Kubota G23, Workshop Manual

Page: 137 / 343

ENGINE
G23, G26, WSM
1-S55 (EU)
Connecting Rod Alignment
NOTE
• Since the I.D. of the connecting rod small end bushing is
the basis of this check, check bushing for wear
beforehand.
1. Install the piston pin into the connecting rod.
2. Install the connecting rod on the connecting rod alignment tool.
3. Put a gauge over the piston pin, and move it against the face
plate.
4. If the gauge does not fit squarely against the face plate,
measure the space between the pin of the gauge and the face
plate.
5. If the measurement exceeds the allowable limit, replace the
connecting rod.
9Y1210272ENS0081US0
Piston Ring Gap
1. Insert the piston ring into the lower part of the cylinder (the least
worn out part) with a piston.
2. Measure the ring gap with a thickness gauge.
3. If the measurement exceeds the allowable limit, replace the
piston ring.
[G23]
[G26]
9Y1210294ENS0073US0
Connecting rod
alignment
Allowable limit
0.05 mm
0.002 in.
Piston ring gap
Top ring
Factory
specifica-
tion
0.20 to 0.35 mm
0.0079 to 0.013 in.
Allowable
limit 1.25 mm
0.0492 in.
Second
ring
Factory
specifica-
tion
0.35 to 0.50 mm
0.014 to 0.019 in.
Allowable
limit 1.25 mm
0.0492 in.
Oil ring
Factory
specifica-
tion
0.20 to 0.35 mm
0.0079 to 0.013 in.
Allowable
limit 1.25 mm
0.0492 in.
Piston ring gap
Top ring
Factory
specifica-
tion
0.30 to 0.45 mm
0.012 to 0.017 in.
Allowable
limit 1.25 mm
0.0492 in.
Second
ring
Factory
specifica-
tion
0.30 to 0.45 mm
0.012 to 0.017 in.
Allowable
limit 1.25 mm
0.0492 in.
Oil ring
Factory
specifica-
tion
0.25 to 0.40 mm
0.0099 to 0.015 in.
Allowable
limit 1.25 mm
0.0492 in.
KiSC issued 08, 2009 A