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It is a filtered opening in one of the valve covers and allows the PCV to draw filtered air through the crankcase.

Engine Breather Systems

Inside an engine internal pressure is produced within the crankcase. This pressure is generally caused by a small leakage of combustion gasses past the piston rings, this is known as blow-by. If this pressure is not released, the subsequent build up can cause gaskets and seals to fail, creating engine oil leaks.

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โˆ™ 2012-03-27 13:17:46
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Q: What is an engine breather and what is its purpose?
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