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Old 04-30-2019, 11:35 AM
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Mystery vent hose.....whereís it go

Reassembling my intake and fuel injection for startup after head gasket and have a vent hose that I canít recall where it goes. Oh, and itís an m54 3.0.

Hard pipe with a 5/16Ē ( I think) rubber connector. Old one seems in new condition so must be away from heat and oil.

Anyone? Thanks.


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Last edited by Oldmactech; 04-30-2019 at 11:41 AM.
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Old 04-30-2019, 11:44 AM
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Front diff breather.
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Old 04-30-2019, 11:46 AM
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Quote:
Originally Posted by Zulu95 View Post
Front diff breather.


Donít see a connector, need a clue?


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Old 04-30-2019, 11:50 AM
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Old 04-30-2019, 11:50 AM
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Think I figured it out. Must have come with the CCV rebuild kit, original is likely still installed but not looking at it right now.

Thanks.


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Old 05-02-2019, 02:17 AM
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Quote:
Originally Posted by Oldmactech View Post
Donít see a connector, need a clue?


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As Zulu stated already...it is the vent pipe for the front diff. And to verify that suggestion...you can see the last 7 digits of the pipe's part nbr (1 428 849) which you could enter using one of the online part databases. This would pull up the diagram that shows exactly where the part connects:



This vent pipe is also an oft asked question from new owners when they first explore the engine bay. Regardless if the V8 or I6...this vent tube is sticking out in the open unattached at the top...so the first thought is that it got dettached from something... but it's OK. It's supposed to be unattached. . You can see arrows pointing at this same front diff vent pipe on my 06 e53 X5 with the N62 V8 engine:

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Last edited by Qsilver7; 05-02-2019 at 02:34 AM.
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Old 05-02-2019, 07:43 AM
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Thanks, I get it but after looking around with a flashlight from up top yet to find the connection point at the front diff. Guess Iíll have to crawl under.


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Old 05-08-2019, 10:19 PM
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Quote:
Originally Posted by Oldmactech View Post
Thanks, I get it but after looking around with a flashlight from up top yet to find the connection point at the front diff. Guess Iíll have to crawl under.


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Forget about crawling underneath there ... that thing is sitting deep all the way down there...
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Old 05-09-2019, 09:38 PM
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I have an 04-06 4.8is and I'm near positive that's the front diff breather like mentioned. I just took that off and put it back on the front diff putting a new upper oil pan in. It's probably not going to ruin the car if you drive it with that off. The best place to see how to put it back on if the car is going to be in the drivers side front wheel well. If you can get the wheel off you should be able to see where it attaches, it's a tight fit in there trust me so look hard.


Here's an image that shows the differential out of the car so you know what shapes to look for and how the tube attaches. Your diff may be slightly different but not enough to notice...


https://www.railwayautospares.com/me...g_7064_1_2.jpg
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Old 05-09-2019, 09:40 PM
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Great- thanks. That is very helpful.


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