1-S58
BX24, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, 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
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.
W10367470
(6) Oil Pump
Rotor Lobe Clearance
1. Measure the clearance between lobes of the inner rotor and the
outer rotor with a thickness gauge.
2. If the clearance exceeds the factory specifications, replace the oil
pump rotor assembly.
W10378950
Cylinder liner I.D.
Factory spec.
72.000 to 72.019 mm
2.83464 to 2.83539 in.
Allowable limit
72.150 mm
2.84055 in.
(A) Top
(B) Middle
(C) Bottom (Skirt)
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
Cylinder liner I.D.
Factory spec.
72.250 to 72.269 mm
2.84449 to 2.84524 in.
Allowable limit
72.400 mm
2.85040 in.
Finishing
Hone to 2.2 to 3.0 mRz.
(0.000087 to 0.00012 in.Rz)
(1) Cylinder I.D. (Before Correction) (2) Cylinder I.D. [Oversize]
Rotor lobe clearance Factory spec.
0.03 to 0.14 mm
0.0012 to 0.0055 in.
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