Kubota WSM F2880 Workshop Manual page 116

F2880, F3680, RCK72-F36, RCK72R-F36, RCK60-F36, RCK60R-F36, 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 clearance exceeds the allowable limit, replace the
crankshaft bearing 1.
4. If the same size bearing is still loose 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
0.008 in.
2.3 to 2.7 mm radius
Dimension A
0.0906 to 0.1063 in. radius
1.0 to 1.5 mm relief
*Dimension B
0.0394 to 0.0591 in. relief
47.734 to 47.750 mm dia.
Dimension C
1.8793 to 1.8799 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. (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) is toward the exhaust manifold
side. (See figure.)
Dimension (A) Factory spec.
(1) Seam
(2) Crankshaft Bearing 1
1-S50
0.034 to 0.114 mm
0.0013 to 0.0045 in.
0.20 mm
0.0079 in.
47.934 to 47.950 mm
1.8872 to 1.8878 in.
47.984 to 48.048 mm
1.8891 to 1.8916 in.
0.2 mm
2.3 to 2.7 mm radius
0.0906 to 0.1063 in. radius
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
47.534 to 47.550 mm dia.
1.8714 to 1.8720 in. dia.
(0.8-S)
0 to 0.3 mm
0 to 0.0118 in.
(3) Cylinder Block
ENGINE
0.4 mm
0.016 in.
W10337170
W10339460
KiSC issued 04, 2006 A