Doosan DE08TIS Series User Manual

3. MAINTENANCE
58
3) Piston rings
(1) Visual check
Replace the piston rings with new ones if detected
worn or broken when the engine is overhauled.
(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.
MBE00
Standard
Limit
Top ring
0.3 ~ 0.45 mm
1.5 mm
2nd ring
1.0 ~ 1.2 mm
1.8 mm
Oil ring
0.3 ~ 0.5 mm
1.5 mm
·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
measured value is beyond the specified limit.
MBE00
Standard
Limit
Top ring
0.105 ~ 0.155 mm
0.2 mm
2nd ring
0.07 ~ 0.105 mm
0.15 mm
Oil ring
0.05 ~ 0.09 mm
0.15 mm
(4) Piston ring tension
With a tension tester, measure piston ring tension.
Replace the piston ring if the measured value is
beyond the limit.
MBE00
Top ring
2.2 ~ 3.3 mm
2nd ring
1.82 ~ 2.72 mm
Oil ring
5.49 ~ 7.41 mm

Doosan DE08TIS Series Specifications

General

Brand	Doosan
Model	DE08TIS Series
Category	Engine
Language	English