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13. If the front expansion plug is installed and a constant speed propeller is to be used:
A. Use a pointed punch tool to make a 1/8 in. to 3/16 in. hole in the center of the front
crankshaft plug.
B. Remove and discard the expansion plug from the crankshaft.
C. Since it is possible a little piece of expansion plug can fall off, look for and remove any
foreign object contamination.
14. Refer to Chapter 74-20 in the IO-390-D Series Engine Maintenance Manual to:
A. Examine the spark plugs.
B. If spark plugs are acceptable, install them with a new gasket. If the spark plugs are dirty,
clean them per the procedure in Chapter 05-30 of the IO-390-D Series Engine Maintenance
Manual. If the spark plugs are not acceptable, install new spark plugs with a new gasket.
C. Remove the protectors on the ignition lead ends.
D. Connect the ignition lead ends.
15. Remove the fuel inlet strainer from the throttle body and clean it with a hydrocarbon-based
solvent such as mineral spirits or equivalent and re-install the strainer on the throttle body.
16. Examine the fuel supply lines, fuel manifold, and throttle body to make sure they are clean and
dry.
17. Add specified oil per Appendix A. Refer to the "Add Oil" procedure in the "Engine Installation"
chapter in this manual.
18. Use the correct procedure for disposal of drained oil and fuel in accordance with local, state,
federal, and environmental protection regulations.
Step 2. Supply Interface Items
Table 2 contains available equipment options, recommendations and requirements for the airframe
manufacturer to prepare for engine installation.
and Requirements to Prepare the Engine for Installation
Issue
Electronic Ignition System
(EIS)
Magnetos (Optional)
Alternators
Cylinder head temperature
measurement
Requirements for Engine Installation
Page 14
IO-390-D Series Engine Installation and Operation Manual
Table 2
Optional Equipment, Recommendations,
Recommendation/Requirement
Refer to the "Lycoming Electronic Ignition System (EIS)" section in the
IO-390-D Series Engine Maintenance Manual.
Refer to the magneto manufacturer's documentation for information on
various vibrator and switching arrangements.
If different magnetos, other than those identified in Appendix A, are
necessary refer to the latest revision of Service Instruction No. SI-1443.
If a different alternator is necessary, refer to the latest revision of
Service Instruction No. SI-1154.
Airframe manufacturer-supplied bayonet thermocouples with AN5541
fittings for installation on each cylinder head.
© 2020 Avco Corporation. All Rights Reserved
March 2020
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