Lycoming IO-390-D Series Maintenance Manual page 179

IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Connecting Rod Inspection Checklist for IO-390-D Series Engines (Cont.)
Item
Measure the Inner
Diameter (ID) of
the connecting
rod bushing using
a micrometer
(Figure 35)
Figure 35
Connecting Rod
Complete the "Connecting Rods - Parallelism /
Squareness Check" in this chapter.
Measure the distance between arbors (Figure 40).
For exact parallelism or alignment, the distances
measured on both sides are to be the same.
Measure clearance at the points where the arbors
rest on the parallel blocks (Figure 41) using a
feeler gage. Compare the clearance between each
arbor and the parallel blocks against the values in
the latest revision of the Service Table of Limits -
SSP-1776.
© 2020 Avco Corporation. All Rights Reserved
March 2020
Comments
If the connecting rod bushing
is worn beyond service limits
per the latest revision of the
Service Table of Limits -
SSP-1776, replace the
bushing.
Findings/Corrective Action
Bushing ID Measurement
Connecting Rod 1
Connecting Rod 2
Connecting Rod 3
Connecting Rod 4
For connecting rods that pass the Visual
Inspection herein, complete a Magnetic
Particle Inspection on all connecting rods as
per the "Non-Destructive Testing" section in
Chapter 05-50.
Findings/ Corrective Action of
Magnetic Particle Inspection
Connecting Rod 1 Acceptable
Replace
Acceptable
Connecting Rod 2
Replace
Acceptable
Connecting Rod 3
Replace
Connecting Rod 4 Acceptable
Replace
Parallelism
Measurement
Connecting
Rod 1
Connecting
Rod 2
Connecting
Rod 3
Connecting
Rod 4
Done
Done
Squareness
Measurement
72-20
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