Kubota D1803-CR-E4, Workshop Manual

Page: 284 / 309

2. If the cylinder wear is more than the service limit,
bore and hone it to the specified dimension.
NOTE
• If the maximum I.D. or the difference for the
oversize cylinder is more than the service
limit, replace the crankcase with a new one.
• Oversize cylinder bore I.D.
Oversize cylinder
I.D.
Service specifi-
cation 87.250 to 87.272 mm
3.4351 to 3.4359 in.
Service limit
87.420 mm
3.4417 in.
Difference be-
tween maximum
I.D. and minimum
I.D.
Service limit
0.15 mm
0.0059 in.
Finishing
Hone to 1.4 to 2.2 μmRz (0.000056 to
0.000086 in.Rz)
(1) Cylinder bore I.D. (Before
Correction)
(2) Cylinder bore I.D. (Oversize)
3. Replace the piston and piston rings with oversize
ones.
Oversize piston
and piston rings Service specifi-
cation 0.25 mm
0.0098 in.
RELATED PAGE
7.38 Checking cylinder wear on page 4-183
7.40 Checking clearance between
inner rotor and outer rotor
Tools required
• Feeler gauge
1. Measure the clearance between the lobes of the
inner rotor and the outer rotor with a feeler gauge.
NOTE
• If the clearance more than the service limit,
replace the oil pump rotor assembly.
Clearance be-
tween inner rotor
and outer rotor
Service specifi-
cation 0.030 to 0.14 mm
0.0012 to 0.0055 in.
Service limit
0.2 mm
0.008 in.
7.41 Checking clearance between
outer rotor and pump body
Tools required
• Feeler gauge
4. ENGINE
SERVICING
7. Servicing
4-184
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A