2004 Taurus duratec 3.0L s engine 24 v dohc
The Positive Crankcase Ventilation valve is part of moves made in the early 1980's (in Europe, earlier in the States) to limit crankcase emissions to atmosphere by arranging for them to be channeled into the engine intake so environmentally damaging oil mists and vapours are burned in the engine.
The pcv valve is a common method, but not the only method of achieving the aims. One end of the valve is usually connected to the engine, usually at the top on the safe side of the internal flame trap (cam cover, rocker cover) and the other side of the valve is usually connected to the intake manifold via a suitable hose.
The valve might be threaded and screwed in, a press fit into a plain hole or retained with a rubber grommet.
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