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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
1. Refueling
CAUTION
ONLY USE APPROVED FUELS. DO NOT OPERATE THE ENGINE WITH
JET FUEL OR A LOWER OCTANE OR INCORRECT GRADE OF FUEL
BECAUSE IT CAN CAUSE UNUSUAL DETONATION WHICH COULD
DAMAGE THE ENGINE.
A. Refer to the latest revision of Service Instruction No. SI-1070 for approved fuels, octane
ratings, and the use of a higher grade fuel for this engine. Do not use any fuel that has a lower
octane rating than the fuel specified for your engine.
B. Refer to the aircraft manufacturer's manual for fuel capacity.
2. Oil Level Check
WARNING
DO NOT FLY THE AIRCRAFT IF THE OIL LEVEL IS LESS THAN THE
MINIMUM OIL LEVEL IDENTIFIED IN APPENDIX A OF THE IO-390-D
SERIES INSTALLATION AND OPERATION MANUAL. IF THE ENGINE
IS OPERATED WITH AN INSUFFICIENT OIL LEVEL, ENGINE DAMAGE
CAN OCCUR. REFER TO THE SECTION "OIL STARVATION/SUDDEN
LOSS OF OIL PRESSURE" IN CHAPTER 05-50.
A. The oil in the engine must be kept at the correct level for the engine to operate correctly.
B. Measure the oil level of an engine before every flight as follows:
(1) Pull out the oil level gage assembly (dipstick) from the oil level gage tube (Figure 1).
(2) Wipe all oil from the dipstick end with a clean, lint-free cloth. Do not let any lint or dirt
remain on the dipstick or get in the oil fill port.
(3) Insert the dipstick fully back into the oil level gage tube, threaded all the way down to the
oil sump and then remove the dipstick.
(4) Look at the oil level indication on the dipstick end.
NOTICE: The approved oil, oil sump capacity, and the minimum quantity for engine
operation are identified in Appendix A of the IO-390-D Series Engine
Installation and Operation Manual.
(5) If the oil level is not sufficient, add the correct oil through the fill port. Refer to the section
"Add Oil to the Engine" in this chapter.
C. Re-install the dipstick securely.
© 2020 Avco Corporation. All Rights Reserved
March 2020
12-10 - SERVICING - REPLENISHING
Figure 1
Oil Fill Tube and Oil Level Gage (Dipstick)
12-10
Page 65
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