Kubota B1220, Workshop Manual

Page: 118 / 343

ENGINE
B1220, B1620, B1820, WSM
1-S49 (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 ring compressor and piston.
2. Measure the ring gap with a feeler gauge.
3. If the measurement exceeds the allowable limit, replace the
piston ring.
9Y1210272ENS0082US0
Connecting rod
alignment
Allowable limit
0.05 mm
0.002 in.
Piston ring gap
Top ring
Factory
specifica-
tion
0.15 to 0.30 mm
0.0059 to 0.011 in.
Allowable
limit 1.20 mm
0.0472 in.
Second
ring
Factory
specifica-
tion
0.30 to 0.45 mm
0.012 to 0.017 in.
Allowable
limit 1.20 mm
0.0472 in.
Oil ring
Factory
specifica-
tion
0.15 to 0.30 mm
0.0059 to 0.011 in.
Allowable
limit 1.20 mm
0.0472 in.
KiSC issued 07, 2011 A