Kubota RTV1140CPX, Workshop Manual

Page: 135 / 379

ENGINE
RTV1140CPX, WSM
1-S52
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 2 (Crankshaft Bearing 3)
1. Put a strip of plastigage on the center of the journal.
2. Install the bearing case and tighten the bearing 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 and crankshaft bearing.
5. If the same size bearing is still loose 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
9Y1210293ENS0096US0
Oil clearance between
crankshaft journal and
crankshaft bearing 2
Factory specification
0.034 to 0.095 mm
0.0014 to 0.0037 in.
Allowable limit
0.20 mm
0.0079 in.
Crankshaft journal O.D.
(Intermediate)
Factory specification
47.934 to 47.950 mm
1.8872 to 1.8877 in.
Crankshaft bearing 2 I.D. Factory specification
47.984 to 48.029 mm
1.8892 to 1.8909 in.
Oil clearance between
crankshaft journal and
crankshaft bearing 3
Factory specification
0.0340 to 0.103 mm
0.0013 to 0.0038 in.
Allowable limit
0.20 mm
0.0079 in.
Crankshaft journal O.D.
(Flywheel side)
Factory specification
51.921 to 51.940 mm
2.0442 to 2.0448 in.
Crankshaft bearing 3 I.D. Factory specification
51.974 to 52.024 mm
2.0463 to 2.0481 in.
Undersize
0.20 mm
0.0079 in.
0.40 mm
0.016 in.
Dimension A
2.3 to 2.7 mm radius
0.091 to 0.10 in. radius
2.3 to 2.7 mm radius
0.091 to 0.10 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
47.734 to 47.750 mm dia.
1.8793 to 1.8799 in. dia.
47.534 to 47.550 mm dia.
1.8715 to 1.8720 in. dia.
Dimension D
51.721 to 51.740 mm dia.
2.0362 to 2.0370 in. dia.
51.521 to 51.540 mm dia.
2.0284 to 2.0291 in. dia.
The crankshaft journal must be fine-finished to higher than Rmax=0.8S.
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm
(0.040 to 0.059 in.) relief.
KiSC issued 05, 2014 A