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6. Pre-oil start cycle: Energize the starter for 10 to 15 seconds and look for evidence of oil
pressure of at least 20 psi (138 kPa) within 10 to 15 seconds.
If there is no oil pressure within 10 to 15 seconds, stop energizing the starter. Wait at least 30
seconds and repeat the pre-oil start cycle.
Up to six consecutive pre-oil start cycles can be done. Afterwards, let the starter cool for 30
minutes. If stable oil pressure is not achieved, stop pre-oiling and contact Lycoming Engines.
NOTICE: Unstable oil pressure or oil pressure less than 20 psi (138 kPa) could be an
indication of obstructed or interrupted oil flow or air in the oil lines.
7. If oil pressure of at least 20 psi (138 kPa) was sustained in the previous step, repeat the pre-
oil start cycle to make sure oil pressure holds stable and that there is no sudden drop in oil
pressure. If oil pressure is not stable or drops suddenly, stop pre-oiling, and contact
Lycoming Engines.
NOTICE: A new spark plug gasket must be installed whether a new or acceptable re-used
spark plug is to be installed.
8. Once the minimum oil pressure of 20 psi (138 kPa) is shown on the oil pressure gauge, re-
install the spark plugs, each with a new gasket in each cylinder as per instruction in Chapter
74-20 of the IO-390-D Series Engine Maintenance Manual.
9. Within 3 hours of completing the pre-oil procedure, complete the remaining steps in this
chapter, then start and operate the engine for 3 minutes at approximately 1000 rpm.
Step 13. Add Fuel
WARNING
DETONATION CAN OCCUR IF THE INCORRECT FUEL IS USED.
DETONATION CAN INCREASE ENGINE CYLINDER TEMPERAURE AND
PRESSURE AND CAUSE DAMAGE TO THE ENGINE.
Add the correct fuel. Refer to Appendix A or the latest revision of Service Instruction No. SI-1070
for approved fuels for this engine.
Step 14. Final Installation Inspection
Complete the Engine Installation Checklist at the end of this chapter.
Step 15. Close Engine Compartment
1. Make sure that there are no tools or unwanted materials in the engine or engine nacelle or
compartment.
2. Install all cowling and nacelle access panels to close the engine compartment securely. Refer
to the airframe manufacturer's instructions and specified torque values.
Engine Installation
Page 22
IO-390-D Series Engine Installation and Operation Manual
© 2020 Avco Corporation. All Rights Reserved
March 2020
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