ENGINE
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, 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".)
9Y1210855ENS0086US0
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.
Oversize: 0.25 mm (0.0098 in.)
Marking: 025
• When the oversize cylinder is worn beyond the allowable
limit, replace the cylinder block with a new one.
9Y1210855ENS0087US0
Cylinder liner I.D.
Factory
specifica-
tion
BX1870D
(D722-E4)
67.000 to 67.019 mm
2.6378 to 2.6385 in.
BX2370D
(D902-E4)
72.000 to 72.019 mm
2.8347 to 2.8353 in.
BX2670D
(D1005-E4)
76.000 to 76.019 mm
2.9922 to 2.9928 in.
Allowable
limit
BX1870D
(D722-E4)
67.150 mm
2.6437 in.
BX2370D
(D902-E4)
72.150 mm
2.8406 in.
BX2670D
(D1005-E4)
76.15 mm
2.998 in.
(A) Top
(B) Middle
(C) Bottom (Skirt)
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
Cylinder liner I.D.
Factory
specifica-
tion
BX1870D
(D722-E4)
67.250 to 67.269 mm
2.6477 to 2.6483 in.
BX2370D
(D902-E4)
72.250 to 72.269 mm
2.8445 to 2.8452 in.
BX2670D
(D1005-E4)
76.500 to 76.519 mm
3.0119 to 3.0125 in.
Allowable
limit
BX1870D
(D722-E4)
67.400 mm
2.6535 in.
BX2370D
(D902-E4)
72.400 mm
2.8504 in.
BX2670D
(D1005-E4)
76.65 mm
3.018 in.
Finishing
Hone to 2.2 to 3.0 μm Rz
(87 to 110 μin. Rz)
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. (Oversize)
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