Kubota MX5100 Workshop Manual page 162

MX5100, WSM
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.
Factory spec.
Oil clearance between
crankshaft journal and
crankshaft bearing 1
Allowable limit
Crankshaft journal O.D. Factory spec.
Crankshaft bearing 1
Factory spec.
I.D.
(Reference)
• Undersize dimensions of crankshaft journal
Undersize
2.8 to 3.2 mm radius
Dimension A
0.11 to 0.12 in. radius
1.0 to 1.5 mm relief
*Dimension B
0.040 to 0.059 in. relief
59.721 to 59.740 mm dia.
Dimension C
2.3513 to 2.3519 in. dia.
The crankshaft journal must be fine-finished to higher than ∇∇∇∇
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm
(0.040 to 0.059 in.) relief.
Replacing Crankshaft Bearing 1
(When removing)
1. Press out the used crankshaft bearing 1 using a crankshaft
bearing 1 replacing tool. (See page "SPECIAL TOOLS".)
(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. (See figure.)
Dimension (A) Factory spec.
(1) Seam
(2) Crankshaft Bearing 1
1-S70
0.0400 to 0.118 mm
0.00158 to 0.00464 in.
0.20 mm
0.0079 in.
59.921 to 59.940 mm
2.3591 to 2.3598 in.
59.980 to 60.039 mm
2.3615 to 2.3637 in.
0.2 mm 0.4 mm
0.008 in. 0.02 in.
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
59.521 to 59.540 mm dia.
2.3434 to 2.3440 in. dia.
(0.4S)
4.20 to 4.50 mm
0.166 to 0.177 in.
(3) Cylinder Block
(A) Dimension
ENGINE
W1033717
W1033946