Kubota EA330-E4 Series - Piston and Connecting Rod

ENGINE
EA330-E4, WSM
1-S50
(2) Piston and Connecting Rod
Piston Skirt O.D.
1. Measure the piston skirt O.D. with an outside micrometer.
(Measuring points are shown in the figure.)
2. If the measurement is less than the allowable limit, replace the
piston.
9Y1211018ENS0084US0
Piston Pin Bore
1. Measure the piston pin bore I.D. (lengthwise and widthwise of
the piston) with a cylinder gauge.
2. If the measurement exceeds the allowable limit, replace the
piston.
9Y1211018ENS0085US0
Oil Clearance between Piston Pin and Bushing
1. Measure the piston pin O.D. with an outside micrometer.
2. Measure the piston pin bushing I.D. with an inside micrometer,
and calculate the oil clearance.
3. If the clearance exceeds the allowable limit, replace the
bushing.
4. If the clearance still exceeds the allowable limit with new
bushing, replace the piston pin.
9Y1211018ENS0086US0
Piston skirt O.D.
Factory specification
76.925 to 76.945 mm
3.0286 to 3.0293 in.
Allowable limit
Cylinder liner I.D.
−0.25 mm
−0.0098 in.
Piston pin bore I.D.
Factory specification
20.000 to 20.013 mm
0.78741 to 0.78791 in.
Allowable limit
20.04 mm
0.7890 in.
Oil clearance between
piston pin and bushing
Factory specification
0.014 to 0.038 mm
0.00056 to 0.0014 in.
Allowable limit
0.15 mm
0.0059 in.
Piston pin O.D. Factory specification
20.002 to 20.011 mm
0.78748 to 0.78783 in.
Small end bushing I.D. Factory specification
20.025 to 20.040 mm
0.78839 to 0.78897 in.
KiSC issued 05, 2015 A