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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 09-30-2010, 11:21 AM
seaver seaver is offline
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differential breather

hey, i have been looking for my rear differential breather on my 2005 325i and can not find it. If someone could tell me where it is located that would be great. thanks.
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  #2  
Old 09-30-2010, 12:15 PM
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It`s right next to Sasquatch, IIRC....
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Old 09-30-2010, 01:09 PM
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Are you racing your car? Having diff oil starvation problems going around the corners?
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  #4  
Old 09-30-2010, 01:38 PM
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Your what?
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  #5  
Old 09-30-2010, 03:18 PM
seaver seaver is offline
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No just normal driving. I think that it might be plugged because i just changed out my front diff seal and now i am getting a small leak on the right side of the diff. Where the output shaft to the right wheel comes out........The differential breather like a vent to the outside air.
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  #6  
Old 09-30-2010, 07:38 PM
Starless Starless is offline
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Quote:
Originally Posted by seaver View Post
No just normal driving. I think that it might be plugged because i just changed out my front diff seal and now i am getting a small leak on the right side of the diff. Where the output shaft to the right wheel comes out........The differential breather like a vent to the outside air.
While many cars have this part, I do not think e46 has it at all (I've never heard it mentioned). But if you find it let us know :-)
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  #7  
Old 09-30-2010, 07:48 PM
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Originally Posted by Starless View Post
While many cars have this part, I do not think e46 has it at all (I've never heard it mentioned). But if you find it let us know :-)
C`mon, Alex....it`s right next to the Bushing Intercooler....
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  #8  
Old 10-01-2010, 09:38 AM
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Quote:
Originally Posted by seaver View Post
hey, i have been looking for my rear differential breather on my 2005 325i and can not find it. If someone could tell me where it is located that would be great. thanks.
If your looking for a legitimate way to keep your differential temperatures down, you might want to consider a finned differential cover.

We have created a complete upgrade kit, including fluid and drain plugs.

Includes the following:
* Aluminum finned differential cover
* Drain & fill plug with sealing o-ring
* 2 Quarts of Redline 75w90

Click HERE for more information.

Feel free to shoot us a PM if you have any questions!

Best,
Joe
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Last edited by ECSTuning; 10-01-2010 at 09:40 AM.
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  #9  
Old 10-01-2010, 12:37 PM
seaver seaver is offline
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C`mon, Alex....it`s right next to the Bushing Intercooler....
Man you are dumb, so dumb.
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  #10  
Old 10-01-2010, 12:44 PM
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Man you are dumb, so dumb.
Hey....YOU`RE the one who posed the question, Einstein....
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  #11  
Old 10-01-2010, 12:57 PM
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Originally Posted by seaver View Post
Man you are dumb, so dumb.
Breathe. You asked where something is on an E46 that to the best knowledge of a couple of the more knowledgeable guys here doesn't exist on our cars -- of course there's going to be some kidding. None of it was over the line.

Do yourself a favor: find the differential iron lung, er, breather, post a pic of it here and then start calling people dumb. Until then...
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  #12  
Old 10-01-2010, 01:25 PM
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Man you are dumb, so dumb.
You gotta relax dude. Show us this differential breather.

Pics or fail!
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  #13  
Old 10-01-2010, 01:44 PM
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I just walked out to the garage and looked over my 3.07 diff, removed from the car, and there is no such breather.
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  #14  
Old 10-01-2010, 02:05 PM
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Well, give the guy a break. The OP must be coming from a 4x4 truck that use differential breather valves or vents. He assumed all cars did.

OP, no such animal on e46 differential
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  #15  
Old 10-01-2010, 02:57 PM
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Well, give the guy a break. The OP must be coming from a 4x4 truck that use differential breather valves or vents. He assumed all cars did.

OP, no such animal on e46 differential
Starless = The Voice Of Reason.....

(Now go shine up your halo, Alex :-)
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  #16  
Old 10-01-2010, 08:19 PM
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It's there just like Fastbob said
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  #17  
Old 10-01-2010, 08:22 PM
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Man you are dumb, so dumb.

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  #18  
Old 10-02-2010, 10:12 PM
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I came across this post on Fanatics

"No need to check the fluid. If there is no visible leak or stains the fluid will NOT go anywhere, it will not burn up like in the motor. It will stay there FOREVER if a leak is not present. Even thought there is a vent hole in the diff, its up high and very unlikely the fluid can reach it. I had an experience where I put my extra diff that I have in my garage and for some reason I put it upside down(dont ask my why),a few days later when I walked in my garage I find a tiny tiny oil spill right under and it turns out that I discovered a vent hole in the diff.

Anyway, back to the topic, dont worry OP its fine."


It's from this thread: http://forum.e46fanatics.com/showthread.php?t=794940

Now I do not know who's crazy (if a vent hole can be considered a breather vent of course)
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  #19  
Old 10-03-2010, 01:37 AM
NoMercy346 NoMercy346 is offline
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AFAIK every diff/trans has to have a breather hole, else the pressure would go up inside the housing as the parts and fluid heat up. I thought this was common knowledge, or are there really completely sealed units arround?

I have certainly found the breather hole on my diff housing. You can't see the hole from beneath, but you can see an area with a fine coat of oil mist on top of the housing. There was even a thread on here with someone asking about a hose, not fitted to all cars, that goes on there that also shows up on real oem.
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  #20  
Old 10-03-2010, 02:26 AM
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  #21  
Old 10-05-2010, 12:49 PM
seaver seaver is offline
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thank you for the help, much appreciated.
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  #22  
Old 10-05-2010, 05:54 PM
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The xi has a tube running from the breather to allow deeper water fording, from what I understand.
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  #23  
Old 12-08-2014, 02:18 PM
Seaver10 Seaver10 is offline
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Here is a picture of the breather hole for all of you none believers out there. If this hole gets plugged up with snow or dirt the pressure in the diff will rise and may blow a seal.

For next time make sure you know what you are talking about before thinking you know it all.
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  #24  
Old 12-08-2014, 02:56 PM
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Originally Posted by Seaver10 View Post
Here is a picture of the breather hole for all of you none believers out there. If this hole gets plugged up with snow or dirt the pressure in the diff will rise and may blow a seal.

For next time make sure you know what you are talking about before thinking you know it all.
Finally emerged from that four-year coma, eh ?
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  #25  
Old 12-08-2014, 04:09 PM
Seaver10 Seaver10 is offline
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This is the first time I had to pull the diff out. Sorry it took so long. But I'm glad I could teach you something. Einstein
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