The Jacobs R-755-9 is a robust 9-cylinder radial aircraft engine designed for aviation applications. With a displacement of 755 cubic inches, a bore of 5.25 inches, and a stroke of 5.00 inches, this air-cooled engine utilizes a dual magneto ignition system and operates on Avgas fuel. Engineered for reliability and performance, the R-755-9 represents a significant contribution to aviation powerplants, built by the Jacobs Aircraft Engine Company.

This English-language Overhaul Manual provides comprehensive guidance for the maintenance and repair of the Jacobs R-755-9 aircraft engine. It covers essential technical specifications, detailed overhaul procedures, and critical safety information. Owners, mechanics, and technicians will find detailed instructions for inspections, service intervals, and fluid requirements, ensuring the continued optimal performance and longevity of this aviation powerplant.