TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Crankshaft (001-016)
Section 1 - Cylinder Block - Group 01
Page 1-49
Use a micrometer to measure the connecting rod journal.
Connecting Rod Bearing Journal Diameter
mm
in
Standard
68.987
MIN
2.716
Machined 0.25 mm
68.737
MIN
2.706
Machined 0.50 mm
68.487
MIN
2.696
Machined 0.75 mm
68.237
MIN
2.687
Machined 1.00 mm
67.987
MIN
2.677
Bearing Clearance = Connecting rod inside diameter with
bearing installed minus crankshaft journal diameter.
Maximum Bearing Clearance: 0.117 mm [0.0046 in].
Connecting Rod Bearing Journal
mm
in
Out-of-Roundness
0.050
MAX
0.0020
Taper
0.013
MAX
0.0005
Main Bearing Journal Diameter
mm
in
Standard
82.987
MIN
3.267
Machined 0.25 mm
82.737
MIN
3.257
Machined 0.50 mm
82.487
MIN
3.248
Bearing Clearance = Main bore diameter with bearing
installed minus (-) crankshaft main journal diameter.
Maximum Bearing Clearance: 0.13 mm [0.005 in].
Crankshaft Main Bearing Journal
mm
in
Out-of-Roundness
0.05
MAX
0.0020
Taper
0.01
MAX
0.0004
The following oversize service main and thrust bearings
are available for crankshafts that have been machined
undersize:
Thrust Size
Oversize
0.000
0.25 mm
0.50 mm
Journal
0.000
X
X
X
Diameter
0.25 mm
X
X
0.50 mm
X
X
0.75 mm
X
1.00 mm
X
L-727
