Info needed: M38A1 fording valves

[Lynn Eades]

Ken, I've never met one of these Jeeps, but as no one has directly answered your question and following on from what Rob has said, Then I'd say: Yes, The excessive crank case pressure could very well increase oil consumption.
Changing a negative pressure in the crankcase to a positive pressure would likely be enough.

[Les Kovacs]

Rob....as per your suggestion of checking the PCV valve...would you have a picture or diagram as to what direction the check valve is supposed to be facing in the PCV valve? Also, can I check this by blowing into the end directly coming out of the valve cover.....if air does not pass through I assume that...1. the fording valve lever is closed or 2- the PCV check valve is stuck/backwards? I am assuming that what I am looking for is blown air to pass all the way through the valve piping & PCV valve and into the fuel pump?

Regards to all that responded to this post.

lesk

[rob love]

You should have a clear path for the vapours to leave the engine side pan. The PCV valve will prevent a backfire from feeding back into the engine and blowing the oil pan off.

If you don't have a clear path, then as you mentioned either the fording valve is closed, the PCV valve is backwards, or the PCV valve is gummed closed. The PCV valve should be cleaned once in a while, otherwise any buildup could result in it not closing fully and allowing a backfire to feed into the bottom half of the engine.

[Les Kovacs]

Thanks Rob....Happy New Year!

lesk