This manual covers the Lycoming O-235 series aircraft engine, a four-cylinder, horizontally opposed, air-cooled piston engine designed for light aircraft propulsion. With a displacement of 235 cubic inches, the O-235 is known for its reliable performance and robust engineering, making it a staple in aviation. This illustrated parts catalog, version PC-302, supersedes previous versions PC-102 and PC202, and is presented in English.

The purpose of this illustrated parts catalog is to provide a comprehensive listing of all components for the Lycoming O-235 aircraft engine. It includes detailed illustrations to aid in the identification and procurement of parts. While this catalog focuses on parts, it is essential to consult official Lycoming Service Information Letters and Engine Manuals for specific maintenance procedures, recommended oil types, quantities, and service intervals, ensuring the continued airworthiness and optimal performance of your aircraft engine.