This manual covers the Volvo Penta 285 / 285A sterndrive, a robust component known for its engineering quality and reliability in marine applications. While specific production years are not detailed, this service repair manual is designed to provide comprehensive information for maintaining and repairing this particular model. Its intended usage is for marine propulsion systems where dependable performance is paramount. The purpose of this English-language Factory Service Repair Manual is to equip owners, mechanics, and technicians with the necessary knowledge for effective vehicle upkeep. It includes detailed repair instructions, step-by-step maintenance procedures, advanced troubleshooting guides, technical specifications, and information on special tools. Coverage extends to critical areas such as the lower gear system, propeller shaft, forward gear system, transom shield, trim system, and electrical systems with wiring diagrams, ensuring thorough understanding and efficient servicing.