Kubota M9540, Workshop Manual, Page: 196 / 619

1-S73
M8540, M9540, WSM ENGINE
Oil Clearance of Balancer Shaft Journal
1. Measure the balancer shaft journal O.D. with an outside
micrometer.
2. Measure the cylinder block bore I.D. (A) , (B) for balancer shaft
with an inside micrometer.
3. If the clearance exceeds the allowable limit, replace the balancer
shaft.
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(3) Piston and Connecting Rod
Piston Pin Bore I.D.
1. Measure the piston pin bore I.D. in both the horizontal and
vertical directions with a cylinder gauge.
2. If the measurement exceeds the allowable limit, replace the
piston.
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Clearance between Piston Ring and Groove
1. Remove carbon from the ring grooves.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance exceeds allowable limit, check the new ring since
compression leak and oil shortage result.
4. If clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
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Oil clearance of
balancer-shaft journal
Factory spec.
0.070 to 0.159 mm
0.00276 to 0.00625 in.
Allowable limit
0.2 mm
0.008 in.
Balancer-shaft journal
O.D.
Factory spec.
50.92 to 50.94 mm
2.0047 to 2.0055 in.
Balancer-shaft bearing
I.D.
(A), (B)
Factory spec.
51.01 to 51.08 mm
2.008 to 2.011 in.
(A) Balancer-shaft Bearing I.D. (B) Balancer-shaft Bearing I.D.
Piston pin bore I.D.
Factory spec.
30.000 to 30.013 mm
1.1811 to 1.1816 in.
Allowable limit
30.05 mm
1.183 in.
Factory spec.
Top ring
0.05 to 0.09 mm
0.002 to 0.003 in.
Second ring
0.0930 to 0.120 mm
0.00367 to 0.00472 in.
Oil ring
0.020 to 0.060 mm
0.00079 to 0.0023 in.
Allowable limit
Top ring
0.15 mm
0.0059 in.
Second ring
0.20 mm
0.0079 in.
Oil ring
0.15 mm
0.0059 in.
KiSC issued 09, 2008 A