IO-390-D Series Engine Maintenance Manual
72-20
© 2020 Avco Corporation. All Rights Reserved
Page 144
March 2020
IO-390-D Series Engine Maintenance Manual
Crankshaft Inspection Checklist for IO-390-D Series Engines (Cont.)
Item
Comments
Findings/
Corrective Action
Done
Crankshaft Gear Inspection (Cont.)
Measure the diameter of the
pilot flange of the crankshaft
gear (Figure 29).
If the diameter of the pilot flange
is less than 2.125 in. (53.975
mm) do not install this gear on
the crankshaft. Replace the
crankshaft gear with a
serviceable crankshaft gear.
Measure dimensions on the
crankshaft gear per those shown
in Figure 29 for the respective
crankshaft gear part number.
Acceptable
Replace
Figure 29
Details for Crankshaft Gears to Current Configuration
Examine the crankshaft gear for
pitting and wear.
Replace a pitted or worn
crankshaft gear.
Acceptable
Replace
Examine the pilot flange
diameter of the crankshaft gear
for damage from galling or
fretting.
If the pilot flange of the
crankshaft gear is damaged,
replace the crankshaft gear.
Acceptable
Replace
If there is a hole or slot on the
crankshaft gear, examine the
slot for any nicks or dents.
If nicks or dents are found,
replace the crankshaft gear.
Acceptable
Replace
Complete a magnetic particle
inspection of the crankshaft
gear.
Refer to the “Non-Destructive
Testing” section in Chapter 05-
50.
Acceptable
Replace
