Kubota M108S, Workshop Manual

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1-S61
M108S, WSM ENGINE
(4) Crankshaft
Crankshaft Side Clearance
1. Set a dial indicator with its tip on the end of the crankshaft.
2. Measure the side clearance by moving the crankshaft to the front
and rear.
3. If the measurement exceeds the allowable limit, replace the
thrust bearings.
4. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an oversize one referring to the table
and figure.
(Reference)
• Oversize dimensions of crankshaft journal.
W1066738
Crankshaft Alignment
1. Support the crankshaft with V block on the surface plate and set
a dial indicator with its tip on the intermediate journal at right
angle.
2. Rotate the crankshaft on the V block and get the misalignment
(half of the measurement).
3. If the misalignment exceeds the allowable limit, replace the
crankshaft.
W1067285
Crankshaft side
clearance
Factory spec.
0.15 to 0.31 mm
0.0059 to 0.012 in.
Allowable limit
0.50 mm
0.020 in.
Oversize
0.2 mm
0.008 in. 0.4 mm
0.02 in.
Dimension A
169.10 to 169.15 mm
6.6575 to 6.6594 in. 169.20 to 169.25 mm
6.6615 to 6.6633 in.
Dimension B
29.20 to 29.25 mm
1.150 to 1.151 in. 29.40 to 29.45 mm
1.158 to 1.159 in.
Dimension C
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius 2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
(0.8S)
The crankshaft journal must be fine-finished to higher than
∇∇∇∇.
Crankshaft alignment Allowable limit
0.02 mm
0.0008 in.
KiSC issued 06, 2007 A