IO-240 Series Engine Installation & Operation Manual
2-1
31 October 2011
Engine Description
Chapter 2. Engine Description
2-1. General Engine Description
IO-240 engines are four-cylinder, four-stroke reciprocating aircraft engines. IO-240-A &
B engines are designed for fixed pitch, ground adjustable, or electric constant speed
propellers. There is no provision for a hydraulic propeller governor. Cylinder
displacement of 240 cubic inches is achieved with a 4.44 inch bore and a 3.88 inch stroke.
IO-240 series engines are equipped with continuous flow fuel injection and a either an
updraft or a downdraft induction system, depending on the engine model.
IO-240 series engines are designed with a wet sump, positive displacement oil pump
installed in the accessory case. When properly maintained, under normal operating
conditions, the desired oil pressure is maintained by a pressure relief valve located in the
accessory case. Engine cranking is accomplished by a geared starter mounted on the
accessory case.
A gear driven alternator is installed on the accessory case. The engine is equipped with
two gear-driven magnetos. The downdraft exhaust system is supplied by the airframe
manufacturer.
IO-240 series engines have a doweled, six bolt propeller flange.
Содержание IO-240-A
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