Kubota WSM B2050 Workshop Manual page 145

B2050, B2350, B2650, B3150, WSM
Oil Clearance between Crankpin and Crankpin Bearing
1. Clean the crankpin and crankpin bearing.
2. Put a strip of plastigauge on the center of the crankpin.
3. Install the connecting rod cap and tighten the connecting rod
screws to the specified torque, and remove the cap again.
4. Measure the amount of the flattening with the scale, and get the
oil clearance.
5. If the oil clearance exceeds the allowable limit, replace the
crankpin bearing.
6. If the same size bearing is useless because of the crankpin
wear, replace it with an undersize one referring to the table and
figure.
NOTE
• Never insert the plastigauge into the crankpin oil hole.
• Be sure not to move the crankshaft while the connecting
rod screws are tightened.
Factory specification
Oil clearance between
crankpin and crankpin
bearing
Allowable limit
Crankpin O.D. Factory specification
Crankpin bearing I.D. Factory specification
(Reference)
• Undersize dimensions of crankpin
Undersize
2.8 to 3.2 mm radius
Dimension A
0.11 to 0.12 in. radius
1.0 to 1.5 mm relief
*Dimension B
0.040 to 0.059 in. relief
39.759 to 39.775 mm dia.
Dimension C
1.5654 to 1.5659 in. dia.
The crankpin 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.
1-S56
0.029 to 0.091 mm
0.0011 to 0.0036 in.
0.20 mm
0.0079 in.
39.959 to 39.975 mm
1.5732 to 1.5738 in.
40.004 to 40.050 mm
1.5750 to 1.5767 in.
0.20 mm 0.40 mm
0.0079 in. 0.016 in.
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
39.559 to 39.575 mm dia.
1.5575 to 1.5580 in. dia.
9Y1210982ENS0104US0
ENGINE
KiSC issued 03, 2014 A