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Post by rgmutchler on Sept 17, 2022 14:25:18 GMT -5
I cleaned my PVC valve within the last 50 miles. Recently I noticed that the fording valve in the line from the valve cover to the PVC valve had some oil leaking around the valve's stem. The valve remains open, as I don't do any water fording.
I pulled the tube that goes from the valve cover to the fording valve/pvc valve. I started the engine and held my finger over the engine side of the fording valve and it seems that the vacuum I felt never changed whether idling or at high RPM. If I understand your explanation of the system, vacuum is higher at idle and low RPM and vacuum is lower at higher RPM. So at idle and low RPS the pvc valve should close and restrict the vacuum from the engine and at high RPM is should open to some extent and increase the vacuum available to pull out the fumes from the engine.
Should I be able to detect that change in vacuum with the method I used above. It seems to me that if there is no vacuum restriction that under high vacuum it would pull some oil into the tube and through the pvc valve and that would be why I see oil in the tube from the engine to the pvc valve and the drops of oil on the fording valve stem. My engine idles, starts and accelerates without any problems.
Is my reasoning on this correct? I figure I need to replace the PVC valve but I wondered if the conclusions I was drawing on the amount of vacuum were correct.
Rick, by the way, thanks for the fuel vacuum pump rebuild, it seems to be working great. Ralph Mutchler
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Post by Scoutpilot on Sept 18, 2022 2:59:18 GMT -5
Without photos, it is difficult to determine the condition and setup. I assume the PCV valve was reassembled correctly. The only way to be certain is to use a diagnostic vacuum gauge.
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