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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
12. Connecting Rod Inspection
Copy and complete the Connecting Rod Inspection Checklist is used to record the condition of
all of the connecting rods and any corrective action.
Connecting Rod Inspection Checklist for YO-233-B2A Engine Models
Engine Serial Number:_________________________ Engine Time:______________________
Date Inspection Done: ____________________ Inspection done by:______________________
Task or Inspection
Disassemble the connecting rod; clean
the rod and its cap thoroughly. Visually
examine the connecting rod for damage.
Examine the connecting rod bore for
wear.
Examine the mating face of the
connecting rod and its cap face for
fretting (Figure 24).
Use a 6-power magnifying glass
(minimum) or bench microscope to
examine the critical areas on the
connecting rod identified in Figure 24
for galling.*
* Do not mistake stains or discoloration for galling. Surface blemishes are easily removed with a
fine abrasive cloth, chemical cleaner or steel wool. Whereas, galling cannot be removed. If galling
is found in the bearing bore, replace the connecting rod. If surface blemishes cannot be removed
with a fine abrasive cloth, chemical cleaner or steel wool, there is evidence of galling. Gall marks
vary in size and shape. Some gall marks can be as small as pin heads. Other gall marks can be
circular, oval, or thin, or look like rods.
Areas on Connecting Rod to Examine for Fretting and Galling
© 2021 Avco Corporation. All Rights Reserved
February 2021
Measurements, Findings and/or Corrective Action
If the rod bore is worn, replace the connecting rod
assembly.
o Rod bore not worn
If fretting is found, replace the connecting rod
assembly.
o No fretting
If galling is found, replace the connecting rod assembly.
o No galling
Figure 24
o Worn rod bore/connecting rod
replaced
o Fretting found/connecting rod
replaced
o Galling found/connecting rod
replaced
72-30
Page 123
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