Positive Crankcase Ventilation ( PCV ) Valve HMMWV

nash19 said:

Hi All,

I recently bought a 2002 M1123 that had the deep water fording kit on it. When they did the de-mil they removed the PCV so there is a hose coming off of the oil fill neck that goes to nothing now. It seems to run fine without the PCV but if I replace it will I see an increase in performance and does it hurt the engine in any way to run it without the PCV?

Any advice is appreciated!

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Thunderbirds said:

Welcome to the forum.

Yes, you are running a great chance of sucking foreign material into the crankcase. Slim, but catastrophic if/when it happens... The replacement is relative cheap for around $60, or $70 for the DWF style with extra port (to nowhere unless you reinstate the entire system).

Best of luck, keep us updated on any progress.

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