This workshop service repair manual provides comprehensive information for the Volvo Penta 285 / 285A. While specific production years are not detailed, this manual covers essential aspects of the internal combustion engine, including its fuel system, cooling system, exhaust system, fuel filter, alternator, and regulator. Detailed procedures for disassembly and assembly, along with hundreds of photos and illustrations, are included to aid in understanding the engine's components and construction. The purpose of this English-language manual is to guide owners, mechanics, and technicians through the maintenance, repair, and servicing of the Volvo Penta 285 / 285A. It features detailed procedures for check and maintenance, an advanced troubleshooting guide, and specific technical data such as servicing specifications and tightening torques. Safety precautions and information on special tools are also provided, ensuring that all work is performed correctly and safely. The manual's structure, with numbered instructions and detailed substeps, facilitates efficient and accurate service.