Kubota B1830, Workshop Manual

Page: 161 / 548

ENGINE B1830,B2230,B2530,B3030, WSM
1-S60
Piston Ring Gap
1. Insert the piston ring into the lower part of the cylinder (the least
worn out part) with a piston.
2. Measure the ring gap with a thickness gauge.
3. If the measurement exceeds the allowable limit, replace the
piston ring.
9Y1210003ENS0099US0
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
thickness 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.
9Y1210003ENS0100US0
Piston ring gap
[D905-E2]
Top ring
Factory
specifica-
tion
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit 1.25 mm
0.0492 in.
Second
ring
Factory
specifica-
tion
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit 1.25 mm
0.0492 in.
Oil ring
Factory
specifica-
tion
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit 1.25 mm
0.0492 in.
Piston ring gap
[D1005-E2]
[D1105-E2]
[V1505-E2]
Top ring
Factory
specifica-
tion
0.30 to 0.45 mm
0.0118 to 0.0177 in.
Allowable
limit 1.25 mm
0.0492 in.
Second
ring
Factory
specifica-
tion
0.30 to 0.45 mm
0.0118 to 0.0177 in.
Allowable
limit 1.25 mm
0.0492 in.
Oil ring
Factory
specifica-
tion
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit 1.25 mm
0.0492 in.
Clearance between
piston ring and piston
ring groove
Second
ring
Factory
specifica-
tion
0.085 to 0.112 mm
0.0033 to 0.0044 in.
Allowable
limit 0.20 mm
0.0079 in.
Oil ring
Factory
specifica-
tion
0.020 to 0.055 mm
0.0008 to 0.0021 in.
Allowable
limit 0.15 mm
0.0059 in.
KiSC issued 05, 2012 A