The Great PCV Debate Revisited


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Posted by dave horvath [173.245.54.28] on Sunday, August 21, 2016 at 08:25:59 :

Several folks on this forum, myself included, have argued that the closed positive crankcase ventilation (PCV) system was introduced with the 1946 WDX Dodge Power Wagon since it was designed for civilian use as a stationary power plant for operation of a variety of PTO-powered machinery. Our reasoning was that the earlier open style downdraft PCV tube can only properly ventilate the crankcase gasses if the vehicle is in motion creating the needed draft.

Others have argued that the closed PCV system was introduced to create a more watertight system for fording since the water would need to rise to the level of the carburetor to flood the engine.

This drawing from the Master Parts list indicates that the closed PCV system was introduced in later model T-214 vehicles, which include the WC 3/4 tons, and it was also installed on all T-223 WC 1.5 ton 6x6 models.

This information seems to lend validity to the "watertight" theory. Also there are several photos and videos showing the WC 6x6s in deep water fording conditions. One video shows how you should loosen the fan belt before fording to avoid throwing water on the distributor.






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