TM 5-2420-230-24-2
Bearings, Main (001-006)
B3.9 and B5.9 Series Engines
Page 1-16
Section 1 - Cylinder Block - Group 01
Inspect the crankshaft journals for deep scratches, indi-
cations of overheating, and other damage.
NOTE: If the crankshaft journals or main caps are dam-
aged, the engine will need to be removed to complete the
overhaul.
Determine the size of the main bearing removed, and ob-
tain the same size for installation.
Refer to Procedure 001-016 for measurement specifica-
tions.
Refer to Base Engine Component Specifications for the
dimensions of the standard and undersize main bearing
journals.
Measure the installed main bearing bore diameter.
Main Bearing Bore Diameter (Maximum)
mm
in
83.106
MAX
3.272
Measure (001-006-010)
A damaged, worn, or missing thrust bearing flange on the
upper main bearing shell can be detected by measuring
the end play of the crankshaft.
Dimension (A) End Play Limits
mm
in
0.127
MIN
0.005
0.431
MAX
0.017
L-694