6
7
5
4
TM 9-4940-568-34
7-28
7-5. CRANKSHAFT AND BEARINGS REPLACEMENT (CONT).
NOTE
Step (5) determines main bearing
clearance.
(5)
Measure crankshaft main journal diameters
at locations shown by arrows.
DIAMETER
MIN.
3.2662 in. (82.961 mm)
MAX.
3.2682 in. (83.012 mm)
OUT-OF-ROUNDNESS
0.002 in. (0.05 mm)
TAPER
0.0005 in. (0.013 mm)
Main bearing clearance =
Main bore diameter with bearing
installed minus crankshaft main
journal diameter.
MAIN BEARING CLEARANCE MAX.
0.00475 in. (0.1206 mm)
(6)
Inspect all main bearing caps (4) and main
bearing crankshaft journals (5).
(7)
Determine the size of the upper main
bearing (6) and lower main bearing (7)
removed and obtain same size for
installation.
(8)
Refer to chart for dimensions of the standard
and undersize main bearing crankshaft
journals (5).
