Kubota B1830, Workshop Manual

Page: 160 / 548

ENGINE B1830,B2230,B2530,B3030, WSM
1-S59
Oil Clearance between Piston Pin and Small End Bushing
1. Measure the piston pin O.D. where it contacts the bushing with
an outside micrometer.
2. Measure the small end bushing I.D. with an inside micrometer,
and calculate the oil clearance.
3. If the oil clearance exceeds the allowable limit, replace the
bushing. If it still exceeds the allowable limit, replace the piston
pin.
9Y1210003ENS0097US0
Replacing Small End Bushing
(When removing)
1. Press out the used bushing using a small end bushing replacing
tool. (See page "SPECIAL TOOLS".)
(When installing)
1. Clean a new small end bushing and bore, and apply engine oil
to them.
2. Using a small end bushing replacing tool, press in a new
bushing (service parts) taking care to see that the connecting
rod oil hole matches the bushing hole.
9Y1210003ENS0098US0
Oil clearance between
piston pin and small end
bushing
Factory specification
0.014 to 0.038 mm
0.00055 to 0.00150 in.
Allowable limit
0.15 mm
0.0059 in.
Piston pin O.D. Factory specification
22.002 to 22.011 mm
0.8662 to 0.8666 in.
Small end bushing I.D. Factory specification
22.025 to 22.040 mm
0.8671 to 0.8677 in.
Oil clearance between
piston pin and small end
bushing (Spare parts)
Factory specification
0.015 to 0.075 mm
0.00059 to 0.00295 in.
Allowable limit
0.15 mm
0.0059 in.
Small end bushing I.D.
(Spare parts)
Factory specification
22.026 to 22.077 mm
0.7885 to 0.7904 in.
(1) Seam
(2) Oil Hole (A) When Removing
(B) When Installing
(a) 0.785 rad (45 °)
KiSC issued 05, 2012 A