IO-390-D Series Engine Maintenance Manual
72-20
© 2020 Avco Corporation. All Rights Reserved
Page 156
March 2020
IO-390-D Series Engine Maintenance Manual
12.
Connecting Rods - Parallelism/Squareness Check
NOTICE:
The Connecting Rod Parallelism and Squareness Gage P/N 64530 (Figure 39) is
necessary for this check.
Figure 39
Connecting Rod Parallelism and Squareness Gage P/N 64530
A.
Make sure that the bearing cap is assembled correctly and is tightened securely.
B.
Insert the tapered sleeves (Figure 40) of the
Connecting Rod Parallelism and Squareness Gage
P/N 64530 in the bearing holes in the connecting
rod.
C.
Pull the arbors through the sleeves.
D.
Install the gage arm on the arbor as shown in
Figure 40.
E.
Turn the adjusting screw on the gage arm until it
just touches the arbor.
F.
Use the wing nut to lock the adjusting screw.
G.
Make sure the adjusting screw just touches the
arbor.
H.
Remove the gage arm and install it on the other
end of the arbor.
I.
Measure the distance between arbors. For exact
parallelism or alignment, the distances measured
on both sides must be the same. Record the
measurement in the Connecting Rod Inspection
Checklist earlier in this chapter.
J.
Remove the gage arm.
K.
Keep the sleeves and arbors in place.
L.
Put the parallel blocks (Figure 41) of the
Connecting Rod Parallelism and Squareness Gage
on the surface plate.
Figure 40
Parallelism Check of Connecting Rods
Figure 41
Squareness Check of Connecting Rods
