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 TM 55-1905-220-14-5
3-81. AIR CLEANER.
a. The air cleaner is designed to remove foreign matter from the air, pass the required volume of air for proper
combustion and maintain their efficiency for a reasonable period of time before requiring service.
b. The importance of keeping dirt and grit laden air out of an engine cannot be overemphasized since clean air is so
essential to satisfactory engine operation and long engine life. The air cleaner must be able to remove fine materials
such as dust as well as coarse materials as lint from the air. It must also have a reservoir capacity large enough to retain
the material separated from the air to permit operation for a reasonable period before cleaning and servicing are
required.
c. The light duty, oil bath type air cleaner, consists essentially of a wire screen element supported inside a
cylindrical housing which contains an oil bath directly below the element. Air drawn through the cleaner passes over the
top of the oil bath. The air stream direction reverses when the air impinges on the oil in the sump and is then directed
upwards by baffles. During this change in the direction of air flow, much of the foreign matter is trapped by the oil and is
carried to the sump where it settles out. The air passes upward through the metal-wool elements where more dust and
the entrained oil are removed. A second change of air direction at the top of the cleaner directs the air downward
through the center tube and into the blower inlet housing.
3-1389
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