1993.5 S4 green crankcase breather

[stevefh]

Hi all, can you clean this breather by just running petrol through it without doing any damage.?

Does it dismantle and go back together with little difficulty ?

[CarBuff]

Late reply,

 

The inside our breather (red) of our 1988 is nothing more than a screen with a rubber flap inside. By design, it allows airflow (pressure) one way, but not the other.

 

I've taken them apart and found the flaps were malformed by oil fumes and would not close.

 

Because there is rubber inside, I would carefully and completely rinse out the inside with water after cleaning with anything that might further deteriorate the rubber flaps.

 

[stevefh]

Hi Atwell,thanks for reply. Used an inspection camera to look inside, cannot see much but have attempted to upload what I could. Little evidence of a rubber flap and I can blow through in both directions and there doesn’t seem to be any difference.

My part number is A912E6802F crank case breather valve,I couldn’t find it on SJ sight. It has Milofiltre written on it. My S4 is 1993.5 you say yours is 88, are they the same?If so how did you get it apart and back together again and/ or another source. Thanks again in 

[stevefh]

Hi Atwell, looked up in my 88USA parts section (have you got it?) your part number is A910E6728F(Red) but please tell me how you got yours apart and back together.Thanks

[jonwat]

The parts manual lists it as A912E6802F & no longer available.

Does no one reproduce it or supply an alternative? 

[CarBuff]

7 hours ago, stevefh said:

please tell me how you got yours apart and back together.

It was Soooo long ago....🙄

 

I might have just looked through the outlet opening after removing it from the car. Sorry.

 

Your second picture shows the shape of the flaps on ours. I don't know the difference in specification.

 

We DO get a bit of oil in our air filter housing from crankcase pressure. Because of that, we clean our Bosch fuel metering flap at least yearly.

The purpose of the red (or green) part is to limit the flow to one direction (OUT of the crankcase) It's a Positive Crankcase Vent valve, after all.

 

Quote

The PCV system draws leftover combustion gases from the crankcase (the oil pan and bottom of the engine) and routes them back into the engine via the intake manifold or air filter housing, where they're burned in the combustion chambers instead of escaping into the atmosphere via your exhaust system.

 

[Clarky5150]

It is rebuildable. It contains a number of mesh screens inside (make sure you pop em back in the same way once you've brake and clutch cleaned em. It's a very crude but seemingly quite efficient design and never fails causing billows of smoke like the far more modern and complicated Porsche AOS devices.

[Scuderia Condor]

Hello everybody ,

The crankcase breather comes from Peugeot Citroen. You can get it for 16 € + shipping.

Here is the link : https://www.cipere.fr/fr/Alle/Alle/Motorblock/ANR41421/

Regards

Momo

[NG5]

Scuderia, that's very good to know as cipere seem to be the same group as der franzose who over the years I've used a lot for Renault bits for my Europa without any issues and they usually ship next day.

At that price will probably get one as a spare next time I order from them.

Here is the same link on the english language site for der franzose

https://www.franzose.de/en/Alle/Alle/Motorblock/ANR41421/