123d Crankcase Oil Breather?

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ftb101
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123d Crankcase Oil Breather?

Post by ftb101 » Sun Aug 12, 2012 8:14 pm

Just been reading the latest issue of TBMW which has a very interesting article about DIY servicing. In the article it recommends, for diesel engines, that the crankcase oil breather is refreshed every second oil change. However, using Realoem.com I can't seem to find the breather on the 123d. Anyone know if it has one?
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Re: 123d Crankcase Oil Breather?

Post by Bob123d » Sun Aug 12, 2012 9:31 pm

I don't see one mentioned for the 123d, here is where i would expect to see it on realoem. In the older diesels BMW had alot of problems with them clogging up and causing seals to burst, maybe with the newer diesels they have found a way to vent the crankcase differently?

http://www.realoem.com/bmw/showparts.do ... g=11&fg=15
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Re: 123d Crankcase Oil Breather?

Post by ftb101 » Mon Aug 13, 2012 6:38 pm

Thanks Bob, that's where I'd expect to see it too but its definately not there.

Anyone else have any input of this, MP or 123d_msport_mark maybe?
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Re: 123d Crankcase Oil Breather?

Post by marco_polo » Mon Aug 13, 2012 7:17 pm

Logically I would have thought there must be provision for expanding gasses within the crankcase? Wouldn't you turn any one of a whole bunch of seals/gaskets inside out without a PCV vent??

I don't know where it it on an N47 though.
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Re: 123d Crankcase Oil Breather?

Post by Bob123d » Mon Aug 13, 2012 10:22 pm

Vented to the airbox? Have a look at this, there is a washable filter for sale on amazon for the 123d.

http://www.amazon.co.uk/MAGNUM-WASHABLE ... B007YZI93O
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Re: 123d Crankcase Oil Breather?

Post by ftb101 » Mon Aug 20, 2012 9:06 pm

For all those interested, at the weekend I traced what I believe is the crankcase breather. Thanks to Bob, I knew I was looking for a pipe as the aftermarket filter he linked to fits into a pipe. It appears that BMW have been very clever as the breather takes its air from the airbox after it has been filtered. It is situated after the MAF. It's good news as I don't have to worry about changing a seperate filter for the crankcase breather at service. :)
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Re: 123d Crankcase Oil Breather?

Post by Bob123d » Mon Aug 20, 2012 10:23 pm

ftb101 wrote:For all those interested, at the weekend I traced what I believe is the crankcase breather. Thanks to Bob, I knew I was looking for a pipe as the aftermarket filter he linked to fits into a pipe. It appears that BMW have been very clever as the breather takes its air from the airbox after it has been filtered. It is situated after the MAF. It's good news as I don't have to worry about changing a seperate filter for the crankcase breather at service. :)
Nice one, I had never seen it done that way before. Quite clever really.
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Re: 123d Crankcase Oil Breather?

Post by Ry_B » Tue Nov 03, 2015 10:58 pm

BMW learnt from their mistakes of the past!

I had an E39 530d previously which didn't have this replaced and I didn't know about the problems until after the turbo blew!
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Re: 123d Crankcase Oil Breather?

Post by weasley » Wed Nov 04, 2015 8:03 am

ftb101 wrote:For all those interested, at the weekend I traced what I believe is the crankcase breather. Thanks to Bob, I knew I was looking for a pipe as the aftermarket filter he linked to fits into a pipe. It appears that BMW have been very clever as the breather takes its air from the airbox after it has been filtered. It is situated after the MAF. It's good news as I don't have to worry about changing a seperate filter for the crankcase breather at service. :)
Not sure I get you?

The breather flows gas from the crankcase to the airbox, not the other way. The reason you might want a filter in it is to catch anything that comes out of the crankcase and goes into the airbox on the downstream side of the air filter (so would go straight into the engine).

The crankcase breather is there to vent blowby gases, which will contain all sorts of stuff, including soot and particulate matter from combustion as well as collecting anything volatile from the engine oil. In the olden days they vented to atmosphere but this is considered to be a form of emissions, so they have to recirculate them back into the engine to be burnt.
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Re: 123d Crankcase Oil Breather?

Post by iscinteianu » Mon Feb 11, 2019 10:22 am

Hi guys!

I have a 118d N47, and i think my crankcase vortex breather is clogged, as i'm seeing alot of oil into the intake pipe. Do you know how can i fix this problem? I've cleaned the intake manifold last spring and now it's full of nasty oil dust mix again...

Was thinking of installing an oil catch can somehow, that does the same thing but first thought to ask you first.

Cheers!

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Re: 123d Crankcase Oil Breather?

Post by marco_polo » Mon Feb 11, 2019 10:57 am

If you're seeing a lot of oil in your intake, the breather can't be blocked! That's where it breathes into.

My 120d charge pipes were always full of oil, even with a brand new breather fitted.
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Re: 123d Crankcase Oil Breather?

Post by iscinteianu » Mon Feb 11, 2019 11:41 am

I mean not blocked in the way it cannot get through, but blocked as not doing its thing. It should prevent oil from vapors to get into the intake by filtering it, that's what i think.
That oil goes from that small flex pipe down the turbo -> then intercooler -> up through the pipes until the manifold. So it should be a mess if i get that much into it in under a year...

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Re: 123d Crankcase Oil Breather?

Post by Tom_B » Mon Feb 11, 2019 9:12 pm

As Marco quite rightly says, some oil will always make it through the breather system - and to be honest the cyclonic separators aren't particularly effective, especially if your engine is tired & breathing heavily. Funnily enough, the old "bog roll" type fitted in the M47 was almost-certainly more effective in terms of removing oil droplets, but sadly was rather prone to clogging.
One thing worth checking is that your sump isn't over-filled above the max mark, as this will increase the amount of oil chucked into the vent system and make life more difficult for the separator.

Just to check - you say the intake manifold is grubby; I assume you're not referring to EGR deposits?

Tom

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