This workshop service repair manual covers the Volvo Penta AQ231 engine, specifically the AQ231 5.0L (305) V8 model. Designed for marine applications, this engine is known for its robust construction and reliable performance. The AQ231 series offers a powerful V8 configuration with a 5.0-liter displacement, making it suitable for a wide range of boating needs. Its engineering emphasizes durability and efficiency, ensuring consistent operation in demanding marine environments. This comprehensive manual provides detailed information essential for the maintenance, repair, and troubleshooting of your Volvo Penta AQ231 engine. It includes step-by-step procedures, technical specifications, diagnostic guides, and wiring diagrams. Whether you are a seasoned technician or an owner performing routine upkeep, this resource will assist you in keeping your engine in optimal condition, ensuring longevity and peak performance.