Cylinder Servicing; Oil Pump Servicing; Cylinder Wear; Correcting Cylinder (Oversize) - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service
(5) Cylinder
(6) Oil Pump

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".)
Factory spec.
Cylinder Bore 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.
Cylinder I.D. (2) Factory spec.
Maximum wear Allowable limit
Hone to 1.2 to 3.0 m Rz
Finishing
(0.000087 to 0.00012 in. Rz)
2. Replace the piston and piston rings with oversize 0.5 mm
(0.0197 in.) ones.
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 feeler gauge.
2. If the clearance exceeds the allowable limit, replace the oil pump
rotor assembly.
Factory spec.
Clearance between
inner rotor and outer
rotor
Allowable limit
III-S-162
100.00 to 100.022 mm
3.9370 to 3.9379 in.
100.15 mm
3.9429 in.
(a) Right-angled to piston pin
(b) Piston pin direction
W1070089
100.500 to 100.522 mm
3.9567 to 3.9576 in.
100.65 mm
3.9626 in.
(2) Oversize Cylinder I.D.
W10344480
0.04 to 0.16 mm
0.0016 to 0.0063 in.
0.3 mm
0.0118 in.
W1071254
Engine