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      06-01-2012, 01:56 PM   #1
mistryn
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How to replace oil breather on E92 335D

I presume this may be same if not similar process for other models.

A month ago I noticed some oil underneath the sump which I thought was the sump gasket leaking.
http://www.e90post.com/forums/showth...light=oil+leak

I took some pictures and went into BMW to give me a rough idea. They would not say for certain until they took a look (fair enough) but cough fee cough to plug into diagnostic was required before they did anything. I politely said no thanks,instead if it were to be the sump to give me a price to replace- 430 to replace gasket and refill with oil

I then got in touch with a BMW specialist whom I took my car down to him and he had a look. He cleaned the under of the sump off best he could and told me to monitor it. He asked when was the last time the oil breather pipe was replaced?
I was not sure if the previous owner had it replaced as there was no record. I did take it off to inspect it January 2012 and found it to be a later Ventualli (SP) design which does not replacing according to BMW Great I thought as the old type was prone to clogging up due to the loo roll type filter, making the engine difficult to breathe, oil getting into inlet manifold/turbo etc =

He shook his head and said that is true but if it was him personally for the sake of 45 he would replace it as they have a diaphragm inside which over time wears out and may restrict the air flow.

Please excuse some of the pictures as I replaced the breather and then refitting I took some pictures as I thought I would write up a how to

First of all you need a oil breather (part number may be the same for yours but please check)


Lift and pull 4 tabs up


Top cover will come off


The lower part will need to come out and is held in with 3 clip tabs, I gave it a sharp tug towards me. You may have to use a flat heat headed screwdriver to push tab down and pull


Now remove the pollen filter housing, it is held on with 6 bolts. If you want to replace the pollen filter remove this assemble and the filter is on the back, unclip and clip in new one



Remove the 2 covers each side of the car, one above the brake fluid reservoir and the other above the electrical gubbins. These are unclipped by 2 tabs and 1 rubber tab which you slide out (be careful with the plastic tabs as they can break)



Twist the sensor clockwise and release the 2 clips and move it out of the way




On the other side undo the plug for the bonnet pin and move out the way


Pull the washer fluid pipe up from the clip and move out the way


There are 2 bolts you need to remove either side



Now pull the whole scuttle panel toward you (facing engine bay) and it should come out (when refitting make sure it seals alongside the edge)

My cam battery ran out at this point, the engine cover needs to be removed and its held on with5 bolts and lift the cover up and out towards you (tip ensure the oil filler cap is removed otherwise the cover wont come out. I put the oil filler cap back on to prevent anything falling in by accident.

The oil breather is located in the top left hand corner facing the engine bay and is held on with 3 bolts and 1 bolt holding the side pipe


Undo the bolts and lift up and then twist off the side pipe (with green washer)

As you can see not much difference between new and old



Upon closer inspection I found the rubber diaphragm on the old one easier to push with my finger than on the new one as it had a bit more resistance. I can only presume this is what wears out after time and may cause it to not work as it should. Its difficult to see in the pic but the new rubber diaphragm looks slightly thicker than old one




Refitting is the reversal of the above. This took me 20 minutes to do as I have removed it before but take your time
(If you are not comfortable at doing this please get a pro to do it as I accept no responsibility)

Any questions please feel free to ask

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      06-02-2012, 03:30 AM   #2
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That's a great DIY thanks very much.
Did you change the breather pipes? They are detailed in this thread?
http://www.e90post.com/forums/showthread.php?t=595716
Looking at all the photos the pipes and breather are not blocked And are unlikely to do so - unlike previous BMW breather designs.
If highlandpete or someone else with a more technical mind sees this thread can you comment on why this is seen as a problem area ( Breather blockages) because I can't see where the problem could occur.
Thanks again.

Last edited by Stringbag; 06-11-2012 at 05:59 AM.
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      06-02-2012, 11:37 AM   #3
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Hi mistryn, thanks for the write up. When I took my car in for a service the dealership also advised that the engine breather needs replacing at the 60k mark.
Could I ask how much the part you replaced was please? The dealership has quoted 100 for the job.

