This Service & Repair Manual provides comprehensive guidance for the Mercury 440 S R, an outboard motor designed for marine propulsion. Engineered for reliability and performance, the Mercury 440 S R represents a commitment to quality in marine applications. This manual is an essential resource for understanding and maintaining the intricate systems of your Mercury outboard motor, ensuring its continued optimal operation. The purpose of this manual is to offer detailed instructions for all aspects of repair and maintenance. It covers every component, from routine servicing to complex overhauls, presented with clear text and illustrative aids. This guide is structured to empower owners and technicians alike, providing the knowledge and step-by-step procedures necessary for effective troubleshooting, repair, and upkeep, ultimately supporting informed maintenance decisions and ensuring customer satisfaction.