1-S57
GL6000, GL7000, GL9000, GL11000, WSM
ENGINE
(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”.)
W10360060
Correcting Cylinder (Oversize)
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.
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
W10367470
Cylinder I.D.
Factory spec.
67.000 to 67.019 mm
2.63780 to 2.63854 in.
Allowable limit
67.169 mm
2.64445 in.
(A) Top
(B) Middle
(C) Bottom (Skirt)
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
Cylinder I.D.
[Oversize]
Factory spec.
67.250 to 67.269 mm
2.64764 to 2.64839 in.
Allowable limit
67.400 mm
2.65354 in.
Finishing
Hone to 2.2 to 3.0 mRz.
(0.000087 to 0.00012 in. Rz.)
Oversize Part Name Marking
0.25 mm
0.0098 in.
Piston 025
Piston ring assembly 025
(1) Cylinder I.D. [Before Correction] (2) Cylinder I.D. [Oversize]
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