DAELIM ET-250 Service Manual page 63

Check cylinder if warp.
Service limit: 0.05 mm
Measure clearance between piston rings and grooves.
Service Limit: Top ring: 0.09 mm
nd
2 ring: 0.09 mm
Remove piston rings
Check if the piston rings are damaged or its grooves
are worn.
Caution
Pay attention to remove piston rings because
they are fragile.
Place piston rings respective into cylinder below 20
mm of cylinder top. In order to keep the piston rings
in horizontal level in cylinder, push the rings with
piston.
Service Limit: Top ring: 0.50 mm
nd
2 ring: 0.65 mm