Doosan DE12T - Piston Pin; Piston Ring Tension

4) Piston ring tension
With a tension tester, measure piston ring
tension. Replace the piston ring if the
measured value is beyond the limit.
9.2.10. Piston pin
1) Wear
Measure the amount of wear on the pis-
ton pin at the points as shown. The mea-
sured values are beyond the limit (0.005
mm or greater), replace the pin
2) Clearance
Measure the clearance between the pis-
ton pin and connecting rod bushing, and
replace either of them, whichever dam-
aged more, if the measured value is
beyond the limit.
3) Condition check
Check the engaged condition of the pis-
ton and piston pin. If it is possible to force
the pin into the piston heated with piston
heater, the piston is normal. When replac-
ing the piston, be sure to replace the pis-
ton pin together.
- 89 -
EA0M4031
EA3M2047
Standard
Top ring 2.27 ~ 3.41 kg
2nd ring 2.0 ~ 3.0 kg
Oil ring 4.03 ~ 5.57 kg
Standard Limit
44.995 ~ 45 mm 44.990 mm or less
Standard Limit
0.003 ~ 0.009 mm 0.011 mm