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2. Complete the preservative oil removal procedure as follows:
A. If any of the dehydrator plugs (which contain crystals of silica gel) break and the crystals fall
into the engine, complete the following per the IO-390-D Series Engine Maintenance
Manual.
• Disassemble the affected portion of the engine.
• Clean the engine.
B. Remove desiccant bags.
C. Put a container under the engine to collect the cylinder preservative oil.
D. Remove the shipping plugs installed in the lower spark plug holes.
E. Remove the desiccant plugs from the upper spark plugs holes.
F. Turn the crankshaft through three or four complete revolutions to remove the cylinder
preservative oil from the cylinders.
G. Collect the cylinder preservative oil as it drains out of the lower spark plug holes.
H. Tilt the engine to one side until the spark plug holes on that side are vertical.
I. Turn the crankshaft two revolutions and let the oil drain out through the spark plug holes.
J. Tilt the engine to the other side until the spark plug holes on that side are vertical.
K. Turn the crankshaft two revolutions and let the oil drain out through the spark plug holes.
3. Examine the cylinder bores with a borescope for rust and contamination. Refer to the IO-390-D
Series Engine Maintenance Manual.
4. If any corrosion or unusual conditions are found, speak to Lycoming Engine's Service
Department.
5. Drain preservative oil from the oil sump:
A. Put a 15-quart (14-liter) capacity container under the oil sump.
B. Remove the safety wire/cable from both oil sump drain plugs. Discard the safety wire/cable.
C. Remove the oil sump drain plugs.
D. Drain the remaining preservative oil from the oil sump into the container.
NOTICE: If some preservative oil stays in the engine, it will not damage the engine. The
preservative oil will be removed after the first 25 hours of operation during the oil
change.
E. Remove, examine, clean, and reinstall the oil suction screen per the "Oil Suction Screen
Removal/Inspection/Cleaning/Installation" section in Chapter 12-10 of the IO-390-D Series
Engine Maintenance Manual.
F. Apply one to two drops of Loctite
install the oil sump drain plugs in the oil sump. Torque the drain plugs in accordance with the
latest revision of the Service Table of Limits - SSP-1776.
CAUTION
G. Safety wire/cable the two oil sump drain plugs and oil suction screen plug in accordance with
the standard practices per the latest revision of AC43.13-1B or the latest revision of Service
Instruction No. SI-1566.
Requirements for Engine Installation
Page 10
IO-390-D Series Engine Installation and Operation Manual
®
564
MAKE SURE THAT BOTH OIL SUMP DRAIN PLUGS AND THE
SUCTION SCREEN PLUG ARE INSTALLED TIGHTLY. IF THE DRAIN
PLUGS AND OIL SUCTION SCREEN PLUG ARE NOT TIGHTLY
INSTALLED AND LEAK, ENGINE FAILURE CAN OCCUR.
™
to the threads of each oil sump drain plug and
© 2020 Avco Corporation. All Rights Reserved
March 2020
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