The Volvo Penta AQ125B is a robust marine engine from the AQ Series, engineered for reliable performance in a variety of marine applications. This inline 4-cylinder engine displaces 2.3 liters and features an overhead valve train, delivering approximately 141 horsepower. Designed with durability and efficiency in mind, the AQ125B is known for its consistent operation and suitability for recreational boating. Its stern drive or inboard-outboard configuration offers versatility for different hull types and operational needs. This comprehensive Factory Service Repair Manual provides essential information for maintaining and repairing the Volvo Penta AQ125B marine engine. It covers detailed procedures for routine maintenance, including lubrication and cooling system servicing, along with in-depth troubleshooting guidance. Technical specifications, such as engine dimensions, compression ratios, and performance data, are included to assist owners, mechanics, and technicians in understanding and servicing the unit. The manual's complete scope ensures that all aspects of the engine's operation and upkeep are addressed.