IO-390-D Series Engine Maintenance Manual
72-30
© 2020 Avco Corporation. All Rights Reserved
Page 210
March 2020
IO-390-D Series Engine Maintenance Manual
Cylinder Assembly Inspection Checklist (Cont.)
Item to Examine and Corrective
Action
Cylinder
No.
Findings / 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.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
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.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
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.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
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.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
