Doosan DP222LBF - Piston Ring and Ring Groove; Piston Pin

12. Others/driving system
186
DV2213157A
Piston Ring and Ring Groove
1. In case of piston ring’s wear, damage or engine overhaul,
replace piston rings.
2. Piston ring gap clearance: measure the piston ring cut
part.
1) Insert the piston ring at the cylinder liner’s upper part
perpendiculary.
2) With a feeler gauge, measure the gap clearance of piston
ring.
DV2213158A_E
3) If the measured value exceeds the limit value, replace it.
DV2213159A_E
Piston pin
1. Wear
1) Measure the wear amount of the piston pin with a outside
micrometer.
2) If the reading exceeds the tolerance limit, replace the pin.
DV2213160A
2. Clearance
1) Measure the clearance between the piston pin and
connecting rod bush.
2) If the reading exceeds the tolerance limit, replace the one
which are worn more.
Item Standard
Piston outside diameter
Ø127.739 ~ Ø127.757mm
CAUTION
By comparing the measured value of the piston outside
diameter with the cylinder liner inside diameter, the
bigger clearance is replaced.
Gap gauge
Item Standard Limit
Top ring 0.35 ~ 0.50mm 1.5mm
2nd ring 0.40 ~ 0.60mm 1.5mm
Oil ring 0.40 ~ 0.70mm 1.5mm
Item Standard Limit
Outside diameter
Ø45.994~Ø46.000mm Ø45.983mm
Gap gauge