This manual covers the Volvo Penta AQ255 5.7L (350) V8 marine engine, a robust and reliable V8 power plant designed for marine applications. With a displacement of 5.7 liters (350 cubic inches), this engine is engineered for performance and durability. This comprehensive service repair manual is intended for both do-it-yourself enthusiasts and experienced mechanics, providing detailed information to ensure the optimal functioning and longevity of your Volvo Penta engine. The purpose of this manual is to provide complete guidance for the repair and service of the Volvo Penta AQ255 5.7L (350) V8 engine. It includes step-by-step instructions, hundreds of photos and illustrations, and covers all essential areas such as safety, tuning, engine systems, fuel and ignition, electrical, cooling, stern drive, tilt/trim, and steering. This resource is designed to empower owners and technicians with the knowledge required for effective maintenance and repair, ensuring the vessel remains in peak operating condition.