This manual covers the Lycoming IO-540, a robust 6-cylinder, horizontally opposed, air-cooled aircraft engine designed for aviation propulsion. Manufactured by Lycoming Aircraft Engines, this naturally aspirated engine features a 541.5 cubic inch displacement, a 5.25-inch bore, and a 4.375-inch stroke, with a compression ratio of 8.70:1. It is engineered for reliability and performance, utilizing fuel injection and requiring Aviation Gasoline (Avgas). This engine represents a significant component in aviation technology, built to exacting standards for demanding flight operations.

The purpose of this Parts Manual Deluxe is to provide comprehensive information for the Lycoming IO-540 aircraft engine. It details essential components, specifications, and maintenance guidance, including recommended oil types. This document is an indispensable resource for owners, mechanics, and technicians, offering the necessary data to identify parts, understand technical specifications, and ensure the continued optimal performance and longevity of the engine. It is designed for easy access and use across various operating systems.