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  #1  
Old 01-20-2002, 08:50 PM
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Oil Separator????

I had some work done on my 190E 2.3 and I was told that I need a new Oil Separator. I have looked in my maintenance book and on the web, but I cannot find any info on what this part is. If anybody could inform me on what the oil separator is would be very helpful.

Thanks,
Gards

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  #2  
Old 01-21-2002, 08:14 AM
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The only MB's that had an oil separator (seperate) that I can remember were the diesels from the 1980's.
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Last edited by mbdoc; 01-21-2002 at 06:10 PM.
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Old 01-21-2002, 10:45 AM
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Thanks

Thanks for your reply. The only thing I remember the tech saying is that it helps keep oil out of the air filter housing. So anyway that is what he called it, but it maybe called something else. Again thanks for taking the time to read and reply to my question.

Gards
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Old 01-21-2002, 02:31 PM
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I have an oil separator on my 1982 240D. It's function is to take the crankcase vent (PCV) and separate the oil from the vent and send the oil to the crankcase and the cleaned vent gas to the air filter. It supposedly keeps oil out of the air filter and reduces oil consumption by reclaiming some of the oil in vent stream. If you have one on you gasoline engine, it should be similar in function. Look for about a 3/4 inch hose off of the valve cover going to the separator and similar hoses from the separator (bottom) to the crankcase and to the air filter.
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Old 01-21-2002, 03:59 PM
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Thanks for the info.

I spoke to the shop and the mechanic explained that it is in the Valve Cover and has to do with to breather hose back to the air filter housing.

Thank,

Gards
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  #6  
Old 05-11-2004, 05:55 PM
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Any parts # for oil separator for 190E 2.3?
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Old 05-11-2004, 07:25 PM
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The PCV system has a "liquid-vapor separator" inside the cam cover. It's a simple non-moveable device, but vibration can kill it. If you have oil in the air filter housing the separator may be broken, clogged, not functioning,... whatever.

You need to remove the cam cover and inspect it. I'm not sure if it available as a separate part. You may have to buy a new cam cover.

Duke
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Old 05-11-2004, 07:34 PM
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It's a separate part, fastened to the underside of the valve cover, venting out to the air filter housing via a branched rubber tube.
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Old 05-11-2004, 10:01 PM
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Something else to look for. Most of these era Merc engines do not have a PCV valve. They have a fixed metering orifice, which can evetually clog. During operation with manifold vacuum, ventilation flow is controlled by the orifice. The system draws clean air from the air cleaner housing - into the engine via the cam cover nipple and back out through the metering orifice to the inlet manifold. During WOT operation the flow can reverse and blowby is vented to the air cleaner housing.

If the separator is not functioning properly oil can be blown into the air clearner housing and then ingested. Also, if the orifice is blocked flow will be "backwards" all the time instead of just at WOT.

Duke
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Old 05-12-2004, 02:01 AM
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Quote:
Originally posted by Duke2.6
If the separator is not functioning properly oil can be blown into the air clearner housing and then ingested. Also, if the orifice is blocked flow will be "backwards" all the time instead of just at WOT.

Duke
Two more stupid questions! If the orifice is blocked, may I clean it by myself or I need to buy the new one.

Is the separator is under the valve cover? I need to take off the valve cover, then I can see the separator.

Thanks
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  #11  
Old 05-12-2004, 02:39 AM
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Depending upon what year yours is, it may or may not be available as a separate part. Early M102s had a metal oil separator screwed to the inside of the valve cover (rocker cover, cam cover, call it what you like) that is available as a separate part (but probably would never need replacing). Late M102s had a plastic oil separator (also held in with screws) that becomes brittle and cracks up with age (which is what I suspect yours has). This unit is not available separately as a spare part (makes a lot of sense... not!). With a broken oil separator in my '90 190E-2.3 (and a warped valve cover with flaking black finish) I was facing a cost of over AUD$700 for a new valve cover (including oil separator). I tried the earlier metal oil separator only to find that it does not fit my late valve cover! Any second hand valve covers were no better than mine.

In the end, I spent a whole Saturday afternoon fabricating a copy of the plastic oil separator from sheet metal (quite a fiddly job requiring cutting, shaping and brazing skills). While the valve cover was off I also bead-blasted all the flaking finish from it and re-finished it with high temperature engine enamel. When re-fitting the valve cover with a new gasket, a fillet of black gasket silicone sealant in the groove took up the variations caused by the warped cover. To this day my fabricated oil separator is working fine, my painted finish is holding on and the gasket has not leaked a drop of oil. Yes, a lot of work but a lot less cost than a new valve cover.
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  #12  
Old 05-26-2004, 05:41 PM
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hi! I took off the valve cover (cam cover) and it has a metal oil separator on my 87 MB 190E 2.3L 8V. I took out the oil separator and cleared it. It seems nothing inside the oil separator. Now, the stupid question is if nothing inside the oil separator, how does it function?
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  #13  
Old 05-26-2004, 09:56 PM
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I'm not familiar with the separator on your car, but their only function is to remove any oil droplets. They usually consist of a labyrinth that traps tiny drops, but lets gaseous material pass.

It's also possible that it's "empty" because something inside has come apart and disappeared into the engine.

See if you can order a new one and compare to the old.

Duke

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