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Item to Examine and Corrective
Action
Examine mounting pads (for intake
and exhaust ports) for nicks, scoring
or dents.
Corrective Action:
Replace all nicked, scored, or dented
mounting pads for intake and exhaust
ports.
Examine mounting pads for rocker
box covers for nicks, scoring or dents.
Corrective Action:
Replace all nicked, scored, or dented
mounting pads for rocker box covers.
Examine the spark plug Heli-Coil
inserts for looseness or damage.
Corrective Action:
Replace all loose or damaged spark
®
plug Heli-Coil
inserts with oversize
inserts per the "Heli-Coil
Replacement" procedure in this
chapter.
Examine studs on the cylinder head
for looseness or damage.
Corrective Action:
Replace all loose or damaged studs
with the next higher applicable
oversize studs.
Measure the inside diameter of the
rocker shaft bushings. Refer to the
latest revision of the Service Table of
Limits - SSP 1776 for dimensions.
Corrective Action:
Replace the rocker shaft bushings if
they are not in accordance with
specifications.
72-30
Page 212
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
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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