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An O-Ring is used to raise the clamping pressure around the combustion chamber. Volvo Penta's O-Ring (925073) is made to enhance cylinder sealing in applications requiring high cylinder pressure. The metal components wrap the bore and chamber, enhancing the healing properties of the head gasket. An O-ring is a gasket with a circular loop that connects two working surfaces. If this tiny and otherwise straightforward component is missing, the oil may flow into the valve guides, and inside the combustion chamber where it is burning.
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