Kubota WSM L3540-II, Workshop Manual

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ENGINE L3540-II, L4240-II, L5040-II, L5240-II, L5740-II , WSM
1-S66
Replacing Connecting Rod Small End Bushing
(A) When removing
1. Push out the small end bushing with a connecting rod small end
bushing replacing tool.
(B) When installing
1. Clean a new small end bushing and bore, and apply engine oil
to them.
2. Install a new bushing. Make sure that the connecting rod hole
matches the bushing hole.
9Y1211167ENS0082US0
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.
9Y1211167ENS0083US0
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, replace the ring since
compression leak and oil shortage result.
4. If the clearance still exceeds the allowable limit after replacing
the ring, replace the piston.
9Y1211167ENS0084US0
(A) When Removing (B) When Installing
Top ring
Factory
specifica-
tion D1803-M
V2203-M
V2403-M
0.25 to 0.40 mm
0.0099 to 0.015 in.
Allowable limit
1.25 mm
0.0492 in.
Second ring
Factory
specifica-
tion D1803-M
V2203-M
V2403-M
0.30 to 0.45 mm
0.012 to 0.017 in.
Allowable limit
1.25 mm
0.0492 in.
Oil ring
Factory specification
0.25 to 0.45 mm
0.0099 to 0.017 in.
Allowable limit
1.25 mm
0.0492 in.
Second ring
Factory specification
0.093 to 0.128 mm
0.00367 to 0.00503 in.
Allowable limit
0.200 mm
0.00787 in.
Oil ring
Factory specification
0.020 to 0.060 mm
0.00079 to 0.0023 in.
Allowable limit
0.15 mm
0.00591 in.
KiSC issued 02, 2015 A