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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 Mon, Jun-20-2011, 07:52:39 PM   #51
genuity
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Default Re: Differential Bolts replacement DIY: updated bolts

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Originally Posted by spr12 View Post
Did you use the new bolts? They're cheap. FYI there are updates for all 3. Just get new ones and do it correctly. Did you do the center bearing and guibo at same time?

I'm going to redo all the rear end bushes, install adj control arms and do center bearing and guibo along with diff bolts all at same time.
I replaced and am replacing everything that is a maintenance item including the old rusty bolts and nuts while I am in there...no sense in doing things twice! Also rebuilding axles and thinking about repacking the drive shaft CV joint if possible.
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Old Wed, Jun-22-2011, 02:07:25 AM   #52
M Nectar
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Default Re: Differential Bolts replacement DIY: updated bolts

Upgraded bolts on my 2004 this afternoon. Thanks for the great DIY! Note for those doing the upgrade: the space is super tight and a swivel is a must. After breaking the bolts free, adjust the jack on the diff until the bolt can be turned by hand. I.e. you won't have space to take the bolt out with the E14 + swivel, so get the holes lined up and it's super easy.

Thanks again!
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Old Sun, Sep-25-2011, 03:45:07 AM   #53
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Default Re: Differential Bolts replacement DIY: updated bolts

I did this tonight. The inside of the bushings is made oval like that, and there were no marks from the threads of the bolt at all. Also they were perfectly tight on my 05 M3, but I changed them anyway and used a little blue loctite.

I was thinking of doing the front also since I bought the bolt, but I can't seem to find it... the one bushing I could feel doesn't have this torx bolt, it's a hex head.

Anyway, it's pretty easy. I don't expect to feel anything different since it was fine already.
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Old Mon, Oct-03-2011, 11:56:26 PM   #54
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Default Re: Differential Bolts replacement DIY: updated bolts

note that using a swivel (univeral joint or extension) on your torque wrench makes it less accurate
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Old Tue, Oct-04-2011, 12:12:35 AM   #55
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Default Re: Differential Bolts replacement DIY: updated bolts

why the heck are we changing out diff bolts now?

I thought backing out bolts were vanos only thing..
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Old Tue, Oct-04-2011, 12:31:57 AM   #56
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Default Re: Differential Bolts replacement DIY: updated bolts

I've had the right side diff bolt snap a while ago. With the diff hanging from only one side it made quite a racket. Thankfully I was able to backout the broken part out easily. They were the the old bolts, I replaced them with the upgraded ones.
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Old Tue, Oct-04-2011, 12:44:06 AM   #57
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Default Re: Differential Bolts replacement DIY: updated bolts

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Originally Posted by spr12 View Post
The numbers are correct, however see my last post... The 20nm also has an angle measurement as it is a stretch bolt. E.g., 20nm then X degrees thereafter!!! Huge difference!!!!
for the rear, go right to 61ftlb? or to 20nm then 90 degrees further?
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Old Tue, Oct-04-2011, 07:07:45 AM   #58
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Default Re: Differential Bolts replacement DIY: updated bolts

Just did this last weekend. The factory bolts were tight and all, but I have noticed a huge decrease in clunk noise upon shifting. I did it the night before I went to a lapping day, drove the whole day with the SMG on 5 or 6, and didn't notice any clunk at all. I don't know why this worked, but it was worth the $9 in bolts or whatever pittance it cost. Took all of 15 minutes. Definitely get the jack on the diff to relieve the pressure off the bolts, it makes everthing a lot smoother.
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Old Tue, Nov-08-2011, 05:06:45 PM   #59
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Default Re: Differential Bolts replacement DIY: updated bolts

Is there a cut off date on when BMW started producing M3's with the improved bolts? Or were they released after the M3's production run ended?
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Old Tue, Nov-08-2011, 05:08:33 PM   #60
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Default Re: Differential Bolts replacement DIY: updated bolts

Dunno but I have a very late 05 - 9.05 and it had the old ones front and rear...
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Discussing Differential Bolts replacement DIY: updated bolts 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)