wsm Kubota L4100 Workshop Manual page 123

L4100, WSM
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 ring.
Top ring
Piston Ring Gap Second ring
Oil ring
Clearance between Piston Ring and Groove
1. Clean the rings and the ring grooves, and install each ring in its
groove.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance exceeds the allowable limit, replace the piston
ring.
4. If the clearance still exceeds the allowable limit with new ring,
replace the piston.
Factory specification
Second ring
Allowable limit
Factory specification
Oil ring
Allowable limit
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
1-S51
ENGINE
Factory
0.25 to 0.40 mm
specifica-
0.0099 to 0.015 in.
tion
Allowable 1.25 mm
limit 0.0492 in.
Factory
0.30 to 0.45 mm
specifica-
0.012 to 0.017 in.
tion
Allowable 1.25 mm
limit 0.0492 in.
Factory
0.25 to 0.45 mm
specifica-
0.0099 to 0.017 in.
tion
Allowable 1.25 mm
limit 0.0492 in.
9Y1210278ENS0080US0
0.0930 to 0.128 mm
0.00367 to 0.00503 in.
0.20 mm
0.0079 in.
0.020 to 0.060 mm
0.00079 to 0.0023 in.
0.15 mm
0.0059 in.
9Y1210278ENS0081US0
0.05 mm
0.002 in.
9Y1210278ENS0082US0
KiSC issued 08, 2012 A
(EU)