Connecting Rod Inspection - Lycoming TEO-540-C1A Maintenance Manual

12. Connecting Rod Inspection

Copy the Connecting Rod Inspection Checklist for TEO-540-C1A Engines to record the condition of
all of the connecting rods and any corrective action.
Connecting Rod Inspection Checklist for TEO-540-C1A Engines
Engine Serial Number:__________________________ Engine Time:_______________________
Date Inspection Done:_________________ Inspection done by:____________________________
Clean the connecting (Figure 33) rod and its cap thoroughly with mineral spirits. Visually examine
the connecting rod for damage. Replace a damaged connecting rod.
Task or Inspection
Examine the connecting rod bore for wear.
If the rod bore (Figure 32) is worn, replace
the connecting rod assembly.
Examine the mating face of the connecting
rod and its cap face for fretting (Figure 32).
If fretting is found, replace the connecting
rod assembly.
Use a 6-power magnifying glass
(minimum) or bench microscope to
examine the critical areas on the connecting
rod identified in Figure 32 for galling.*
If galling is found in areas in Figure 32,
replace the connecting rod assembly.
* 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, thin, or look like rods.
Areas on Connecting Rod to Examine for Fretting and Galling
72-20
Page 154
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Findings and/or Corrective Action
Cyl. 1 Cyl. 2 Cyl. 3
Acceptable Acceptable Acceptable
Replace Replace Replace
Acceptable Acceptable Acceptable
Replace Replace Replace
Acceptable Acceptable Acceptable
Replace Replace Replace
Figure 32
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Cyl. 4 Cyl. 5 Cyl. 6
Acceptable Acceptable Acceptable
Replace Replace Replace
Acceptable Acceptable Acceptable
Replace Replace Replace
Acceptable Acceptable Acceptable
Replace Replace Replace
November 2018