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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 Thu, May-16-2019, 06:44:59 PM   #1
Whitehawk8
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Default Snapped the UPDATED diff bolt

Essentially I was finishing up a track day. On the last session I floor it and hear the typical noise in the back.

Im taking a look in the paddock when I see half the bolt stuck in the subframe. Anyways I got home 130 miles away by ratchet strapping the diff to the subframe. Ill include a picture for your amusement. Id recommend doing this instead of paying for a tow, only took 30 minutes and saved me over $600 for a tow. Just be sure to drive VERY easy on the way home or to your shop or the straps may break from the torque.


Anyways here's my theory. I kept hearing a sliiiiight tapping noise first thing in the morning when pulling away in 1st gear. My e-brake is sorta noisy so I just dismissed it as that. This noise existed for 2 weeks maximum. Is it possible the old bolt backed out?

The shop I took it to says the bolt didn't in fact back out but simply snapped because of my bushing setup. I have rubber bushings everywhere except for my subframe bushings which are solid. My RTABs are the CMP ones with a rubber sleeve inside.

So, who can help diagnose my problem?!
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Old Thu, May-16-2019, 07:08:18 PM   #2
kaiv
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Default Re: Snapped the UPDATED diff bolt

Was the proper installation sequence followed?

Insert front bolt
Insert rear bolts
Tighten front bolt (200 NM)
Tighten rear bolts (20nm, 90 degrees)
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Old Fri, May-17-2019, 03:48:51 AM   #3
Whitehawk8
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Default Re: Snapped the UPDATED diff bolt

Quote:
Originally Posted by kaiv View Post
Was the proper installation sequence followed?



Insert front bolt

Insert rear bolts

Tighten front bolt (200 NM)

Tighten rear bolts (20nm, 90 degrees)


That Iím not sure of. I will need to ask the shop
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Old Sun, May-19-2019, 12:17:17 AM   #4
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Default Re: Snapped the UPDATED diff bolt

In the same boat here! Didn’t race, was pulling away from light and passenger side bolt head snapped.

Any idea how your shop will get it out?

Btw, bolts were “new” design. And original bushings.
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Old Sun, May-19-2019, 02:33:35 AM   #5
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Default Re: Snapped the UPDATED diff bolt

I would use a stiffer bushing at least for the bolt most prone to snapping. Use 10.9 or 12.9.
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Discussing Snapped the UPDATED diff bolt 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)