Oil ring
An oil ring is one component that fits into the ring groove on a
piston. Works to scrape off excess lubricant adhering to the
cylinder wall so that the oil does not enter the combustion
chamber.
Generally, the outer circumference of the ring is grooved, and
the groove has evenly spaced oil return holes.
The oil ring groove is also perforated, so some of the scraped
oil is returned to the crankcase through the oil holes in the
ring and piston.
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