Connecting Rod Alignment; Piston Ring Gap; Clearance Between Piston Ring And Groove - Kubota KX080-3 Workshop Manual

WSM KX080-3 Service

Connecting Rod Alignment

• NOTE
• Since the I.D. of the connecting rod small end bushing is the
basis of this check, check the bushing for wear beforehand.
1. Remove the piston pin from the piston.
2. Install the piston pin in the connecting rod.
3. Install the connecting rod on the connecting rod alignment tool.
4. Put a gauge over the piston pin, and move it against the face
plate.
5. If the gauge does not fit squarely against the face plate, measure
the space between the pin of the gauge and the face plate.
6. 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 liner (the least
worn out part) with the piston.
2. Measure the ring gap with a feeler gauge.
3. If the gap exceeds the allowable limit, replace the piston ring.
Factory spec.
Top ring and second ring
Allowable limit
Factory spec.
Oil ring
Allowable limit

Clearance between Piston Ring and Groove

1. Remove carbon from the ring grooves.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance exceeds allowable limit, check the new ring
since compression leak and oil shortage result.
4. If clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
Top ring
Factory spec. Second ring
Oil ring
Top ring
Allowable limit Second ring
Oil ring
III-S-157
Engine
0.05 mm
0.0020 in.
W1066581
0.30 to 0.45 mm
0.0118 to 0.0177 in.
1.25 mm
0.0492 in.
0.25 to 0.45 mm
0.0098 to 0.0177 in.
1.25 mm
0.0492 in.
W1066430
0.05 to 0.09 mm
0.0020 to 0.0035 in.
0.093 to 0.120 mm
0.0037 to 0.0047 in.
0.020 to 0.060 mm
0.0008 to 0.0023 in.
0.15 mm
0.0059 in.
0.20 mm
0.0079 in.
0.15 mm
0.0059 in.
W1066183