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  #1  
Old 01-10-2019, 10:27 AM
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CCV hoses clogged with Mayo

Careening toward head gasket swap and one of my symptoms other than pressure buildup in the overflow tank is mayo under the oil filler cap and under the valve cover (only around the cap area) I have the intake loose and all of the CCV hoses off except for the oil separator and all of the hoses are full of mayo.

This 03 only has 94k on the odometer and was owned by a preacher in Atlanta so I would suppose only driven to the church on Sundays..... short local trips.

I will be replacing the separator and all the hoses but my question is what would cause the mayo buildup and since I am not opposed to forgoing a head gasket job if there is another solution, is there any chance a clogged CCV/Separator would cause excess pressure in the cooling system?

(too cool and windy to work on it today)

Thanks.
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  #2  
Old 01-10-2019, 10:32 AM
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Well the short trips if that is how it was driven could account for the mayo.

The pressure in the tank isn't related though I would imagine. So head gasket is still a possibility. Get a radiator test kit and check for gassing into the coolant or take it by a radiator shop. Most have the tester and will test it for you.
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Old 01-10-2019, 10:33 AM
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It wouldn't affect the cooling system pressure, unfortunately.



The mayo is caused by the CCV, but is made worse with short trips in cold weather as well as long oil change intervals. Replace it and all the hoses associated with it. Also check the dipstick tube. Theres plenty of writeups.
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Old 01-10-2019, 11:10 AM
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Thanks. Radiator hold 14 psi but pressure increases under load and breaks coolant tank (my previous posts).

Block tests (blue fluid does not turn yellow) negative.

I was just surprised how clogged the CCV hoses are, hoping it might be the prob.
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Old 01-10-2019, 11:53 AM
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You'll have to do the CCV job either way, so it can't hurt.
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Old 01-10-2019, 12:40 PM
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I solved the mayo in the engine problem by switching over to the Soccer mom minivan in the winter. The minivan has a standard PCV valve instead of that fangle dangle CCV setup by BMW.
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Old 01-10-2019, 07:22 PM
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If theres mayo in the CCV hoses, I'd also yank the air manifold on top of the intake and clean it (intake/carb cleaner) and the double walled dipstick tube elbow (wire).
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Old 01-10-2019, 10:56 PM
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The Ďmayoí is water in the oil which then gets whipped into a foam.

The water has two possible sources: leaks from the coolant system into the cylinders or crankcase, and condensation from blowby (passing the rings) exhaust gasses that get purged out of the crank case by hot engine temperature and the CCV system.

Short trips donít get the condensation boiled out of the oil and it can build up and form mayo. Itís a small amount of water.

Leakage from a failing gasket is usually a much larger amount of water. Exhaust gasses usually end up back into the cooling system if itís a leaking head gasket. You can get a test kit that will test for gasses in the cooolant.
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Old 01-10-2019, 11:08 PM
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Quote:
Originally Posted by Scott ZHP View Post
If theres mayo in the CCV hoses, I'd also yank the air manifold on top of the intake and clean it (intake/carb cleaner) and the double walled dipstick tube elbow (wire).

That'd where the majority of sludge was in my car, when I did mine a couple years back. Almost none anywhere else. None at all in the dipstick tube. Not sure why myself.
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Old 01-11-2019, 01:05 PM
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If there is coolant in the oil(even a small amount) you'll need to do more than head gaskets.Coolant doesn't play well with the crank and cam bearings.So you do the head gaskets and then a few months down the road you end up with an engine knock or low oil press.What I've done before if there is any question about coolant or water in the oil is to let the vehicle sit for a day or so.The oil and coolant will separate after a time.SO THEN YOU CRACK THE OIL DRAIN PLUG AND SLOWLY LOOSEN IT.If there is coolant or water it will come out first before any oil and you can tell how much is actually in there.
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