Kubota M6800S Workshop Manual page 145

M6800 · M6800S · M8200 · M9000, WSM
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing
1. Clean the crankshaft journal and crankshaft bearing.
2. Put a strip of press gauge (Code No.: 07909-30241) on the
center of the journal.
IMPORTANT
• Never insert the press gauge into the oil hole of the journal.
3. Install the main bearing case and tighten the screws to the
specified torque, and remove the cases 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.
6. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an undersize one referring to the
table and figure.
Crankshaft journal O.D. Factory spec.
Oil clearance between
crankshaft journal and Factory spec.
crankshaft bearing
(Reference)
• Undersize crankshaft bearing
Undersize Bearing
0.2 mm
Crankshaft bearing 02
0.008 in.
0.4 mm
Crankshaft bearing 04
0.016 in.
• Undersize dimensions of crankshaft journal.
Undersize
0.2 mm
0.008 in.
Dimension
2.8 to 3.2 mm radius
A
0.1102 to 0.1260 in. radius
1.0 to 1.5 mm radius
B
0.0394 to 0.0591 in. radius
74.777 to 74.790 mm dia.
C
2.9440 to 2.9445 in. dia.
The crankpin must be fine-finished to higher than ∇∇∇∇.
Replacing Crankshaft Sleeve
1. Remove the used crankshaft sleeve (1) using a special-use puller
set (Code No.: 07916-09032).
2. Set the sleeve guide (4) to the crankshaft (2).
3. Heat a new sleeve to a temperature between 150 to 200 °C (302
to 392 °F), and fix the sleeve to the crankshaft as shown in figure.
4. Press fit the sleeve using the auxiliary socket for pushing (3).
NOTE
• Mount the sleeve with its largely chamfered surface facing
outward.
(1) Crankshaft Sleeve
(2) Crankshaft
1-S60
ENGINE
74.977 to 74.990 mm
2.9518 to 2.9524 in.
0.018 to 0.062 mm
0.0007 to 0.0024 in.
Code Number Marking
1C020-23910 020 US
1C020-23920 040 US
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 radius
0.0394 to 0.0591 in. radius
74.577 to 74.590 mm dia.
2.9361 to 2.9366 in. dia.
(0.8-S)
W1069159
(3) Auxiliary Socket for Pushing
(4) Sleeve Guide
W1069911
KiSC issued 03, 2008 A