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Piston scraping
Time:2012/4/20  Hits:2424  


During the relative motion between piston, piston ring and piston pins in the cylinder, a scuffing between piston and cylinder sleeve is arising from dry rub or strain for some reason, when it is run to a certain extent, a slight piston click will be accompanied with the engine while a metal depositing is arising in the surface of cylinder; when the circumstances are particularly serious, the groove or stoppage turns up on piston and the surface of cylinder sleeve. The scraping is a common failure to be tightly prevented, the reasons involves:

1. Unreasonable interval of cylinder sleeve: when the joint interval is overlarge, the piston is run out during the operation, it bumps the cylinder sleeve under reciprocating motion and destroys the lubricant film to result in dry rub and scraping; when the joint interval is too small, there is no lubricant film arisen and result in dry rub and scraping of piston skirt.
2. Abnormal operation of engine cooling system gives rise to over high temperature of engine and too thin or void lubricant escaping from forming lubricant film, then the dry rub results in the scraping of piston skirt.
3. Improper or bad lubricant fails to form lubricant film or produces easilybroken film to cause dry rub and result in scraping of piston skirt.
4. Improper mounting, like reverse mounting of eccentric piston and unclean mounting,results in the scraping of piston skirt.
5. Bad or void maintenance of engine filters (air, fuel and oil filters) makes available for the entrance of strange matters to the cylinder and result in piston scraping.
6. Overload or improper adjustment of engine result in dieseling of engine and overhigh temperature in the cylinder and piston-head scraping.
7. A failure in engine combustion system, involving bad fuel atomization or improper air-fuel ratio, causes insufficient combustion of engine and produces excess coke to be felled off into the interval between piston and cylinder sleeve. Under serious circu-mstance, it may seize the piston ring and result in piston-head scraping.

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