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Deglazing (engine mechanics)
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Deglazing is a process by which the surface of an engine cylinder is roughened to create friction between the moving parts and allow engine oil to grip the sides of the cylinder.
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Use
In a gasoline or diesel engine, the pistons ride up and down within the engine maintaining a tight seal via the piston rings. Over time, the constant rubbing of the rings against the cylinder wall can wear the wall to a smooth finish. This makes it more difficult for lubricating oil in the engine to adhere properly, which in turn increases friction. Additionally, while breaking in newly installed piston rings, a minute amount of wear must occur between rings and cylinder wall in order to seat the rings properly, and ensure a gas-tight seal. If the cylinder walls are too smooth, this wear will not occur, with the rings "skating" over the polished surface.[1]
Deglazing involves use of an abrasive to create approximately 45 degree angle crosshatching of tiny grooves in the cylinder wall.[1] Crosshatching that deviates too far[clarification needed] from 45 degrees can cause either unwanted accumulation of oil or inadequate oil adhesion.[2]
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References
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