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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, Nov-01-2010, 07:08:51 PM   #1
lamboworld
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Default Differential backlash, preload and torque specs.

Anyone have these or know where I can find them?

I found this info on another board but I am unsure if the numbers are correct.

Ok here are some numbers. Note all these pertain to a 210mm diff.

Backlash
Before the rebuild my backlash was at 0.0045. Metric mechanic recommend 0.003-0.0035, TIS recommends 0.0024-0.0055 I went with 0.0040.

Pinion preload
My stock PP was 15 inlbs with a the seal in place. MM recommends 14-16 inlbs, TIS recommends 12-23 inlbs (Timken bearings) I went with 15 inlbs using timken bearings. This was measured with the pinion seal off.

Carrier preload
My stock CP was 11 inlbs. MM recommends 9-11 inlbs, TIS recommends 11-23 inlbs, I went with 11 inlbs

I cant seem to find the torque specs I used for the various bolts. I will update if I find them.

I used new timken bearings. If you need the part numbers I can dig those up as well.

Finally the gear pattern was checked be and after the rebuild and it was acceptable on both occasions
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Old Mon, Nov-01-2010, 09:04:08 PM   #2
lamboworld
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I have confirmed that these numbers are correct.

Now I need to find part numbers for the shims. Anyone
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Old Mon, Nov-01-2010, 09:39:32 PM   #3
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just have a machine shop make shims for you at the thickness you want
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Old Mon, Nov-01-2010, 09:47:08 PM   #4
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Quote:
Originally Posted by daver408 View Post
just have a machine shop make shims for you at the thickness you want

I apologize for the dumb question but what type of machine shop makes shims? Can you point me in the right direction.

Thanks
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Old Tue, Nov-02-2010, 12:53:56 PM   #5
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Originally Posted by lamboworld View Post
I apologize for the dumb question but what type of machine shop makes shims? Can you point me in the right direction.

Thanks
You should be able to use the shims from, I think, a ford 9in rearend. They don't have to be official bmw parts, just a similar diameter then using whichever thickness you need.
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Old Tue, Nov-02-2010, 12:58:48 PM   #6
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Do you happen to know the diameter of the BMW shims?
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Old Tue, Nov-02-2010, 02:47:14 PM   #7
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Quote:
Originally Posted by lamboworld View Post
I have confirmed that these numbers are correct.

Now I need to find part numbers for the shims. Anyone
Dude, I gotta ask why you're going through all this trouble?? You do not need to concern yourself with any of this.... a diff pro can handle all of this no problemo.... trust me

Just take the gears and the diff down to the shop and say "please install these." That's it... you're done.
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Old Tue, Nov-02-2010, 03:04:42 PM   #8
Jonathan 90 M3
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Originally Posted by EricSMG View Post
Dude, I gotta ask why you're going through all this trouble?? You do not need to concern yourself with any of this.... a diff pro can handle all of this no problemo.... trust me

Just take the gears and the diff down to the shop and say "please install these." That's it... you're done.
I'm under the assumption that he is installing the R&P himself so he is trying to track down everything he will need.

If a shop is indeed doing the install, then yes, they will handle this. By the same token, the OP could purchase any shims he'd need from a driveline shop...
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Old Tue, Nov-02-2010, 03:08:14 PM   #9
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"Side shims" or "carrier shims" are harder to track down, even diffsonline doesn't sell them singley...

There are bmw part numbers for a package of them within a range of thicknesses but there are 2 different packages at I think $110 each so if you know what range you need it is easier (and cheaper), than if you don't know what you need.
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Old Tue, Nov-02-2010, 03:12:39 PM   #10
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Quote:
Originally Posted by Jonathan 90 M3 View Post
I'm under the assumption that he is installing the R&P himself so he is trying to track down everything he will need.

If a shop is indeed doing the install, then yes, they will handle this. By the same token, the OP could purchase any shims he'd need from a driveline shop...
I'm giving him the benefit of the doubt hoping he's not that dumb

An experienced car guy knows what things he should not attempt. Installing gears and painting a car are two that come to mind, especially considering how cheap a gear install is
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Discussing Differential backlash, preload and torque specs. 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)