Also where are the hoses that also need checking please?
An excellent write-up, I may give it a go myself..
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      06-02-2012, 11:42 AM   #4
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Love seeing DIY done this well................thanks for the write up
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      06-02-2012, 03:21 PM   #5
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thsnks guys, the breather cost me 40 after discount 10%. just on my phone at the mo but will put some links up tommorow for which pipes to check
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      06-11-2012, 05:59 AM   #6
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Quote:
Originally Posted by Stringbag View Post
That's a great DIY thanks very much.
Did you change the breather pipes? They are detailed in this thread?
http://www.e90post.com/forums/showthread.php?t=595716
Looking at all the photos the pipes and breather are not blocked And are unlikely to do so - unlike previous BMW breather designs.
If highlandpete or someone else with a more technical mind sees this thread can you comment on why this is seen as a problem area ( Breather blockages) because I can't see where the problem could occur.
Thanks again.
Any more news on this?
I'm all for preventative maintenance but can't see the issue here. Your old breather looks ok really. Is there any way the plastic pipe and rubber hose can become blocked? (see the link to the post above?)
Thanks again for this detailed DIY
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      06-11-2012, 12:34 PM   #7
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Apology I must have over looked this thread. I just replaced the oil breather pipe, I did not look in detail at the breather hose as detailed in the above link. I did a quick visual inspection and from what I seen it was fine, there was no damage/oil leak.

However i did add a jubille clip as Jimmy did in his thread. If you follow the hose from the breather all the way down (will have to remove airbox) you will see it just push fit just above the red boost pipe. With mine it was loose, I could literally just pull it off with hardly any resistance. So I added a jubilee clip just to tighten it up and to ensure no oil/air leak - my BMW specialist did spot that on routine check of the engine bay when I took it in to have a look at the oil sump leak

I dont think that pipe in the link can become totally blocked but more like the way it seal at each end could deteriate and not make a good seal

No-ball - if you have a look at the above link you will get an idea which hose to look at. The best way is to get the engine cover off and have a good look around.

Reagrding my original problem of oil leak around the sump, I have had a quick look again (since replacing the breather) and there does not seem to be excessive oil as pre oil breather pipe change. I have cleaned it off again and will monitor but I am pretty sure the breather pipe was the cause of it blocking (even though its good for life) causing pressure and oil building up in the inlet manifold and dripping down the side.

can someone confirm the extra oil in the inlet manifold will eventually find its way down to the sump?
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      10-11-2012, 01:51 PM   #8
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Mistryn – excellent write up!

I have a quick query which mainly based on the new recommended Vent pipe required to be purchased in conjunction with the breather.

What year of model 335d do you have? I understand some vehicles caught the new revised breather before leaving production.

BMW recommend (and would if required to replace at BMW garage) that the new revised breather should be bought in conjunction with the new vent pipe (OEM code for the vent is 1127809513). I am not how different the new vent pipe is in relation the revised breather and whether a purchase of the breather would fit on the old vent pipes?

I intend on replacing both the Breather and the Vent Pipe as recommended by BMW.

Has anyone replaced the vent pipe? If so, any advice or directions to walk through would be helpful

Anyone else is welcome to input on this as we are all or will be in the same boat at some point.
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      10-11-2012, 02:09 PM   #9
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No probs Ek, mine is April 2008 model so I believe they did make the change around the 2008 mark.

The vent pipe in my case was fine and did not need replacing as that doesnt get blocked its the actual breather part. Some people have replaced theirs as it was slightly deformed around the connection onto the turbo side.

It is quite easy to check and replace once the breather pipe is out, just follow the pipe that connects onto the breather/around the oil filler cap and down to the turbo and it just pulls off - yes I did say it pulls off. Who thought at BMW engineers would have tried to make a secure connection but anyway thats a different story lol

In my picture above when I mention to twist the side pipe off, that is your vent pipe

My reccomendation would be to have a look before you buy the vent pipe and this is something you can change with a bit of DIY skill
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      03-29-2013, 08:13 PM   #10
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I've noticed that there is light brown mayo like stuff on the oil cap.
First thought that it's the head gasket but cant' see any leaks.
Weather has been really cold for a long time as you'll know and only being doing little runs and I'm thinking this is the problem, but now looking at this thread I'm wondering if this is a symptom of a blocked pipe?
Regards
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      09-03-2013, 10:05 AM   #11
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mistryin, where did you buy this? i need to do this.........did you tune your car already? i plan, but cost conscious....am even looking to do it myself...
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      09-03-2013, 11:19 AM   #12
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bbstoke - i am not sure if this could be the case in your situation but give it a swap and see?

Martin - I brought the breather part from BMW dealer - please see pics at the top for the part number. When i did this the car was standard and not tuned. It is quite an easy job to do if you can take plastics casing off as iirc its held on by 3 bolts
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