This Service Repair Manual covers Volvo Penta Aquamatic sterndrive models, including the 280-DP, 285, and 290-DP series, along with associated engines such as the 280, 290, SP-A, SP-C, DP-A, DP-B, and DP-C. These sterndrives are engineered with Duoprop technology for enhanced performance and efficiency. The manual is designed to provide comprehensive guidance for maintaining and repairing these robust marine propulsion systems, ensuring their continued optimal operation. The purpose of this manual is to serve as an invaluable resource for both do-it-yourself mechanics and experienced technicians. It details essential repair and maintenance procedures, including sterndrive removal, installation, and servicing of the trim system and transom shield. Furthermore, the manual includes specialized procedures such as welding and painting, alongside technical data and electrical wiring diagrams. With over 200 pages of detailed illustrations, step-by-step instructions, and diagrams, this manual is an inexpensive way to keep your Volvo Penta Aquamatic sterndrive working properly.