Kubota WG972-E2 Workshop Manual page 131

WG972-E2, DF972-E2, WSM
Oil Clearance between Crankpin and Crankpin Bearing
1. Clean the crankpin and crankpin bearing.
2. Put a strip of plastigage 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.
Oil clearance between
crankpin and crankpin
bearing
Allowable limit
Crankpin O.D. Factory spec.
Crankpin bearing I.D. Factory spec.
(Reference)
• Undersize crankpin bearing
Undersize Bearing
0.2 mm
Crankpin bearing 02
0.008 in.
0.4 mm
Crankpin bearing 04
0.016 in.
• Undersize dimensions of crankpin
Undersize
2.3 to 2.7 mm radius
Dimension A
0.091 to 0.106 in.radius
1.0 to 1.5 mm relief
*Dimension B
0.0394 to 0.0591 in. relief
33.759 to 33.775 mm dia.
Dimension C
1.32910 to 1.32973 in. dia.
The crankshaft journal must be fine-finished to higher than ∇∇∇∇.
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm
(0.0394 to 0.0591 in.) relief.
S-61
GASOLINE / LPG ENGINE
0.020 to 0.051mm
0.00079 to 0.00201 in.
0.15 mm
0.0059 in.
33.959 to 33.975 mm
1.33697 to 1.33760 in.
33.995 to 34.010 mm
1.33839 to 1.33898 in.
Code Number
15861-22970
15861-20980
0.2 mm
0.008 in. 0.016 in.
2.3 to 2.7 mm radius
0.091 to 0.106 in.radius
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
33.559 to 33.575 mm dia.
1.32122 to 1.32185 in. dia.
(0.8S)
KiSC issued 01, 2006 A
Marking
020 US
040 US
0.4 mm
W11625390