Kubota WSM STV32 Workshop Manual page 130

STV32 · STV36 · STV40, WSM
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 each direction as shown in the figure.
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.
A Never insert the plastigage into the crankpin oil hole.
A Be sure not to move the crankshaft while the connecting
rod screws are tightened.
Factory spec.
Oil clearance between
crankpin and crankpin
bearing
Allowable limit
Crankpin O.D. Factory spec.
Crankpin bearing I.D. Factory spec.
(Reference)
A Undersize dimensions of crankpin
0.2 mm
Undersize
0.008 in.
3.3 to 3.7 mm radius
Dimension A
0.1299 to 0.1457 in. radius
1.0 to 1.5 mm radius
Dimension B
0.0394 to 0.0591 in. radius
46.759 to 46.775 mm dia.
Dimension C
1.84091 to 1.84154 in. dia.
The crankpin must be fine-finished to higher than
1-S58
ENGINE
0.025 to 0.087 mm
0.00098 to 0.00343 in.
0.2 mm
0.0079 in.
46.959 to 46.975 mm
1.84878 to 1.84941 in.
47.000 to 47.046 mm
1.85039 to 1.85220 in.
0.4 mm
0.016 in.
3.3 to 3.7 mm radius
0.1299 to 0.1457 in. radius
1.0 to 1.5 mm radius
0.0394 to 0.0591 in. radius
46.559 to 46.575 mm dia.
1.83303 to 1.83366 in. dia.
(0.8-S)
0000006461E
KiSC issued 04, 2006 A