Kubota M5040, Workshop Manual

Page: 195 / 559

1-S69
M5040, M6040, M7040, WSM ENGINE
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing
1. Clean the crankshaft journal (2) and crankshaft bearing.
2. Put a strip of press gauge on the center of the journal.
IMPORTANT
Q
• Never insert the press gauge into the oil hole of the journal.
3. Install the crankcase 2 (1) and tighten the crankcase 2 mounting
screws to the specified torque, and remove the crankcase 2 (1)
again.
4. Measure the amount of the flattening with the scale and get the
oil clearance.
5. If the clearance exceeds the allowable limit, replace the
crankshaft bearing.
(Reference)
• Undersize dimensions of crankshaft journal.
W1069159
Crankshaft journal O.D. Factory spec.
79.977 to 79.990 mm
3.1487 to 3.1492 in.
Oil clearance between
crankshaft journal and
crankshaft bearing
Factory spec.
0.030 to 0.073 mm
0.0012 to 0.0029 in.
Allowable limit
0.20 mm
0.0079 in.
Undersize
0.2 mm
0.008 in. 0.4 mm
0.016 in.
Dimension A
2.8 to 3.2 mm radius
0.1102 to 0.1260 in. radius 2.8 to 3.2 mm radius
0.1102 to 0.1260 in. radius
*Dimension B
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief 1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
Dimension C
79.777 to 79.790 mm dia.
3.1408 to 3.1413 in. dia. 79.577 to 79.590 mm dia.
3.1330 to 3.1335 in. dia.
(0.8S)
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.
(1) Crankcase 2
(2) Crankshaft Journal (3) Crankcase 1
KiSC issued 06, 2008 A