Dirty oil in the plastic elbow - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 06-17-2019, 01:47 PM Thread Starter
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Dirty oil in the plastic elbow

After cleaning the MAF sensor on my M272 I was going to spray out the throttle body as well. And found a lot of oil and dirt in the plastic diverter that fits between the MAF and TB. When I say dirt I mean the kind you can roll between your fingers and it and the oil appears to be coming from the hose that connects that part to the engine.
I would think that maybe the car has been ran with that hose unattached for awhile if it would run in that configuration, however the hose was well attached when I started the project.
Any thoughts on how it could get that way and how to fix the problem would be appreciated.
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post #2 of 6 (permalink) Old 06-17-2019, 08:13 PM
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This could be related to the centrifugal oil separator which is located on the back end of the right cylinder head.
This is part of your positive crankcase ventilation system.
Check that all hoses are well connected ,,,or if you want to you could remove the separator and check it out /clean it etc ,,but I have no exact knowledge on how they work.
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post #3 of 6 (permalink) Old 06-17-2019, 08:39 PM
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The purpose of the centrifuge (a modern version of the PCV valve) is to let air vent from the crankcase without bringing oil with it. Even when everything is working properly, there will still be some oil suspended in the air that makes its way into that hose, the elbow, the throttle body and manifold. A good cleaning of all of this never hurts.
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post #4 of 6 (permalink) Old 06-18-2019, 05:15 AM Thread Starter
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Thank you, very informative. My main concern now is the grit in the oil, which would have to be from wearing engine components, because I saw no evidence that the air-filter was allowing dirt through. The MAFS and path before the diverter was clean. Is it possible that the oil separator is disintegrating?
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post #5 of 6 (permalink) Old 06-18-2019, 07:58 PM
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I doubt it. The grit is probably just the result of very tiny dirt molecules that collect in the "sludge" oil in the tube. It's normal.
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post #6 of 6 (permalink) Old 06-19-2019, 08:21 AM Thread Starter
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Good to hear. it's cleaned up now. Hopefully the oil held onto all the contaminates and we'll be good for another ten years. By then everything will be powered by batteries anyway.
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