Kubota WG972-E2 Workshop Manual page 132

WG972-E2, DF972-E2, WSM
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 1
1. Measure the O.D. of the crankshaft front journal with an outside
micrometer.
2. Measure the I.D. of the crankshaft bearing 1 with an inside
micrometer, and calculate the oil clearance.
3. If the oil 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 the figure.
Factory spec.
Oil Clearance between
crankshaft journal and
crankshaft bearing 1
Allowable limit
Crankshaft journal O.D.
Factory spec.
Crankshaft bearing 1 I.D.
(Reference)
• Undersize crankshaft bearing 1
Undersize Bearing
0.2 mm
Crankshaft bearing 1 02
0.008 in.
0.4 mm
Crankshaft bearing 1 04
0.016 in.
• Undersize dimensions of crankshaft journal
Undersize
1.8 to 2.2 mm radius
Dimension A
0.071 to 0.087 in.radius
1.0 to 1.5 mm relief
*Dimension B
0.0394 to 0.0591 in. relief
43.734 to 43.750 mm dia.
Dimension C
1.72181 to 1.72244 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
(0.0394 to 0.0591 in.) relief.
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. (See figure.)
Dimension (A) Factory spec.
(1) Seam
(2) Crankshaft Bearing 1
(3) Cylinder Block
S-62
GASOLINE / LPG ENGINE
0.034 to 0.106 mm
0.00134 to 0.00417 in.
0.20 mm
0.0079 in.
43.934 to 43.950 mm
1.72968 to 1.73031 in.
43.984 to 44.040 mm
1.73165 to 1.73386 in.
Code Number
1G460-23910
1G460-23920
0.2 mm
0.008 in. 0.016 in.
1.8 to 2.2 mm radius
0.071 to 0.087 in.radius
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
43.534 to 43.550 mm dia.
1.71394 to 1.71457 in. dia.
(0.8S)
0.0 to 0.3 mm
0.0 to 0.0118 in.
(A) Dimension
(a) 0.366 rad (21 °)
Marking
020 US
040 US
0.4 mm
W10323470
W10342000
KiSC issued 01, 2006 A