TM-9-2815-205-34

ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

AUGUST 1992
TM-9-2815-205-34

  TM-9-2815-205-34 - Page 354 of 596

TM 9-2815-205-34
3-53. CRANKSHAFT MAINTENANCE (Cont)
CAUTION
Install upper and lower bearing
shells as a set. Do not replace
one main bearing shell alone.
Always install all new bearing
shells with new crankshaft.
NOT E
Lower bearing shells, which
carry the load, will normally
show signs of distress before
upper bearing shells.
(9) Discard main bearings with signs of
scoring, pitting, flaking, etching,
overheating, or loss of overlay.
e. Measurements
(1)
(2)
Using micrometer and ball attachment
(22), measure thickness of bearing shells
(11 and 14) at point (C), 90 degrees from
parting line. Replace if minimum
thickness is less than 0.1230 inch. A
standard bearing is 0.1240 to 0.1245 inch
thick. Refer to Table 3-9 for thickness of
bearings.
NOT E
If clearance between any
crankshaft journal and its
bearing shells exceeds 0.0060
inch, replace all bearing shells.
Clearance for new parts is
0.0010 to 0.0040 inch.
Check main bearings to crankshaft
journals clearance using step (a) or (b):
(a) With crankshaft removed, measure
outside diameter of crankshaft main
bearing journals and inside diameter
of main bearing shells in place with
required torque. When installed,
bearing shells are 0.001 inch larger in
diameter at parting line than 90
degrees from parting line.
TABLE 3-9. CRANKSHAFT BEARING
SHELL THICKNESS
BEARING
NEW BEARING
MINIMUM USED
SIZE
THICKNESS *
THICKNESS *
Standard
0.1240-0.1245 in.
0.1230 in.
(3.167-3.180 mm)
(3.124 mm)
0.002 in.
0.1250-0.1255 in.
0.1240 in.
Undersized
(3.175-3.188 mm)
(3.150 mm)
0.010 in.
0.1290-0.1295 in.
0.1280 in.
Undersized
(3.277-3.289 mm)
(3.251 mm)
0.020 in.
0.1340-0.1345 in.
0.1330 in.
Undersized
(3.404-3.416 mm)
(3.378 mm)
0.030 in.
0.1390-0.1395 in.
0.1380 in.
Undersized
(3.531-3.543 mm)
(3.505 mm)
*Thickness 90 degrees from parting line of bearing.
3-224


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