Feature：
The axial strain on the outer ring of the piston ring; Severely worn outer surface, Increased opening gap; Severe side wear, The ring groove is also worn accordingly.
Reason：
1. Three filter failure foreign matter enters the cylinder to form abrasive.
2. The assembly is not oiled or running out of oil, poor lubrication.
3. The engine is not burning normally, overload operation and failure of the cooling system, overheating the engine.
4.Cylinder deformation.
5. The too-small gap between ring and ring groove or excessive carbon deposits, ring stuck.
6. Into use without good running-in with the cylinder.
7. Long-term idling or low-speed operation.
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