Crankshaft - Kubota SM-E3B Series Workshop Manual

SM-E3B SERIES WSM

(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.
Factory spec.
Crankshaft side
clearance
Allowable limit
(Reference)
• Oversize thrust bearing
Oversize Bearing
Thrust bearing 1 02
0.20 mm
0.0079 in.
Thrust bearing 2 02
Thrust bearing 1 04
0.40 mm
0.016 in.
Thrust bearing 2 04
• Oversize dimensions of crankshaft journal
0.20 mm
Oversize
0.0079 in.
46.10 to 46.30 mm
Dimension A
1.815 to 1.822 in.
23.40 to 23.45 mm
Dimension B
0.9213 to 0.9232 in.
1.8 to 2.2 mm radius
Dimension C
0.071 to 0.086 in. radius
The crankshaft journal must be fine-finished to higher than ∇∇∇∇.
Crankshaft Alignment
1. Support the crankshaft with V blocks on the surface plate at both
end journals.
2. Set a dial indicator with its tip on the intermediate journal.
3. Measure the crankshaft alignment.
4. If the measurement exceeds the allowable limit, replace the
crankshaft.
Crankshaft alignment Allowable limit
S-64
DIESEL ENGINE
0.15 to 0.31 mm
0.0059 to 0.012 in.
0.50 mm
0.020 in.
Code Number Marking
15261-23950 020 OS
15261-23970 020 OS
15261-23960 040 OS
15261-23980 040 OS
0.40 mm
0.016 in.
46.30 to 46.50 mm
1.823 to 1.830 in.
23.80 to 23.85 mm
0.9370 to 0.9389 in.
1.8 to 2.2 mm radius
0.071 to 0.086 in. radius
(0.8S)
W11586190
0.02 mm
0.0008 in.
W11613530
KiSC issued 03, 2011 A