Oil Pump - Kubota MX5100 Workshop Manual

MX5100, WSM

(6) Oil Pump

Correcting Cylinder (Oversize)
1. When the cylinder is worn beyond the allowable limit, bore and
hone it to the specified dimension.
Factory spec.
Oversize cylinder I.D.
Allowable limit
Hone to 2.2 to 3.0 μmRz
Finishing (0.000087 to 0.000118 in.Rz)
∇∇∇.
2. Replace the piston and piston rings with oversize ones.
Oversize : 0.25 mm (0.0098 in.)
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. Measure the clearance between the outer rotor and the pump
body with a feeler gauge.
3. If the clearance exceeds the factory specifications, replace the oil
pump rotor assembly.
Factory spec.
Clearance between
inner rotor and outer
rotor
Allowable limit
Factory spec.
Clearance between
outer rotor and pump
body
Allowable limit
Clearance between Rotor and Cover
1. Put a strip of plastigage onto the rotor face with grease.
2. Install the cover and tighten the screws.
3. Remove the cover carefully, and measure the width of the press
gauge with a sheet of gauge.
4. If the clearance exceeds the factory specifications, replace oil
pump rotor assembly.
Factory spec.
Clearance between
inner rotor and cover
Allowable limit
1-S73
ENGINE
87.250 to 87.272 mm
3.4351 to 3.4359 in.
87.420 mm
3.4417 in.
(2) Cylinder I.D. (Oversize)
W1034448
0.030 to 0.14 mm
0.0012 to 0.0055 in.
0.2 mm
0.008 in.
0.11 to 0.19 mm
0.0044 to 0.0074 in.
0.25 mm
0.0098 in.
W1035296
0.105 to 0.150 mm
0.00414 to 0.00590 in.
0.20 mm
0.008 in.
W1035444