This manual covers the Volvo Penta AQ131, AQ151, and AQ171 marine engines. These engines are engineered for reliable performance in demanding marine environments. Their robust construction and efficient design ensure dependable operation for a wide range of boating applications, making them a preferred choice for both recreational and professional use. This comprehensive service repair workshop manual provides essential information for maintaining and repairing your Volvo Penta AQ131, AQ151, or AQ171 marine engine. It includes detailed step-by-step instructions, exploded diagrams, and high-quality photos to guide you through all repairs, servicing, and troubleshooting procedures. This resource is designed to assist owners, mechanics, and technicians in ensuring the longevity and optimal performance of their marine engines.