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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 Wed, Feb-22-2017, 01:13:39 AM   #31
thirtysixnick
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Default Re: Leaking Rear Differential That Pops/Grinds/Cracks????

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Originally Posted by M3n00b View Post
I'm pretty sure one of mine backed out but the noise went away after a couple miles and then the rest backed out about 20,000 miles later

-tapa
LMAO

Should be good as I can make plenty to buy a new diff by then hahahaha. Right now, I'm straight OUT of cash so let's just pray it'll work for another few weeks after we get it on the street in a few days.

Last edited by thirtysixnick; Wed, Feb-22-2017 at 01:14:35 AM. Reason: added "hahahahahahahahahahaha" bc my car is funny L O L !
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Old Wed, Feb-22-2017, 01:16:41 AM   #32
M3n00b
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Default Re: Leaking Rear Differential That Pops/Grinds/Cracks????

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Originally Posted by thirtysixnick View Post
LMAO

Should be good as I can make plenty to buy a new diff by then hahahaha. Right now, I'm straight OUT of cash so let's just pray it'll work for another few weeks after we get it on the street in a few days.
Sucks about the cash flow problem. I remember those days well. Good luck

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Old Wed, Feb-22-2017, 01:45:38 AM   #33
fiveightandten
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Default Re: Leaking Rear Differential That Pops/Grinds/Cracks????

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I can't physically see any damage to be honest. I spun both wheels both ways while in the air and it really didn't seem to make the same plastic gnashing noise. I'm not getting my hopes up by any means though. Is there any sort of photo you could post or link you could give me to point me towards where the allen bolts are? I'm going to guess the only thing that backed out was just the head of the allen and that the rest of the allen is still popped in wherever it needs to be...

Thanks for the reply.
It's been a long times since I've been inside an E36 diff. Hopefully someone with a better memory will pop in. IIRC, you should be able to access the bolts, one at a time, by spinning the gears. If it were me, I'd probably just make sure they were tight and replace the one that backed out.

There's the option of removing them, one at a time, coating them with locktite, and re-installing. But these diffs have very tight tolerances and tend to be finicky. I wouldn't want to tell you to do that without talking to someone who knows more about them than I do. There's also the issue of residual gear oil making the locktite useless. It would be pretty hard to get it clean in there, so you'd had to use shots of brake cleaner and compressed air to clean each bolt and hole as you went.

Of course, there's the option of pulling the diff down and pulling it all apart. But I think that's beyond your skill set currently. It's a shame, because we have a fantastic DIY on doing this, but the photos are no longer there.

At any rate, you have to find the position where the bolt came out of. If there is still part of it in there, it will back itself out and cause problems. Spin the gears and have a look in there with a flash light.
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Discussing Leaking Rear Differential That Pops/Grinds/Cracks???? 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)