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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, Aug-07-2011, 07:52:29 PM   #41
Rausch
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Default Re: Differential seals leaking? Pictures

Bumping this because I noticed some seeping when changing my doff bolts. I ordered the seal, but had one question:

Does the axle need to be removed completely to get the flange out? From what I could see, it appears that is the case. Not sure if the axle will come out of the hub without disconnecting at least part of the rear suspension. Any input while my seal is in transit?
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Old Wed, Sep-09-2015, 04:02:43 PM   #42
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Default Re: Differential seals leaking? Pictures

Thread revival.... I've noticed a few drips under the rear of car the last few weeks. How long can I let this go (weeks, months, etc.)? Should I have an indy shop check level and add diff oil if needed until I have extra funds for replacement of the seals?
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Old Wed, Sep-09-2015, 04:31:13 PM   #43
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Default Re: Differential seals leaking? Pictures

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Originally Posted by PiL View Post
Thread revival.... I've noticed a few drips under the rear of car the last few weeks. How long can I let this go (weeks, months, etc.)? Should I have an indy shop check level and add diff oil if needed until I have extra funds for replacement of the seals?
it's a common problem but the leak is generally limited to oil on the differential itself (very slow leak). so if you have a few drips on the ground i would consider that a lot and to not wait too long to correct. the seals are cheap but the oil and labor is expensive. good luck
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Old Wed, Sep-09-2015, 06:55:12 PM   #44
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Default Re: Differential seals leaking? Pictures

If you are going to be under the diff, change ALL THREE SEALS - the front pinion seal, and the output shaft seals.
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Old Thu, Sep-10-2015, 02:55:22 PM   #45
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Default Re: Differential seals leaking? Pictures

Whatever you do, take a very good notice of position of old seals before you take them out. With that being said, DO NOT tap the new seal all the way in like you would on other cars. Otherwise you'll have a major leak of diff fluid
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Old Thu, Sep-10-2015, 02:59:30 PM   #46
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Default Re: Differential seals leaking? Pictures

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Whatever you do, take a very good notice of position of old seals before you take them out. With that being said, DO NOT tap the new seal all the way in like you would on other cars. Otherwise you'll have a major leak of diff fluid
GOOD MAN for remembering this. I did not do this, assumed to tap them all the way, and then had to take everything apart again. Needless to say, I was pretty pissed.

You will also need a large socket or something that is the same size as the seal to tap it in with. I used a cup from a ball joint puller
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Old Thu, Sep-10-2015, 05:21:40 PM   #47
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Default Re: Differential seals leaking? Pictures

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GOOD MAN for remembering this. I did not do this, assumed to tap them all the way, and then had to take everything apart again. Needless to say, I was pretty pissed.

You will also need a large socket or something that is the same size as the seal to tap it in with. I used a cup from a ball joint puller
I preach this every time I see someone talking about diff seals, since I made the same mistake. Luckily I noticed oil leak very shortly and saved my diff
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Old Thu, Sep-10-2015, 05:32:32 PM   #48
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Default Re: Differential seals leaking? Pictures

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I preach this every time I see someone talking about diff seals, since I made the same mistake. Luckily I noticed oil leak very shortly and saved my diff
please please please follow this advice. my diff seals were pressed too far and caused a major oil leak resulting a seized diff. had to buy a new one and it wasnt cheap....on the other had it was a good way to justify 3.91 gears haha.
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Old Thu, Sep-10-2015, 06:08:25 PM   #49
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Default Re: Differential seals leaking? Pictures

I did my pass side seal twice. The seal should be maximum of 1/4" (ideally probably half that)inside the shaft. And the reason I had to replace the seal twice because it wasn't sitting perfectly straight, it's suppose to be at 90* to ensure proper seal all around. It was a bit of pita to align/install it as there isn't much room to work with
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Discussing Differential seals leaking? 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)