Kubota B1220 Workshop Manual page 118

B1220, B1620, B1820, WSM
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.
Connecting rod
Allowable limit
alignment
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.
Top ring
Second
Piston ring gap
ring
Oil ring
1-S49
ENGINE
0.05 mm
0.002 in.
9Y1210272ENS0081US0
Factory
0.15 to 0.30 mm
specifica-
0.0059 to 0.011 in.
tion
Allowable 1.20 mm
limit 0.0472 in.
Factory
0.30 to 0.45 mm
specifica-
0.012 to 0.017 in.
tion
Allowable 1.20 mm
limit 0.0472 in.
Factory
0.15 to 0.30 mm
specifica-
0.0059 to 0.011 in.
tion
Allowable 1.20 mm
limit 0.0472 in.
9Y1210272ENS0082US0
KiSC issued 07, 2011 A
(EU)