wsm Kubota L4100, Workshop Manual

Page: 127 / 346

ENGINE L4100, WSM
1-S55
(EU)
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 2
1. Put a strip of plastigauge on the center of the journal.
2. Install the bearing case and tighten the baring case screws 1 to
the specified torque, and remove the bearing case again.
3. Measure the amount of the flattening with the scale and get the
oil clearance.
4. If the clearance exceeds the allowable limit, replace the
crankshaft bearing 2.
5. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an undersize one referring to the
table and figure.
NOTE
• Be sure not to move the crankshaft while the bearing case
screws are tightened.
(Reference)
• Undersize dimensions of crankshaft journal
9Y1210278ENS0089US0
Oil clearance between
crankshaft and
crankshaft bearing 2
Factory specification
0.0400 to 0.104 mm
0.00158 to 0.00409 in.
Allowable limit
0.20 mm
0.0079 in.
Crankshaft journal O.D. Factory specification
59.921 to 59.940 mm
2.3591 to 2.3598 in.
Crankshaft bearing 2 I.D. Factory specification
59.980 to 60.025 mm
2.3615 to 2.3631 in.
Undersize
0.2 mm
0.008 in.
0.4 mm
0.02 in.
Dimension A
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
*Dimension B
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
Dimension C, D
59.721 to 59.740 mm dia.
2.3513 to 2.3519 in. dia.
59.521 to 59.540 mm dia.
2.3434 to 2.3440 in. dia.
The crankshaft journal must be fine-finished to higher than Rmax = 0.8S
KiSC issued 08, 2012 A