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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 Tue, Jun-26-2018, 07:51:33 PM   #1
dothraki
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Default Is there a weep hole in the front of the differential?

I have this spare diff (under 20K miles) that I got as a backup and I have it sitting in the garage floor. I know there is a weep hole on each of the sides connecting to the wheels and another weep hole on the diff cover.

Is there a weep hole in the front end? Just want to make sure that it's not really leaking due to a seal. Here's what it looks like.
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Old Tue, Jun-26-2018, 08:20:20 PM   #2
Braymond141
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Default Re: Is there a weep hole in the front of the differential?

I have an E60 M5 diff sitting exactly like that and a good wet spot as well. My assumption was seal, and it had signs of weepage before I washed it all.

Here's a shot of the E46 diff I did. That hole you see is to feed and drain the front bearing.



And the pinion seal


Last edited by Braymond141; Tue, Jun-26-2018 at 08:39:14 PM.
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Old Tue, Jun-26-2018, 09:00:02 PM   #3
dothraki
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Default Re: Is there a weep hole in the front of the differential?

Thanks. Does that mean the pinion seal is a complete seal and would changing it affect backlash settings?
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Old Tue, Jun-26-2018, 09:14:19 PM   #4
Braymond141
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Default Re: Is there a weep hole in the front of the differential?

Quote:
Originally Posted by dothraki View Post
Thanks. Does that mean the pinion seal is a complete seal and would changing it affect backlash settings?
If you can remove and reinstall the input shaft nut to the exact original position you will be fine.
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Discussing M3 E46 Pre Cat O2 sensor replacement... 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)