This workshop service repair manual covers the Volvo Penta DP-B DP-B1, a dual-propeller drive system designed for reliable marine propulsion. While specific production years are not detailed, the engineering quality inherent in Volvo Penta products ensures robust performance and longevity for various boating applications. This manual provides comprehensive guidance for maintaining and servicing this drive unit. The purpose of this manual is to serve as an indispensable resource for both do-it-yourself enthusiasts and experienced mechanics. It details essential maintenance procedures, including engine identification, cooling, exhaust, fuel, and electrical systems, alongside disassembly and assembly instructions. With hundreds of photos and illustrations, step-by-step guidance, and critical notes, cautions, and warnings, this manual facilitates efficient troubleshooting and repair, ensuring the optimal performance and longevity of your Volvo Penta DP-B DP-B1 drive.