Lycoming TEO-540-C1A Maintenance Manual page 170

Results of Fluorescent Penetrant Inspection of Crankcase
Crankcase P/N
Crankcase S/N
Inspection Item
Look for fatigue crack(s) or
start of crack(s) in the
crankcase
Look for cracks caused by heat
or brittleness
Look for inappropriate repair,
such as grinding to remove
corrosion in the crankcase.
Comments/Notes:
D. Crankcase Dimensional Inspection
The crankcase dimensional inspection is done to make sure that the crankshaft bearings and
camshaft bearing saddles (Figure 13) formed by the crankcase halves are within allowable limits.
Complete the crankcase dimensional inspection as follows:
(1) Install new crankshaft bearings at all main bearing locations in the crankcase halves
(Figure 13).
(2) Assemble the crankcase halves and install thru-studs (Figure 4).
(3) Use washers and nuts on the thru-studs to install the Torque Hold-Down Plates (ST-222,
Figure 83) at the cylinder pads over the thru-studs. Tighten the nuts only finger tight at
this time.
(a) Make sure that the Torque Hold-Down Plates remain parallel with the cylinder decks
of the crankcase.
(b) Temporarily torque the nuts to 300 in.-lb. (34 Nm).
(4) Attempt to insert a 0.004 in. tapered feeler gage between the crankcase mating faces. If
the gage will not enter between the crankcase parting faces, the crankcase is considered
satisfactory.
(5) Make a copy and complete the Crankcase Dimensional Inspection Checklist for TEO-
540-C1A Engines.
(6) Remove the nuts, washers, and Torque Hold-Down Plates (ST-222), and separate the
crankcase halves.
72-20
Page 140
Black Light Inspection of Crankcase
Guidelines and
Corrective Action
Start of cracks or crack(s)
found - replace both crankcase
halves
Evidence of grinding - replace
both crankcase halves
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
Inspector
Date of Inspection
Findings and Action Taken
Acceptable
Replace
Acceptable
Replace
© 2018 Avco Corporation. All Rights Reserved
November 2018