IO-390-D Series Engine Maintenance Manual
© 2020 Avco Corporation. All Rights Reserved
72-10
March 2020
Page 115
IO-390-D Series Engine Maintenance Manual
Table 1 (Cont.)
Paint Stripping and Painting Guidelines for Components
Cylinder (Cont.)
(5)
Use a cloth dipped in paint thinner to remove paint from all surfaces where
it could have accidentally accumulated.
(6)
Air-dry the cylinder or bake the cylinder in an oven until completely dry.
Refer to the paint manufacturer’s instructions for drying time and oven
temperature.
(7)
Refer to Chapter 74-20 and paint the cylinder fin area appropriately for
spark plug identification.
3.
Limits and Clearances
Refer to the latest revision of
Service Table of Limits - SSP-1776
, for the following.
•
Backlash and end clearance of gears
•
Clearance between mating machined parts
•
Clearance between moving parts that touch
•
Torque limits for various nuts, screws, and fasteners.
4.
Inspections
NOTICE:
Inspections in this section refer to reusable items that do not require replacement in
accordance with the latest revision of Service Bulletin No. SB-240. Be sure to record
part replacement or any corrective action in the engine logbook.
A.
Bearing Surface Inspection
(1)
Examine all bearing surfaces for scoring, galling, and wear. If a part has one of the
defects, discard it and replace it with a new one.
(2)
Make sure that the clearance of each bearing agrees with the specification in the latest
revision of the
Service Table of Limits SSP-1776
.
•
If a bearing is not in the specified limits in the latest revision of the
Service Table of
Limit - SSP-1776
, discard it and replace it with a new one.
(3)
Examine all journal surfaces for galling, scores, misalignment, and out-of-round
condition. Replace a scored, galled, misaligned, or out-of-round component.
(4)
Examine the shafts and pins for straightness.
B.
Gear Inspection
(1)
Examine the involutes of the gear teeth for pitting and excessive wear.
•
If pit marks are found, discard the gear and replace it with a new one.
(2)
Examine the bearing surfaces of all gears for deep scratches.
(3)
Remove minor abrasions with a fine abrasive cloth.
C.
Screwed Fitting Inspection
(1)
Examine the condition of the threads on screwed fittings (threaded fastenings or plugs).
(2)
Remove small nicks and burrs with a small file, fine abrasive cloth, or stone.
•
If the part cannot be repaired by polishing it, discard it and replace it with a new one.
•
If the part has too much distortion, galling, or mutilation (caused by over-tightening
or use of an incorrect tool) replace it.
