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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Thu, Aug-24-2017, 09:14:09 PM   #11
NolliM3
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Default Re: Differential leak

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Originally Posted by JitteryJoe View Post
You trying to get the drain & fill plugs out?
There is a tool for this.
http://www.pelicanparts.com/cgi-bin/...%37%20mm%20Box
JitteryJoe...that tool price is outrageous and wouldn't budge this nut...it needs a breaker-bar...here are the tools I have tried!





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Old Fri, Aug-25-2017, 04:18:53 AM   #12
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Default Re: Differential leak

Confirmed with the Home Depot Store that this is the low profile model, and it has total height of one inch.

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Last edited by NolliM3; Fri, Aug-25-2017 at 04:23:08 AM.
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Old Fri, Aug-25-2017, 11:55:31 AM   #13
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Default Re: Differential leak

That will work but you can also just cut an inch off a regular socket or hex key (hack saw is slow so try a grinder with 1/16 cutting disc) and use a 14mm box end on it.

I bought a set of low profile on sale a few years ago but still have my cut down original tool.
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Old Fri, Aug-25-2017, 02:12:25 PM   #14
haus
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Default Re: Differential leak

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Originally Posted by NolliM3 View Post
JitteryJoe...that tool price is outrageous and wouldn't budge this nut...it needs a breaker-bar...here are the tools I have tried!
<snip>

If that first pic is yours (i.e., you've got a method of getting a socket in there past the tire well and it seats well in the diff plug), then just google the double-wrench technique if all you're missing is leverage. You should be able to easily extend that wrench without need for a breaker bar.

I wouldn't do it with a ratcheting box end wrench though; see if you can use a standard wrench. IIRC the torque on those plugs is 42lb ft*, which is a decent torque but nothing that should require a breaker bar.

*per Bentley, but it's not in front of me
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Old Sat, Aug-26-2017, 06:55:21 PM   #15
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Default Re: Differential leak

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Originally Posted by haus View Post
If that first pic is yours (i.e., you've got a method of getting a socket in there past the tire well and it seats well in the diff plug), then just google the double-wrench technique if all you're missing is leverage. You should be able to easily extend that wrench without need for a breaker bar.

I wouldn't do it with a ratcheting box end wrench though; see if you can use a standard wrench. IIRC the torque on those plugs is 42lb ft*, which is a decent torque but nothing that should require a breaker bar.

*per Bentley, but it's not in front of me
Thank you Haus...yes, it's leverage that's needed...I tried the regular wrench; however, it seems that I was making progress...then realized the wrench was only just sliding off the allen. It will rain every day up to when the low profile socket allen wrench comes in...good to know of the double wrench technique.
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Old Sat, Aug-26-2017, 09:18:17 PM   #16
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Default Re: Differential leak

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Originally Posted by NolliM3 View Post
JitteryJoe...that tool price is outrageous and wouldn't budge this nut...it needs a breaker-bar...here are the tools I have tried!
I don't recall what I paid. It has been a few years. The tool is pretty stout. You can always add a length of pipe (a trolley jack handle works great) if you need more leverage. I found that the tool is enough if I am able to brace my body under the car so I don't slide around.
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Old Sun, Aug-27-2017, 06:24:32 PM   #17
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Default Re: Differential leak

You should not have to put much force in to remove that plug. The plugs in the diff should have crush washers on them and those should be replaced every time you remove them. Don't forget that the rear diff cover is aluminum and it will crack if those plugs are overtorqued.

It shouldn't require more than a swift whack with the palm of your hand on the wrench to break it loose. It sounds like someone overtorqued it big time. Be careful removing that if you're having problems with it.

Getting back to the original problem at hand, those output shaft seals are very easy to replace. The flanges pop right out with very little force, and you have access to it. Be very careful to make sure you don't scratch the metal behind the seal when you're removing it.

Don't mess with the front flange or seal. That has a nut on it that is torqued to a very specific point. If you remove it and reinstall it with normal tools you will destroy the bearing behind it.
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Old Sat, Sep-02-2017, 01:13:18 AM   #18
NolliM3
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Default Re: Differential leak

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Originally Posted by fiveightandten View Post
You should not have to put much force in to remove that plug. The plugs in the diff should have crush washers on them and those should be replaced every time you remove them. Don't forget that the rear diff cover is aluminum and it will crack if those plugs are overtorqued.

It shouldn't require more than a swift whack with the palm of your hand on the wrench to break it loose. It sounds like someone overtorqued it big time. Be careful removing that if you're having problems with it.

Getting back to the original problem at hand, those output shaft seals are very easy to replace. The flanges pop right out with very little force, and you have access to it. Be very careful to make sure you don't scratch the metal behind the seal when you're removing it.

Don't mess with the front flange or seal. That has a nut on it that is torqued to a very specific point. If you remove it and reinstall it with normal tools you will destroy the bearing behind it.
Thanks Nick...you were correct...it needed this (see below...available at home depot online 14mm long allen wrench $9) to get a solid handle and a swift whack...then I see that it wasn't tight at all. Glad for the tip not to mess with the front flange or seal.

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Discussing Differential leak in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)