Crankshaft - Kubota WG972-E2 Workshop Manual

WG972-E2, DF972-E2, WSM

(4) Crankshaft

Crankshaft Side Clearance
1. Set a dial indicator with its tip on the end of the crankshaft.
2. Measure the side clearance by moving the crankshaft to the front
and rear.
3. If the measurement exceeds the allowable limit, replace the
thrust bearings.
4. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an oversize one referring to the table
and figure.
Factory spec.
Crankshaft side
clearance
Allowable limit
(Reference)
• Oversize thrust bearing
Oversize Bearing
Thrust bearing 1 02
0.2 mm
0.008 in.
Thrust bearing 2 02
Thrust bearing 1 04
0.4 mm
0.016 in.
Thrust bearing 2 04
• Oversize dimensions of crankshaft journal
Oversize
46.1 to 46.3 mm
Dimension A
1.815 to 1.823 in.
23.40 to 23.45 mm
Dimension B
0.9134 to 0.9154 in.
1.8 to 2.2 mm radius
Dimension C
0.071 to 0.087 in. radius
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.
Crankshaft Alignment
1. Support the crankshaft with V blocks on the surface plate at both
end journals.
2. Set a dial indicator with its tip on the intermediate journal.
3. Measure the crankshaft alignment.
4. If the measurement exceeds the allowable limit, replace the
crankshaft.
Crankshaft alignment Allowable limit
S-60
GASOLINE / LPG ENGINE
0.15 to 0.31 mm
0.0059 to 0.0122 in.
0.50 mm
0.0197 in.
Code Number
15261-23950
15261-23970
15261-23960
15261-23980
0.2 mm
0.008 in.
46.3 to 46.5 mm
1.823 to 1.831 in.
23.80 to 23.85 mm
0.9213 to 0.9232 in.
1.8 to 2.2 mm radius
0.071 to 0.087 in. radius
(0.8S)
0.02 mm
0.0008 in.
Marking
020 OS
020 OS
040 OS
040 OS
0.4 mm
0.016 in.
W1066738
W1067285
KiSC issued 01, 2006 A