Cylinder - Kubota GL6000A-AU-B Workshop Manual

GL6000A-AU-B, GL6000D-AU-B,GL9000A-AU-B, GL9000D-AU-B, WSM

(5) Cylinder

Cylinder Wear
1. Measure the cylinder liner I.D. 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".)
Factory specification
Cylinder I.D.
Allowable limit
(A) Top
(B) Middle
(C) Bottom (Skirt)
Correcting Cylinder (Oversize)
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
Factory specification
Cylinder I.D. [Oversize]
Allowable limit
Hone to 2.2 to 3.0 µmRz.
Finishing
(0.000087 to 0.00011 in. Rz.)
2. Replace the piston and piston rings with oversize ones.
Oversize Part Name
0.25 mm
0.0098 in.
Piston ring assembly
NOTE
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
(1) Cylinder I.D. [Before Correction]
1-S57
67.000 to 67.019 mm
2.6378 to 2.6385 in.
67.169 mm
2.6444 in.
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
9Y1211607ENS0097US0
67.250 to 67.269 mm
2.6477 to 2.6483 in.
67.400 mm
2.6535 in.
Marking
Piston
(2) Cylinder I.D. [Oversize]
9Y1211607ENS0098US0
KiSC issued 06, 2016 A
ENGINE
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