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Item to Examine and Corrective
Action
Look for discolored/burnt paint or
scored cylinder barrel bores. Look for
blistered paint on the cylinder barrel.
Corrective Action:
Replace the cylinder if the cylinder
barrel bores are scored or if the paint
is discolored/burnt/ blistered.
Examine the threads in all threaded
holes in the cylinder for debris or
damage.
Corrective Action:
Use the correct size bottoming tap to
clean the threads.
If thread damage cannot be corrected
with the tap, replace the cylinder.
Examine the exhaust flange for
damage or warping.
Corrective Action:
Replace the cylinder if the exhaust
flange is warped or damaged.
Do not grind or repair the exhaust
flange to correct a bent or warped
flange.
Look for any radial fin crack
extending to the root of a fin.
Corrective Action:
Replace the cylinder if there is a
radial fin crack extending to the root
of the fin.
72-30
Page 210
Cylinder Assembly Inspection Checklist (Cont.)
Cylinder
No.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Findings / Corrective Action
© 2020 Avco Corporation. All Rights Reserved
March 2020
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