The Volvo AQ120 is a robust inline 4-cylinder engine, displacing 2.1 liters and producing 130 horsepower. Designed for marine applications, it features a water-cooled system and typically utilizes a carbureted fuel system, often with Zenith or Stromberg components, along with a distributor-based ignition. This engine is known for its reliable performance and enduring engineering, making it a dependable choice for various watercraft. This Service Repair Manual provides comprehensive guidance for the Volvo AQ120 engine. It covers essential maintenance procedures, detailed troubleshooting steps for common issues, and technical specifications necessary for proper upkeep. The manual is an indispensable resource for owners, mechanics, and technicians, offering the knowledge required to maintain, diagnose, and repair the engine, ensuring its continued optimal performance and longevity.