This manual covers the Volvo Penta AQ131, AQ151, and AQ171 marine engines. These internal combustion engines are designed for service, repair, and maintenance, representing Volvo Penta's commitment to engineering quality and reliability. This comprehensive guide provides in-depth information essential for understanding and operating these marine power units. The purpose of this English-language Service & Repair Manual is to provide detailed instructions for all servicing, maintenance, and repair jobs. It includes step-by-step guidance, detailed repair procedures, routine maintenance schedules, and wiring diagrams with pictures. This resource is invaluable for owners, mechanics, and technicians seeking to maintain their Volvo Penta AQ131, AQ151, and AQ171 engines effectively and ensure their optimal performance.