Cylinder; Oil Pump - Kubota BX24 Workshop Manual

BX24, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM

(5) Cylinder

(6) Oil Pump

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 liner I.D.
Allowable limit
(A) Top
(B) Middle
(C) Bottom (Skirt)
Correcting Cylinder
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
Factory spec.
Cylinder liner I.D.
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 : 0.25 mm (0.0098 in.)
Marking : 025

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)
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.
Rotor lobe clearance Factory spec.
1-S58
ENGINE
72.000 to 72.019 mm
2.83464 to 2.83539 in.
72.150 mm
2.84055 in.
(a) Right-angled to Piston Pin
(b) Piston Pin Direction
W10360060
72.250 to 72.269 mm
2.84449 to 2.84524 in.
72.400 mm
2.85040 in.
(2) Cylinder I.D. [Oversize]
W10367470
0.03 to 0.14 mm
0.0012 to 0.0055 in.
W10378950
KiSC issued 08, 2019 A