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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 Sun, May-08-2011, 06:50:53 PM   #41
glowz825
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Default Re: Differential Bolts replacement DIY: updated bolts

I was in the process of doing this today, then as I was backing out the 1st bolt I saw that I have the updated bolts already, which is suprising because my car has an mfr date of 4/01
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Old Sun, May-15-2011, 05:22:18 AM   #42
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Default Re: Differential Bolts replacement DIY: updated bolts

changed my bolts today, thanks for the diy....
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Old Sat, Jun-11-2011, 07:03:00 PM   #43
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Default Re: Differential Bolts replacement DIY: updated bolts

Is there an updated bolt for the front? When you guys did this were the diff bushings fine or sloppy? I'm debating whether to replace the bushes when I do the bolts. So, how did you find the torque value of 61ft/lbs when the BMW manual has the specs I listed? Are these peculiar to the new bolts???
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Old Wed, Jun-15-2011, 04:30:57 AM   #44
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Default Re: Differential Bolts replacement DIY: updated bolts

Quote:
Originally Posted by spr12 View Post
Pretty sure the torque settings are wrong. TIS has them at 200nm front and 20nm joint torque and 90 degree torque angle for rear as it is an e46/s54.

Also have you ispected the bushings? They are rubber and there is a removal install procedure in the TIS...

1AZ Final drive to rear axle carrier

E46 / S54, E85 / S54, E86 / S54 Front Observe repair instruction. 200 Nm

rear:

E46 / S54, E85 / S54, E86 / S54 Rear Observe repair instruction.

Jointing torque 20 Nm

Torque angle 90
It's 200 Nm for the front and what is the rear spec? TIS only states jointing torque 20 Nm and angle at 90 degrees, but this means nothing without the spec. For E46 it lists 174 Nm (128 ft-lb) but notes (except S54), so that is for non-M.

Does anyone know the correct torque spec for the rear bolts? OP's 61 ft-lb only translates to ~82.7 Nm. If the front one is at 200 Nm, that is surely a low spec for the rear? Most specs I have seen for M3 are usually more than the non-Ms especially for drive line components.
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Old Thu, Jun-16-2011, 04:13:54 AM   #45
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Default Re: Differential Bolts replacement DIY: updated bolts

Quote:
Originally Posted by genuity View Post
It's 200 Nm for the front and what is the rear spec? TIS only states jointing torque 20 Nm and angle at 90 degrees, but this means nothing without the spec. For E46 it lists 174 Nm (128 ft-lb) but notes (except S54), so that is for non-M.

Does anyone know the correct torque spec for the rear bolts? OP's 61 ft-lb only translates to ~82.7 Nm. If the front one is at 200 Nm, that is surely a low spec for the rear? Most specs I have seen for M3 are usually more than the non-Ms especially for drive line components.
Figured it out--DO NOT EXCEED 69 ft lbs! Ask me how I know Op's torque spec of 61 ft lbs (82 Nm) is a safe one to go with--that is max torque spec for 8.8 grade for an M12 according to the Bentley (page 010-7). If you are also concerned, use some red loctite.

The only difference between the process of torquing it compared to the E46 (non-M) which states except S54, is the method of torquing. S54 models, what is referred to in the "observe repair instructions" is the requirement for pre-loading. Insert bolt through bushing into diff but do not torque it yet. Remove any external support on the diff, that is remove anything you placed under it to support the weight, so now let it hang there in the inserted bolts. Now torque it down to specs.

Both non-M and M require pre-loading (with it's own weight) the diff before torquing down, but just the Ms require the jointing torque and torque angle.


EDIT: BEWARE OF THIS 174 Nm TORQUE SPEC FROM TIS. IT IS NOT ACCURATE!


Attached Images
File Type: png E46-rear-diff-torque-spec.png (8.8 KB, 1680 views)

Last edited by genuity; Sat, Jun-18-2011 at 06:28:22 PM. Reason: torque spec--ask me how I know, one bolt sheared right off even before hitting 110Nm.
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Old Mon, Jun-20-2011, 08:09:26 PM   #46
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Default Re: Differential Bolts replacement DIY: updated bolts

In case someone runs across this later...

Just got the specs from a BMW shop foreman. Official spec for those rear bolts is 20 Nm and front diff is 200 Nm (which we already know that).
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Old Mon, Jun-20-2011, 08:13:25 PM   #47
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Default Re: Differential Bolts replacement DIY: updated bolts

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!!!!
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Old Mon, Jun-20-2011, 08:28:29 PM   #48
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Default Re: Differential Bolts replacement DIY: updated bolts

Quote:
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!!!!
Thanks--their chart is a bit confusing...wish they had put a separating line in it! This would have made a big difference! Since I already overtorqued the rear diff subframe mounts , I think it maybe wise that I stay with the OP's 61ftlbs (82 Nm) and my red loctite. I was just very lucky not to have stripped the threads completely, otherwise I would be looking at trying to get helicoils in there.
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Old Mon, Jun-20-2011, 08:40:17 PM   #49
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Default Re: Differential Bolts replacement DIY: updated bolts

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.
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Old Mon, Jun-20-2011, 08:41:12 PM   #50
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Default Re: Differential Bolts replacement DIY: updated bolts

There is also a specific order for installation and removal of the bolts... I think the front must go in first then rears. I'd consult the proper BMW guides...
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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)