Kubota M105S, Workshop Manual

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1-S72
M105S, WSM ENGINE
(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”.)
W1069784
Correcting Cylinder (Ov0.5 mm)
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 (0.5 mm) ones.
NOTE
■
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
W1070275
Cylinder Bore I.D.
Factory spec.
100.000 to 100.022 mm
3.9370 to 3.9379 in.
Allowable limit
100.15 mm
3.9429 in.
A : Top
B : Middle
C : Bottom (Skirt) (a) Right-angled to Piston Pin
(b) Piston Pin Direction
Cylinder Bore I.D. (2) Factory spec.
100.500 to 100.522 mm
3.9567 to 3.9576 in.
Maximum wear Allowable limit
100.65 mm
3.9626 in.
Finishing
Horn to 1.2 to 2.0 mm
μ
R max.
∇∇∇∇
(0.000047 to 0.000079 in.
μ
R max.)
(1) Cylinder I.D. (Before Correction) (2) Oversize Cylinder I.D.
KiSC issued 03, 2007 A