This manual covers Volvo Penta marine engines, including models 280, 280-DP, 285, 290, 290-DP, SP-A, SP-C, DP-A, DP-B, and DP-C. These inboard marine engines are designed for reliable performance and efficiency, featuring advanced fuel injection, robust cooling systems, and sophisticated engine control technology. While specific production years are not detailed, this guide encompasses a range of these dependable Volvo Penta units, intended for various marine applications where performance and durability are paramount. The purpose of this comprehensive Service and Repair Manual is to provide essential information for the maintenance, diagnosis, and repair of your Volvo Penta marine engine. It details general maintenance procedures, periodic lubrication, and troubleshooting guidance. Furthermore, the manual includes in-depth coverage of the engine's fuel system, cooling system, emission system, engine control system, transmission service, electrical system with wiring diagrams, chassis, body, suspension, steering, brake system, restraint system, and axle information. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance and longevity of their vessel's propulsion system.