This workshop service repair manual covers the Volvo AQ131 2.3L inline 4-cylinder engine. As part of the renowned AQ Series, this engine is known for its robust construction, featuring a cast iron block and aluminum cylinder head, and is water-cooled with a wet sump lubrication system. Its 2.3-liter displacement and a power output of 141 hp make it a capable unit for its intended applications. The engine utilizes a carbureted fuel delivery system and a distributor-based ignition, likely with a timing belt for valve operation. This manual is designed to provide comprehensive information for a range of production years associated with this engine model.

The purpose of this English-language workshop service repair manual is to serve as an authoritative resource for owners, mechanics, and technicians. It details essential maintenance procedures, troubleshooting guides, and technical specifications necessary for the upkeep and repair of the Volvo AQ131 engine and its associated marine gearbox. The manual covers critical aspects of the engine's operation, including its cooling, lubrication, fuel, and ignition systems, providing the necessary knowledge to ensure optimal performance and longevity. Its extensive content is presented to facilitate effective diagnostics and repairs.