine inboard engines, offering power outputs typically ranging from 200 to over 350 horsepower, depending on the specific engine configuration and tuning. The sterndrive's design emphasizes durability and optimal power transfer, making it a dependable choice for boat owners and operators. The purpose of this comprehensive service repair manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of the Volvo Penta DP-A sterndrive. It includes essential information such as diagnostic, repair, rebuilding, refurbishing, and restoration procedures, alongside recommended service intervals. Furthermore, the manual contains vital technical specifications and electrical system details, including wiring diagrams and troubleshooting guides. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the longevity and optimal performance of their DP-A sterndrive unit.