wsm Kubota L4100, Workshop Manual

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ENGINE L4100, WSM
1-S54
(EU)
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 1
1. Measure the O.D. of the crankshaft journal with an outside
micrometer.
2. Measure the I.D. of the crankshaft bearing 1 with an inside
micrometer, and calculate oil clearance.
3. If the clearance exceeds the allowable limit, replace the
crankshaft bearing 1.
4. 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.
(Reference)
• Undersize dimensions of crankshaft journal
9Y1210278ENS0087US0
Replacing Crankshaft Bearing 1
(When removing)
1. Press out the used crankshaft bearing 1 using a crankshaft
bearing 1 replacing tool.
(When installing)
1. Clean a new crankshaft bearing 1 and crankshaft journal bore,
and apply engine oil to them.
2. Using a crankshaft bearing 1 replacing tool, press in a new
bearing 1 (2) so that its seam (1) directs toward the exhaust
manifold side.
9Y1210278ENS0114US0
Oil clearance between
crankshaft journal and
crankshaft bearing 1
Factory specification
0.0400 to 0.118 mm
0.00158 to 0.00464 in.
Allowable limit
0.20 mm
0.0079 in.
Crankshaft journal O.D. Factory specification
59.921 to 59.940 mm
2.3591 to 2.3598 in.
Crankshaft bearing 1 I.D. Factory specification
59.980 to 60.039 mm
2.3615 to 2.3637 in.
Undersize
0.2 mm
0.008 in.
0.4 mm
0.02 in.
Dimension A
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
*Dimension B
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
Dimension C
59.721 to 59.740 mm dia.
2.3513 to 2.3519 in. dia.
59.521 to 59.540 mm dia.
2.3434 to 2.3440 in. dia.
The crankshaft journal must be fine-finished to higher than Rmax = 0.8S
Crankshaft bearing 1
dimension
(A)
Factory specification
4.20 to 4.50 mm
0.166 to 0.177 in.
(1) Seam
(2) Crankshaft Bearing 1
(3) Cylinder Block (A) Dimension
KiSC issued 08, 2012 A