Oil Pump - Kubota SM-E4B Series Workshop Manual

SM-E4B SERIES, 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
specifica-
tion
Cylinder liner I.D.
Allowable
limit
Hone to 2.2 to 3.0 μm Rz
Finishing
(87 to 110 μin. 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 specification
Clearance between Outer Rotor and Pump Body
1. Measure the clearance between the outer rotor and the pump
body with a thickness gauge.
2. If the clearance exceeds the factory specifications, replace the
oil pump rotor assembly.
Clearance between outer
Factory specification
rotor and pump body
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 amount of the
flattening with the scale and get the clearance.
4. If the clearance exceeds the factory specifications, replace oil
pump rotor assembly.
Clearance between rotor
Factory specification
and cover
1-S68
ENGINE
Z482-E4B
67.250 to 67.269 mm
D722-E4B
2.6477 to 2.6483 in.
D782-E4B
Z602-E4B 72.250 to 72.269 mm
D902-E4B 2.8445 to 2.8452 in.
Z482-E4B
67.400 mm
D722-E4B
2.6535 in.
D782-E4B
Z602-E4B 72.400 mm
D902-E4B 2.8504 in.
(2) Cylinder I.D. [Oversize]
9Y1210785ENS0097US0
0.030 to 0.14 mm
0.0012 to 0.0055 in.
9Y1210785ENS0098US0
0.070 to 0.15 mm
0.0028 to 0.0059 in.
9Y1210785ENS0099US0
0.0750 to 0.135 mm
0.00296 to 0.00531 in.
9Y1210785ENS0100US0
KiSC issued 01, 2013 A