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3. Oil Consumption
NOTICE: To ensure accurate calculation of oil consumption, each time oil is added to the engine,
record the amount of oil added in the engine logbook.
A. Use the following formula to calculate the maximum allowable oil consumption limits for
this engine and record the value in the engine logbook. Compare this oil consumption value
to past oil consumption values.
WARNING
B. If engine oil serviced is consistently high or oil consumption has increased or is excessive:
(1) Complete the "Cylinder Borescope Inspection Procedure" in Chapter 72-30.
(2) Refer to Chapter 12-30 for corrective action to identify and correct the cause of the
excessive oil consumption before further flight.
4. Oil Type and Viscosity
A. The oils to be used in the IO-390-D Series engine are identified in Appendix A of the IO-
390-D Series Engine Installation and Operation Manual.
B. Refer to the latest revision of Service Instruction No. SI-1014 for additional details.
5. Add Oil to the Engine
NOTICE: Each time oil is added to the engine, record the quantity of oil added in the engine
logbook to calculate oil consumption.
A. Oil Additives
Refer to the latest revision of Service Instruction No. SI-1409 for quantity and instructions to add
the oil additive.
NOTICE: The approved oil, oil sump capacity, and the minimum quantity for engine operation
are identified in the latest revision of Service Instruction No. SI-1014 and Appendix
A of the IO-390-D Series Engine Installation and Operation Manual.
On new, rebuilt, or overhauled engines, during the first 50 hours of engine
operation, operate these engines with mineral oil until oil consumption has
stabilized. Afterwards, complete the "Oil Change Procedure" in this chapter.
B. To add oil to the IO-390-D Series engine:
Pull out the oil level gage assembly (dipstick) (Figure 1) from the oil level gage tube.
(1)
Add either new clean mineral oil (if within the first 50 hours of operation of a new,
(2)
rebuilt, or overhauled engine) or specified oil of the correct quantity and viscosity for the
ambient temperature (identified in Appendix A in the IO-390-D Series Engine
Installation and Operation Manual or the latest revision of Service Instruction No. SI-
1014) to the oil sump through the oil level gage tube.
12-10
Page 66
0.006 x BHP x 4 ÷ 7.4 = Qt./Hr.
ONCE BREAK-IN IS COMPLETE, IF OIL CONSUMPTION IS MORE
THAN THE CONSUMPTION RATES IN APPENDIX A OF THE IO-390-D
SERIES ENGINE INSTALLATION AND OPERATION MANUAL, THE
AIRCRAFT IS NOT TO BE IN FLIGHT. EXCESSIVE OIL
CONSUMPTION IS AN INDICATION OF A PROBLEM, SUCH AS OIL
LEAKS OR CYLINDER MALFUNCTION.
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
March 2020
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