The Volvo AQ171 is a robust 2.5-liter inline 4-cylinder marine engine, delivering 152 horsepower and designed for reliable performance in marine applications. This engine, often paired with a Volvo Penta outdrive or sterndrive system, features a carbureted fuel system and is engineered for durability and efficiency on the water. Its construction emphasizes the quality and dependability characteristic of Volvo marine propulsion, making it a suitable choice for a variety of boating needs. This Workshop Service Repair Manual provides comprehensive guidance for the Volvo AQ171 marine engine. It covers essential maintenance procedures, detailed troubleshooting steps for common issues related to the engine, fuel, ignition, and cooling systems, and critical technical specifications. The manual is designed to assist owners, technicians, and mechanics in effectively maintaining, diagnosing, and repairing the AQ171 engine, ensuring its optimal performance and longevity.