Kubota D1803-CR-E4, Workshop Manual

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2. Move the crankshaft to the front and rear to
measure the side clearance.
NOTE
• If the measurement is more than the service
limit, replace the thrust bearings.
• If the same dimension bearing is not
applicable because of the crankshaft journal
wear, replace it with an oversize one. Refer
to the table and figure.
Side clearance of
crankshaft
Service specifi-
cation 0.15 to 0.31 mm
0.0059 to 0.012 in.
Service limit
0.50 mm
0.020 in.
(Reference)
• Oversize dimensions of crankshaft journal
Oversize
0.2 mm
0.008 in.
0.4 mm
0.02 in.
Dimension A
54.50 to 54.70 mm
2.146 to 2.153 in. 54.60 to 54.80 mm
2.150 to 2.157 in.
Dimension B
26.20 to 26.25 mm
1.032 to 1.033 in. 26.40 to 26.45 mm
1.040 to 1.041 in.
Dimension C
2.8 to 3.2 mm radi-
us
0.11 to 0.12 in. radi-
us 2.8 to 3.2 mm radi-
us
0.11 to 0.12 in. radi-
us
The crankshaft journal must be fine-finished to higher than Rmax
= 0.4 S
A: Dimension A
B: Dimension B
C: Dimension C
7.31 Checking crankshaft alignment
Tools required
• V blocks
• Surface plate
• Dial gauge
1. Hold the two end journals of crankshaft with V
blocks on the surface plate.
2. Set a dial gauge with its point on the middle journal.
3. Turn the crankshaft slowly and read the variation on
the indicator. Half of the measured value is the
alignment value.
NOTE
• If the measurement is more than the service
limit, replace the crankshaft.
• If the crankshaft is replaced, it is necessary
to calibrate the injection timing with the
diagnosis tool.
Crankshaft align-
ment
Service limit
0.03 mm
0.001 in.
4. ENGINE
SERVICING
7. Servicing
4-178
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A