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Crankshaft Inspection Checklist for IO-390-D Series Engines (Cont.)
Item
Crankshaft Gear Inspection (Cont.)
Measure the diameter of the
pilot flange of the crankshaft
gear (Figure 29).
Measure dimensions on the
crankshaft gear per those shown
in Figure 29 for the respective
crankshaft gear part number.
Details for Crankshaft Gears to Current Configuration
Examine the crankshaft gear for
pitting and wear.
Examine the pilot flange
diameter of the crankshaft gear
for damage from galling or
fretting.
If there is a hole or slot on the
crankshaft gear, examine the
slot for any nicks or dents.
Complete a magnetic particle
inspection of the crankshaft
gear.
72-20
Page 144
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Comments
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.
Figure 29
Replace a pitted or worn
crankshaft gear.
If the pilot flange of the
crankshaft gear is damaged,
replace the crankshaft gear.
If nicks or dents are found,
replace the crankshaft gear.
Refer to the "Non-Destructive
Testing" section in Chapter 05-
50.
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Findings/
Corrective Action
Acceptable
Replace
Acceptable
Replace
Acceptable
Replace
Acceptable
Replace
Acceptable
Replace
March 2020
Done
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