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IO-390-D Series Engine Installation and Operation Manual
3. Measure the oil level per the "Oil Level Check" procedure in Chapter 12-10 of the IO-390-D
Series Engine Maintenance Manual. Add more oil if necessary until the oil level in the
engine is sufficient for the flight conditions.
4. Install the oil level gage assembly (dipstick) into the oil level gage tube securely.
5. Record the amount of oil added to calculate oil consumption.
Step 12. Engine Pre-Oil Procedure
WARNING
IF THE PRE-OIL PROCEDURE IS NOT DONE, BEARING FAILURE CAN
OCCUR.
NOTICE: The purpose of the engine pre-oil procedure is to internally circulate oil through the
engine via a few turns of the engine propeller or crankshaft and ensure that oil pressure
is sustained which is an indication that there are no oil leaks.
Complete the engine pre-oil procedure on the engine at the following times:
• Before the initial start of a new, rebuilt, overhauled, or stored engine
or
• After oil cooler replacement or draining
or
• After any prolonged period of inactivity requiring preservation per the "Engine Preservation
and Storage" chapter in this manual
or
• Whenever the oil lines have been disconnected. Disconnect the oil inlet connection at the oil
pump and drain a sufficient amount of oil from the tank to be certain there are no obstructions
or air in the inlet line to the oil pump.
To complete the pre-oil procedure:
1. If not already done, fill the oil sump with clean engine oil to the correct level per the "Step
11. Add Oil to the Engine" in this chapter.
2. Make sure that the Ignition switch, the Auxiliary Fuel Pump switch, and the Fuel Selector are
all in the OFF position (as applicable to the aircraft configuration).
3. Fill the oil cooler with engine oil per the airframe manufacturer's instructions.
4. Per the "Spark Plug Removal" procedure in Chapter 74-20 of the IO-390-D Series Engine
Maintenance Manual, remove one spark plug from each cylinder of the engine. Remove and
discard the spark plug gasket.
NOTICE: Ensure that both Lycoming Electronic Ignition System units or both magnetos are
grounded during the pre-oil procedure.
5. Move the throttle control to the FULL OPEN position.
CAUTION
© 2020 Avco Corporation. All Rights Reserved
March 2020
DO NOT ENERGIZE THE STARTER FOR PERIODS OVER 10 TO 15
SECONDS. LET THE STARTER COOL FOR 30 SECONDS AFTER EACH
ENERGIZATION. IF THE STARTER FAILS TO ENERGIZE AFTER TWO
ATTEMPTS, IDENTIFY AND CORRECT THE CAUSE PER THE
AIRFRAME MANUFACTURER'S MAINTENANCE MANUAL.
Engine Installation
Page 21
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