Kubota B1830, Workshop Manual

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ENGINE B1830,B2230,B2530,B3030, WSM
1-S65
(5) Cylinder
Cylinder Wear
1. Measure the I.D. of the cylinder at the six positions (see figure)
with a cylinder gauge to find the maximum and minimum I.D.'s.
2. Get the difference (Maximum wear) between the maximum and
the minimum I.D.'s.
3. If the wear exceeds the allowable limit, bore and hone to the
oversize dimension. (Refer to "Correcting Cylinder".)
4. Visually check the cylinder wall for scratches. If deep scratches
are found, the cylinder should be bored. (Refer to "Correcting
Cylinder".)
9Y1210003ENS0108US0
Correcting Cylinder
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
2. Replace the piston and piston rings with oversize ones.
Oversize: 0.5 mm (0.0197 in.)
NOTE
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
9Y1210003ENS0109US0
Cylinder I.D.
Factory
specifica-
tion
D905-E2
72.000 to 72.019 mm
2.8346 to 2.8354 in.
D1005-E2
76.000 to 76.019 mm
2.9921 to 2.9929 in.
D1105-E2
V1505-E2 78.000 to 78.019 mm
3.0709 to 3.0716 in.
Allowable
limit
D905-E2
72.15 mm
2.8406 in.
D1005-E2
76.15 mm
2.9980 in.
D1105-E2
V1505-E2 78.15 mm
3.0768 in.
(A) Top
(B) Middle
(C) Bottom (Skirt) (a) Right-angled to Piston Pin
(b) Piston Pin Direction
Oversized cylinder
liner I.D.
Factory
specifica-
tion
D905-E2
72.500 to 72.519 mm
2.85433 to 2.85507 in.
D1005-E2
76.500 to 76.519 mm
3.0118 to 3.0126 in.
D1105-E2
V1505-E2 78.500 to 78.519 mm
3.0906 to 3.0913 in.
Allowable
limit
D905-E2
72.65 mm
2.8602 in.
D1005-E2
76.65 mm
3.0177 in.
D1105-E2
V1505-E2 78.65 mm
3.0965 in.
Finishing
Finishing
Hone to 1.2 to 2.0 mm µR max.
(0.000047 to 0.000079 in. µR max.)
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. (Oversize)
KiSC issued 05, 2012 A