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#16
06-02-2016, 09:01 AM
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Oil blowing out the dipstick - '95 E300D
About a year and a half ago my brother and I changed the Glow plugs on the 95 E300 and we refreshed all of these (They would not fit right any longer). From what I remember they were not that expensive - #30 there in the diagram is the most expensive one there.
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CM Last edited by carl177; 06-05-2016 at 07:52 AM. 
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#17
06-02-2016, 12:59 PM
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#30 is the differential pressure valve. it's the most likely cause for this problem. What's inside is a rubber diaphragm that controls the passage from the breather tubes to the intake manifold. If the rubber has petrified, it won't open, which allows blowby pressure to build until something gives...the rear main, the dipstick, whatever the weakest seal happens to be.
Do not let this vent to the atmosphere. Aside from the legal and social implication of releasing contaminates, it's like venting your exhaust into the engine compartment. Eventually, it finds it's way back into the passenger areas. A third to half of all engine pollutants are eliminated via the crankcase breather.
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#19
06-13-2016, 01:27 PM
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Well, that was apparently the problem. As proof of principle I got a length of heater hose and vented the valve cover overboard. Worked like a charm. Cleaned the engine, there was oil everywhere, and it looks as if the rear main seal has also stopped leaking! I will run it a few days more then order the differential pressure valve and tubing/hosing/fittings to get it back to stock. I may even put the belly boards back on. I sincerely appreciate all the help. I could not have found the problem without you guys.
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#20
06-13-2016, 01:35 PM
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On my 97 I plugged the 12 holes in the manifold, added a catch can and vented to the intake pre filter. It worked great but in hindsight I wish I had gotten rid of the UFO valve thing. I'm also getting oil coming out the dip stick. Not a lot but just enough to be annoying.
http://www.peachparts.com/shopforum/3371766-post26.html
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CENSORED due to not family friendly words 
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