This manual provides comprehensive information for the Lycoming 0-235 and 0-290 aircraft engines, designed for aviation applications. These reciprocating engines, with displacements of 235 and 290 cubic inches respectively, are known for their robust engineering and reliability. The 0-235 model delivers 108 horsepower, while the 0-290 model offers 125 horsepower, both utilizing Aviation Gasoline (Avgas) as fuel. Lycoming Engines, the manufacturer, has engineered these powerplants to meet the demanding standards of the aviation industry.

The purpose of this Overhaul Manual is to serve as an authoritative guide for the maintenance, repair, and overhaul of Lycoming 0-235 and 0-290 engines. It covers essential procedures, technical specifications, and safety guidelines necessary for ensuring the continued airworthiness and optimal performance of these aircraft engines. This document is intended for use by aircraft owners, mechanics, and technicians, providing detailed instructions on lubrication, inspection schedules, and service intervals, all in English.