Doosan DP158LDF - Piston Ring and Ring Groove; Piston Pin

12. Others/driving system
200
DV2213157A
Piston Ring and Ring Groove
1. In case of piston ring’s wear, damage or engine over-
haul, 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
out
side micrometer.
2) If the reading exceeds the tolerance limit, replace t
he
pi
n.
DV2213160A
2. Clearance
1) Measure the clearance between the piston pin and
connecting rod bush.
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 diam-
eter, the bigger clearance is replaced.
Gap gauge
Item Standard Limit
Top ring 0.35 ~ 0.55mm 1.5mm
2nd ring 0.50 ~ 0.82mm 1.5mm
Oil ring 0.30 ~ 0.62mm 1.5mm
Item Standard Limit
Outside diameter
Ø45.994~Ø46.000mm Ø45.983mm
Gap gauge