Kubota M5040 Workshop Manual page 195

M5040, M6040, M7040, WSM
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
• 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.
Crankshaft journal O.D. Factory spec.
Factory spec.
Oil clearance between
crankshaft journal and
crankshaft bearing
Allowable limit
(Reference)
• Undersize dimensions of crankshaft journal.
0.2 mm
Undersize
0.008 in.
2.8 to 3.2 mm radius
Dimension A
0.1102 to 0.1260 in. radius
1.0 to 1.5 mm relief
*Dimension B
0.0394 to 0.0591 in. relief
79.777 to 79.790 mm dia.
Dimension C
3.1408 to 3.1413 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.
(1) Crankcase 2
(2) Crankshaft Journal
1-S69
ENGINE
79.977 to 79.990 mm
3.1487 to 3.1492 in.
0.030 to 0.073 mm
0.0012 to 0.0029 in.
0.20 mm
0.0079 in.
0.4 mm
0.016 in.
2.8 to 3.2 mm radius
0.1102 to 0.1260 in. radius
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
79.577 to 79.590 mm dia.
3.1330 to 3.1335 in. dia.
(0.8S)
(3) Crankcase 1
W1069159
KiSC issued 06, 2008 A