Lycoming YO-233-B2A - Connecting Rods - Parallelism and Squareness Check

TEO-540-A1A Engine Maintenance Manual
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Page 128 February 2021
YO-233-B2A Engine Maintenance Manual
14. Connecting Rods - Parallelism / Squareness Check
NOTICE: The Connecting Rod Parallelism and Squareness Gage P/N 64530 (Figure 29) is
necessary for this check.
Figure 29
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 30) 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 30.
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.
Figure 30
Parallelism Check of Connecting Rods
Figure 31
Squareness Check of Connecting Rods
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 parallelism measurement in the
Connecting Rod Inspection Checklist for YO-233-B2A Engines earlier in this chapter.
J. Remove the gage arm.