Crankshaft Inspection - Lycoming TEO-540-C1A Maintenance Manual

6. Crankshaft Inspection

A. Before cleaning the crankshaft, initially examine the crankshaft trigger gear assembly and
crankshaft inner diameter and external surface for evidence of pitting and wear. These
conditions are of particular importance when they occur on the involutes of the crankshaft
trigger gear assembly teeth. Replace the crankshaft trigger gear assembly if there is any
pitting or wear.
B. Clean the crankshaft per "Crankshaft Cleaning," "Crankshaft Counterbore Cleaning," and
"Crankshaft Trigger Gear Assembly Cleaning" procedures in Chapter 05-30. Prior to
inspection, the crankshaft counterbore must be clean, dry, and free of debris. Make a copy of
the Crankshaft Inspection Checklist for TEO-540-C1A Engines to record the condition of the
crankshaft and any corrective action.
C. Clean the hollow inner diameter bore of the crankshaft (Figure 22) with mineral spirits, MIL-
PRF-680 or equivalent or Stoddard Solvent. Prior to inspection, the crankshaft inner diameter
must be clean, dry, and free of debris.
D. Continue with the crankshaft inspection. Do not make scores, scratches, or etch markings of
any kind on the crankshaft. A mark in any of these areas can cause the crankshaft to weaken
and to possibly fail.
Crankshaft Inspection Checklist for TEO-540-C1A Engines
Engine Serial Number:_____________________Engine Time:____________________________
Date Inspection Done: _____________________Inspection done by:_______________________
Item
Carefully examine all surfaces
of the crankshaft for cracks,
gouges, nicks, dents, or
damage.
Complete a magnetic particle
inspection on the crankshaft.
Examine the crankshaft
bearing surfaces.
Examine the counterbored
mounting surface of the
crankshaft for cracks, gouges,
nicks, dents, or damage.
72-20
Page 142
Comments
If a crack is found, replace the
crankshaft. Do NOT try to repair
a cracked or damaged
crankshaft.
Refer to the "Non-Destructive
Testing" section in Chapter 05-50.
Refer to the "Crankshaft Bearing
Surface Inspection" section in this
chapter.
If a crack, gouge, nick, dent, or
damage is found, replace the
crankshaft. Do NOT try to repair
a cracked, gouged, nicked,
dented, or damaged crankshaft
counterbore.
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TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Findings/
Corrective Action
Acceptable
Replace
Acceptable
Replace
Done
November 2018