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IO-390-D Series Engine Installation and Operation Manual
Lubrication System
The lubrication system (Figure 8) includes a wet sump, oil pump, oil fill/dipstick, oil suction screen,
full flow oil filter or pressure screen, and oil lines.
There is a drain plug on the oil sump. Another plug on the oil sump is for removal of the oil suction
screen.
NOTICE: IO-390-D Series engines can be equipped with aluminum or magnesium oil sump or
accessory housing. Be aware of the type of components installed on your engine before
cleaning, completing maintenance, or replacing parts.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Figure 8
Lubrication System for IO-390-D Series Engines
System Description
Page 5
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