This comprehensive overhaul manual provides detailed instructions and specifications for the Jacobs R755-9 radial aircraft engine. Designed for use by certified aircraft mechanics, this manual covers every aspect of the overhaul process, from disassembly and inspection to reassembly and testing. It includes detailed diagrams, clear instructions, and comprehensive troubleshooting guides, ensuring a thorough and accurate overhaul. This manual is an essential resource for anyone working on the Jacobs R755-9 engine, particularly those involved in the maintenance and repair of T50 Cessna Bobcat aircraft.

The Jacobs R755-9 radial engine, a powerhouse of the skies, stands as a testament to engineering ingenuity and robust performance. This 9-cylinder, air-cooled radial engine, developed by the Jacobs Aircraft Engine Company, was renowned for its reliability and power output, making it a popular choice for a variety of aircraft applications. Its lineage can be traced back to the R-755, a 7-cylinder engine designed by the company in the 1930s, and the R755-9 represents a significant evolution, incorporating improvements in both power and efficiency.

The R755-9, boasting a displacement of 1,456 cubic inches, typically produced an impressive 550 horsepower at 2,500 RPM, making it a suitable choice for both military and civilian aircraft. Its robust construction featured a cast aluminum crankcase and forged steel connecting rods, designed to withstand the rigors of flight and ensure long service life. The engine's distinctive radial configuration, with its cylinders arranged in a circle around a central crankshaft, was celebrated for its inherent balance and smooth operation. The R755-9's performance characteristics, coupled with its reliable nature, made it a popular choice for a diverse range of aircraft, including light bombers, transport planes, and even some experimental aircraft. This radial engine, a symbol of aviation progress, continues to be a source of fascination for aviation enthusiasts and a reminder of the remarkable engineering achievements that propelled flight in the 20th century.