Lycoming TEO-540-C1A Maintenance Manual page 174

Crankshaft Inspection Checklist for TEO-540-C1A Engines (Cont.)
CAUTION LYCOMING ENGINES NO LONGER APPROVES STRAIGHTENING OR
GRINDING OF BENT CRANKSHAFT FLANGES TO RESTORE
MAXIMUM RUN-OUT. IF THE CRANKSHAFT FLANGE IS BENT,
REPLACE THE CRANKSHAFT. DO NOT TRY TO STRAIGHTEN OR
GRIND THE CRANKSHAFT FLANGE. (REFER TO THE LATEST
REVISION OF SERVICE BULLETIN NO. SB-201.)
Item
Measure the crankshaft flange
thickness and compare it with the
dimensions in Figures 23 and 24
to calculate the minimum
permissible thickness.
Crankshaft Flange Thickness
Inches Millimeters
0.440 ± 0.010 11.176 ± 0.254
Measure the run-out of the
crankshaft flange with a dial
indicator at the location shown in
Figures 23 and 24. The maximum
Total Indicator Reading (TIR)
must not be more than 0.005 in.
(0.127 mm). As shown in Figure
23, make sure that the pilot
diameter runs true with the front
and rear main bearings within
0.003 in. (0.076 mm).
Figure 23
Crankshaft Flange
72-20
Page 144
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Comments
If the crankshaft flange is
bent, replace the crankshaft.
Do NOT straighten or grind
a bent crankshaft. Refer to
the latest revision of Service
Bulletin No. SB-201 for any
additional details.
Inches Millimeters
0.420 10.668
If run-out exceeds 0.005 in.
(0.127 mm) Total Indicator
Reading, replace the
crankshaft.
Do not try to repair or grind
a warped or bent crankshaft
flange.
Crankshaft Flange Run-Out and Pilot Diameter
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Findings/
Corrective Action
Figure 24
November 2018
Done