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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, May-15-2011, 07:42:16 AM   #41
ImolarotII
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Default Re: Differential Seal Leak (with pictures)

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Originally Posted by Dan Rodriguez View Post
It looks like a bad driver's side diff output seal.

This is the part you need: http://www.pelicanparts.com/cgi-bin/...5%29%2C%20Each

These are the two DIYs that I bookmarked for later use: http://m3forum.net/m3forum/showthread.php?t=218070

http://m3forum.net/m3forum/showthread.php?t=230322

I have the same leak, although not as bad as yours. I have the parts waiting to install. It just hasn't been a priority yet.


Thank you for info! When do I know if I my diff needs a rebuild? Not saying that someone inspected it and I was recommended to do it but, what are the signs of a bad diff?

I know the M3 has a slight clunk once in awhile. But is there any other test I can do?

Honestly, driving the car is fine, I never knew the leak until I had an oil change today, lifted the car up and saw that.

Thank you!
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Old Sun, May-15-2011, 02:14:11 PM   #42
Dan Rodriguez
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Default Re: Differential Seal Leak (with pictures)

I'm sure your diff is fine. This seems to be a very common leak. Most of the diff problems I have read about are simple groaning and grinding. And most of those problems are solved by draining the fluid and filling it with OEM diff fluid. I would just fix the leak if it bothers you (that's what I plan on doing). If it doesn't bother you much, I would just keep an eye on the diff fluid level and continue to drive it. There are plenty of people driving around with diffs like yours and mine. I'd bet that most of them do not even know it.
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Old Sun, May-15-2011, 06:27:46 PM   #43
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Default Re: Differential Seal Leak (with pictures)

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Originally Posted by Dan Rodriguez View Post
I'm sure your diff is fine. This seems to be a very common leak. Most of the diff problems I have read about are simple groaning and grinding. And most of those problems are solved by draining the fluid and filling it with OEM diff fluid. I would just fix the leak if it bothers you (that's what I plan on doing). If it doesn't bother you much, I would just keep an eye on the diff fluid level and continue to drive it. There are plenty of people driving around with diffs like yours and mine. I'd bet that most of them do not even know it.
Got it!

This sounds stupid but, how do you check your diff fluid level? I'm going to assume you need to drain it?
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Old Sun, May-15-2011, 07:25:30 PM   #44
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Default Re: Differential Seal Leak (with pictures)

Quote:
Originally Posted by Dan Rodriguez View Post
It looks like a bad driver's side diff output seal.

This is the part you need: http://www.pelicanparts.com/cgi-bin/...5%29%2C%20Each

These are the two DIYs that I bookmarked for later use: http://m3forum.net/m3forum/showthread.php?t=218070

http://m3forum.net/m3forum/showthread.php?t=230322

I have the same leak, although not as bad as yours. I have the parts waiting to install. It just hasn't been a priority yet.

From the picture it looks like that's the passenger side. I'm not an expert but I can't really tell where it's leaking from that particular picture. But if it is, I would say it's the passenger side since we can't even see the driver's side in that picture.
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Old Sun, May-15-2011, 07:28:14 PM   #45
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Default Re: Differential Seal Leak (with pictures)

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Originally Posted by ImolarotII View Post
Got it!

This sounds stupid but, how do you check your diff fluid level? I'm going to assume you need to drain it?

With the car level, you unscrew the top filler screw and stick your finger in, if you touch fluid then you're full. If not then fill until the fluid overflows out. There are two hex screws in your picture...it's the one on top.
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Old Mon, May-16-2011, 02:39:24 AM   #46
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Default Re: Differential Seal Leak (with pictures)

You're right. It's on the passenger's side. Which is a good thing as that is the easier seal to change.
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Old Tue, May-17-2011, 06:58:24 AM   #47
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Default Re: Differential Seal Leak (with pictures)

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Originally Posted by I M Legend View Post
From the picture it looks like that's the passenger side. I'm not an expert but I can't really tell where it's leaking from that particular picture. But if it is, I would say it's the passenger side since we can't even see the driver's side in that picture.

Not sure if this is a good picture, but this is the passenger side.




Driver side


Last edited by ImolarotII; Tue, May-17-2011 at 07:40:39 AM.
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Old Thu, Sep-29-2011, 05:19:06 PM   #48
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Default Re: Differential Seal Leak (with pictures)

hello,
sorry for bring the post up again
I have a bad leak as well on the drive side.
I have the BMW motorsport 4.1 diff, does it use the same seal as the OEM seal? if so, i just need to get the seal that you guys mentioned before???
please help
thanks
Nick
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Old Thu, Sep-29-2011, 08:27:54 PM   #49
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Default Re: Differential Seal Leak (with pictures)

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Originally Posted by love67 View Post
hello,
sorry for bring the post up again
I have a bad leak as well on the drive side.
I have the BMW motorsport 4.1 diff, does it use the same seal as the OEM seal? if so, i just need to get the seal that you guys mentioned before???
please help
thanks
Nick
Yes Nick, OEM seal. Make sure you do not tap it in too far. If you do, it will leak again. Good luck. I have had zero leakage since changing mine.

Mr. Wolfe
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Old Fri, Sep-30-2011, 01:28:52 AM   #50
love67
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Default Re: Differential Seal Leak (with pictures)

thank you very much Mr. Wolfe
this is the only part that i need right?
http://www.pelicanparts.com/cgi-bin/...5%29%2C%20Each
thanks again
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Discussing Differential Seal Leak (with pictures) in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)