Crankshaft Installation - Lycoming TEO-540-C1A Maintenance Manual

23. Crankshaft Installation

CAUTION BEFORE INSTALLATION, MAKE SURE THE CRANKSHAFT HAS
SATISFACTORILY PASSED THE MAGNETIC PARTICLE INSPECTION
AND DOES NOT HAVE ANY CRACKS. DO NOT INSTALL A
CRANKSHAFT WITH A CRACK. ENGINE MALFUNCTION CAN OCCUR
IF A CRANKSHAFT WITH A CRACK IS INSTALLED.
NOTICE: The connecting rods are to have been already installed on the crankshaft per the
"Connecting Rod Installation" procedure in this chapter.
A. Refer to the latest revision of Service Instruction No. SI-1059 and apply the specified
lubricant to the main bearing journals of the crankshaft and the rear and center main bearing
inserts in the right crankcase half.
B. Install the Front Bearing Halves on the Crankshaft
(1) Apply a coating of engine oil mixture to the front bearing halves (Figure 13).
(2) Install the front bearing halves, where they touch (butt together) around the crankshaft.
(3) Lift the crankshaft assembly by the connecting rods. Lower the crankshaft assembly into
the crankcase half (Figure 88). Let the connecting rods extend through the cylinder base
openings in the crankcase half.
(4) With the crankshaft assembly in the crankcase, align the dowel holes in the front bearing
halves with the dowels in the crankcase.
(5) Make sure the two new front main bearings (Figure 13) are seated squarely over the
locating dowels on the crankcase.
C. Measure the Thrust Face Clearances Between the Crankshaft and Crankcase
(1) With the crankshaft installed in the crankcase, move the crankshaft as far forward as
possible.
(2) Use a feeler gage to measure the slinger clearance at Point A (Figure 89). Refer to the
limits in Table 3. If the slinger clearance is not within the limits in Table 3, the front face
of the slinger can be reground to restore the slinger clearance to within allowable limits.
(3) Move the crankshaft to the rear as far as possible.
72-20
Page 182
Figure 88
Crankshaft Installed in Crankcase Half
TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
© 2018 Avco Corporation. All Rights Reserved
November 2018