Kubota EA330-E4 Series Workshop Manual page 117

EA330-E4, WSM
Piston Ring Gap
1. Insert the piston ring into the lower part of the liner (Measuring
points are shown in the figure) with a piston ring compressor
and the piston.
2. Measure the ring gap with a feeler gauge.
3. If the gap exceeds the allowable limit, replace the piston ring.
Factory
specifica-
tion
Ring gap
Allowable limit
(a) Approx. 90 mm (3.5 in.)
Clearance between Piston Ring and Ring Groove
1. Clean the rings and the ring grooves, and install each ring into
its groove.
2. Measure the clearance between the ring and the groove with a
feeler 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
specifica-
tion
Clearance between
piston ring and ring
groove
Allowable
limit
NOTE
• As the top ring is a Keystone type, it cannot be measured
by this method.
1-S52
ENGINE
Top ring
0.30 to 0.45 mm
Second
0.012 to 0.017 in.
ring
0.25 to 0.40 mm
Oil ring
0.0099 to 0.015 in.
1.2 mm
0.047 in.
9Y1211018ENS0089US0
Top ring Keystone ring
Second 0.0850 to 0.112 mm
ring 0.00335 to 0.00440 in.
0.020 to 0.055 mm
Oil ring
0.00079 to 0.0021 in.
Second 0.2 mm
ring 0.008 in.
0.15 mm
Oil ring
0.0059 in.
9Y1211018ENS0090US0
KiSC issued 05, 2015 A