A piston ring is a ring used in conjunction with a piston to seal an engine's combustion chamber and regulate oil use. Piston rings often experience wear due to a number of different factors. As such, it is important to know how to analyze piston ring failures.
Scuffing
- Scuffing of the piston ring leads to wear on the ring face. Damage to the ring face can lead to a loss of ring control. When this occurs, it usually results in high base pressure, oil over-consumption and piston scoring. This can cause the piston to seize altogether.
Causes
- Three things are the primary cause of a piston ring becoming scuffed; they result from normal engine operation. These are fuel wash-down (which occurs when abrasive fuel comes into contact with the piston ring), debris ingestion (which occurs when materials from outside get stuck in the engine) and severe overloading (which occurs when the engine is overworked).
Improper Assembly
- Piston rings are sometime assembled improperly. If the piston ring is misaligned due to improper assembly, oil may bypass the rings. This can cause carbon buildup, which can lead to a piston ring becoming scuffed.
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