Cylinder - Kubota GL6000 Workshop Manual

GL6000, GL7000, GL9000, GL11000, 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 spec.
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 spec.
Cylinder I.D.
[Oversize]
Allowable limit
Hone to 2.2 to 3.0 mRz.
Finishing 
(0.000087 to 0.00012 in. Rz.)
2. Replace the piston and piston rings with oversize ones.
Oversize Part Name
Piston
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
ENGINE
67.000 to 67.019 mm
2.63780 to 2.63854 in.
67.169 mm
2.64445 in.
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
W10360060
67.250 to 67.269 mm
2.64764 to 2.64839 in.
67.400 mm
2.65354 in.
Marking
025
025
(2) Cylinder I.D. [Oversize]
W10367470
KiSC issued 05, 2015 A