This workshop service repair manual covers the Volvo Penta DP-SMTD1 Stern Drive, a robust marine diesel propulsion system. Engineered for reliability and performance, this stern drive unit is designed to deliver efficient power for a variety of maritime applications. Its advanced internal combustion engine, coupled with a Duoprop stern drive transmission, ensures optimal maneuverability and fuel economy. The seawater-cooled system is built to withstand demanding marine environments, making it a dependable choice for boat owners and operators. This comprehensive manual provides essential information for the maintenance, diagnosis, and repair of the Volvo Penta DP-SMTD1 Stern Drive. It includes detailed step-by-step instructions, clear illustrations, and crucial diagnostic tools such as wiring diagrams and troubleshooting guides. Coverage extends to all major systems, including engine mechanical and electrical components, fuel system, emission control, clutch, transaxle, driveshaft, steering, and brakes. This resource is invaluable for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their marine propulsion system.