IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
72-30
March 2020
Page 209
IO-390-D Series Engine Maintenance Manual
9.
Cylinder Assembly Inspection
Copy and complete the Cylinder Assembly Inspection Checklist.
Cylinder Assembly Inspection Checklist
Engine Model Number:__________________Engine Serial Number:_____________________
Engine Hours: ___________________________Inspection Date:_________________________
Item to Examine and Corrective
Action
Cylinder
No.
Findings / Corrective Action
Look for wear or broken parts in the
area of the valve, springs, and spring
seats.
Corrective Action:
Replace the cylinder or send the engine
cylinder to an authorized vendor to
replace all loose, scored, pitted,
defective, or damaged valve seats
(Figure 15).
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Examine the intake and exhaust valve
seats for looseness, scoring, pitting
damage or non-conformities. Look for
cracked or eroded valve seat bores.
Corrective Action:
Replace the cylinder or send the engine
cylinder to an authorized vendor to
replace the valve seats.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Examine intake and exhaust valve
guides for looseness, cracks or scoring.
Corrective Action:
If the valve guide is loose, scored,
pitted, defective, or damaged, replace
the cylinder or send the cylinder to an
authorized vendor who can replace the
valve guide.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
Look for rust/pitting on:
•
Cylinder barrel fins and fin tips in
power stroke areas
•
Cylinder barrel and base flange
Corrective Action:
Replace the cylinder if rust/pitting is
found
Do not grind the cylinder bore
to
remove pitting or damage caused by
overheating.
Cylinder 1
Cylinder 2
Cylinder 3
Cylinder 4
