Oil Clearance Between Crankpin And Crankpin Bearing - Kubota B2410 Workshop Manual

1 ENGINE
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B2410 • B2710 • B2910 WSM, 12271
Oil Clearance between Crankpin and Crankpin Bearing
1. Clean the crankpin and crankpin bearing.
2. Put a strip of plastigage (Code No. 07909-30241) 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 plastigage into the crankpin oil hole.
• Be sure not to move the crankshaft while the connecting
rod screws are tightened.
Factory spec.
0.029 to 0.091 mm
Oil clearance between
0.00114 to 0.00358 in.
crankpin and crankpin
0.20 mm
bearing
Allowable limit
0.0079 in.
Crankpin 0.0. Factory spec.
39.959 to 39.975 mm
1.57319 to 1.57382 in.
Crankpin bearing 1.0. Factory spec.
40.004 to 40.050 mm
1.57496 to 1.57677 in.
(Reference)
• Undersize crankpin bearing
Undersize Bearing
Code Number Marking
0.2mm
Crankpin bearing 02 16241-22971 020 US
0.008 in.
OAmm
Crankpin bearing 04
16241-22981
040 US
0.016 in.
• Undersize dimensions of crankpinl
~
0.2mm OAmm
Dimension
0.008 in. 0.016 in.
A
2.8 to 3.2 mm radius 2.8 to 3.2 mm radius
0.1102 to 0.1260 in.radius
0.1102 to 0.1260 in.radius
B
1.0 to 1.5 mm radius 1.0 to 1.5 mm radius
0.0394 to 0.0591 in. radius
0.0394 to 0.0591 in. radius
C
39.759 to 39.775 mm 39.559 to 39.575 mm
1.56531 to 1.56594 in. 1.55744 to 1.55807 in.
~.8-~
The crankpin must be fine-finished to higher than VV .
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