Crankcase breather filter

[losichu]

Does anyone know what this is? I understand that it has an obvious name, but is this a necessary thing to change? Where do they go?

[mooseheadm5]

There is no breather filter, but there is a crankcase breather valve at the back of the intake near the firewall that can go bad and cause a vacuum leak or a squealing noise.
http://realoem.com/bmw/showparts.do?model=CG73&mospid=47506&btnr=11_1569&hg=11&fg=40

It bolts to the top of part 12.
-Paul

[losichu]

I saw that advance auto sells a breather filter for the ti, just wondering what this was. Is the valve a maintainance item, or is it a replace when broken type of part?

[mooseheadm5]

NO SUCH THING. No BMW built that I have worked on or can think of has a crankcase breather filter, from 60s 2002s to 06 760Li.
-Paul

[318iS]

I saw that advance auto sells a breather filter for the ti, just wondering what this was. Is the valve a maintainance item, or is it a replace when broken type of part?

can you post a picture so we can see it ? ? ?

[losichu]

they didn't have a picture, they just had the part.

http://www.partsamerica.com/ProductList.aspx?parttype=3&ptset=A&searchfor=Crankcase+Breather

Does anyone know how to tell if that crankcase vent valve has gone bad (#16)?

http://www.realoem.com/bmw/showparts.do?model=CG73&mospid=47506&btnr=11_1562&hg=11&fg=15

Or the shut off valve (#15)?

http://www.realoem.com/bmw/showparts.do?model=CG73&mospid=47506&btnr=11_1658&hg=11&fg=45

[DeadpaN]

You tell if they're bad with just a visual inspection. My crankcase vent valve pretty much crumbled into pieces (the inside) when I removed it and looked at it. Stop valve is bad if it looks at all rusty inside-where the valve is..