Kubota WSM B2050 Workshop Manual page 143

B2050, B2350, B2650, B3150, WSM
Clearance between Piston ring and Piston Ring 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.
Second ring
Clearance between
piston ring and piston
ring groove
[D1105, V1505]
Oil ring
Second ring
Clearance between
piston ring and piston
ring groove
[D1305]
Oil ring
Factory specification : a
[D1105, V1505]
(A) Top Ring (Key Stone Type)
Connecting Rod Alignment
1. Remove the crankpin bearing, and install the connecting rod
cap.
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.
Space between gauge
Allowable limit
pin face plate
1-S54
Factory speci- 0.0950 to 0.122 mm
fication 0.00374 to 0.00480 in.
0.2 mm
Allowable limit
0.008 in.
Factory speci- 0.020 to 0.060 mm
fication 0.00079 to 0.0023 in.
0.15 mm
Allowable limit
0.0059 in.
Factory speci- 0.0850 to 0.122 mm
fication 0.00335 to 0.00480 in.
0.2 mm
Allowable limit
0.008 in.
Factory speci- 0.02 to 0.06 mm
fication 0.0008 to 0.002 in.
0.15 mm
Allowable limit
0.0059 in.
More than
0.2 mm
0.008 in.
(B) 2nd, Oil Ring
9Y1210982ENS0100US0
0.05 mm
0.002 in.
9Y1210982ENS0101US0
KiSC issued 03, 2014 A
ENGINE