Piston Rings; Piston Ring Gap; Piston Ring Side Clearance; Piston Ring Tension - Daewoo DE12T Manual

3.2.9. Piston rings

1) Visual check
Replace the piston rings with new ones if detected worn or broken when the engine is over-
hauled.

2) Piston ring gap

•
Insert the piston ring into the upper
portion of the cylinder liner bore so
that it is held at a right angle to the
cylinder liner wall.
•
Measure the piston ring gap with a
feeler gauge.
Top ring
2nd ring
DE12T/TI/TIA 0.30 ~ 0.50 mm
Oil ring
DE12TIS
•
Replace piston rings with new ones if the gap is beyond the limit

3) Piston ring side clearance

•
Fit the compression ring and oil ring
in the piston ring groove.
•
With a feeler gauge, measure side
clearance of each ring, and replace
either the ring or piston if the mea-
sured value is beyond the specified
limit.
Top ring
2nd ring
2nd ring

4) Piston ring tension

•
With a tension tester, measure piston ring tension.
•
Replace the piston ring if the measured value is beyond the limit.
Top ring
2nd ring
Oil ring
Standard Limit
0.30 ~ 0.45 mm 1.5 mm
0.35 ~ 0.50 mm 1.5 mm
1.5 mm
0.40 ~ 0.70 mm
Standard Limit
-
0.07 ~ 0.102 mm 0.15 mm
0.05 ~ 0.085 mm 0.15 mm
Standard
2.27 ~ 3.41 kg
2.0 ~ 3.0 kg
4.03 ~ 5.57 kg
INSPECTION AND MEASUREMENT
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간극 게이지 feeler
gauge
EA0M4032