This workshop service manual covers the Volvo Penta AQ171 marine engine. While specific production years are not detailed, this engine is known for its robust construction and reliable performance in marine applications. It is a gasoline-powered, naturally aspirated, 4-cylinder engine with a displacement of approximately 2.3 liters and an estimated horsepower range of 170-180 HP. The AQ171 is engineered for durability and efficiency, making it a dependable choice for various boating needs. This comprehensive English-language manual provides extensive information for maintaining and repairing the Volvo Penta AQ171. It includes detailed step-by-step repair procedures, overhaul instructions, periodic maintenance charts, and diagnostic troubleshooting information. Wiring schematics are also provided to assist with electrical system issues. This manual is an essential resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their AQ171 engine.