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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 12-06-2009, 10:58 AM   #1
lkstaack
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Z4 Differential Cover Install (Not DIY)

I just replaced my the differential cover with a cover from a Z4 while I installed a Quaife LSD. This is not a DIY for the procedure. However, I did want to point out two items that are required for a proper install that I didn't know about when I ordered my cover.

The Z4 cover is a direct bolt on for non-M3 E46 differentials. However, you need to purchase two additional items: 1)Loctite 5970 Gasket Maker, and 2)one 60mm diff bolt (M10X60-8.8-ZNS up to 9/03 build or M10X60-10.9ZNS3 from 9/03)

You won't find diff gaskets any more; BMW uses the loctite in lieu of a gasket. The loctite is difficult to find outside of BMW dealerships, but it is out there. BMW charges about $45 a tube. Off the shelf products will not resist gear oil the way the loctite product does; the diff will leak after awhile.

Although you can reuse the bolts from your old diff, the Z4 cover requires one bolt that is longer than the others.
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Old 12-06-2009, 03:27 PM   #2
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what are the advantages of the z4 diff cover?
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Old 12-06-2009, 10:15 PM   #3
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Quote:
Originally Posted by kaotek323i View Post
what are the advantages of the z4 diff cover?


Also ... Can you write a short review on the lsd ? did you feel any improvement?

Thanks for sharing
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Old 12-07-2009, 07:44 PM   #4
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Just so you know, the run of the mill loctite silicone sealant will work for the diff. For example, the ultra-black will be suffice. For any of you old timers, Permatex Aviation form-a-gasket is excellent (Indian Head Shellac works too) is a cheap alternative.

FYI: Red loctite all of the diff cover bolts if you track your car and run solid bushings. This is a great way to reduce your maintenance time between events (I use a bunch of red loctite on my cars).
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Old 11-09-2012, 07:53 PM   #5
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Quote:
Originally Posted by lkstaack View Post
I just replaced my the differential cover with a cover from a Z4 while I installed a Quaife LSD. This is not a DIY for the procedure. However, I did want to point out two items that are required for a proper install that I didn't know about when I ordered my cover.

The Z4 cover is a direct bolt on for non-M3 E46 differentials. However, you need to purchase two additional items: 1)Loctite 5970 Gasket Maker, and 2)one 60mm diff bolt (M10X60-8.8-ZNS up to 9/03 build or M10X60-10.9ZNS3 from 9/03)
Thread resurrection here, but I've just purchased a LSD an awaiting it arrival. I plan on installing the Z4 finned diff cover, my car is a pre 03 model so i will be buying the M10x60-8.8-ZNS version of the long bolt. However for the remaining 7 bolts will i need my E46 bolts or the equivalent Z4 bolts for models up to 09/2003?

For those interested and wondering why install the z4 cover, the fins help keep the diff oil cooler and thus better protection for the diff itself. E46's didnt have diff fins.
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Old 11-09-2012, 08:48 PM   #6
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i used autozone permatex. 5 months later and zero leaks. i also used a oem gasket that i was able to find from a member on here so i used both

i have non lsd 3.46 with finned diff cover. it look awesome under there
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Old 12-27-2012, 09:49 PM   #7
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Looks like this stuff could be safely used as an alternative to the pricey loctite 5970 stuff:

http://www.permatex.com/products/pro...t-maker-detail

Permatex part number 81182
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Old 12-29-2012, 07:10 AM   #8
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Also the BMW part number for the longer bolt is 07119905148
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Old 01-02-2013, 10:09 PM   #9
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Quote:
Originally Posted by kaotek323i View Post
what are the advantages of the z4 diff cover?
It finned so it keep oil cooler
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Old 01-03-2013, 01:22 PM   #10
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Quote:
Originally Posted by kaotek323i View Post
what are the advantages of the z4 diff cover?
The E46 Motorsports Finned cover is avail as a BMW Motorsports part; slightly different casting than the Z4 unit. Same effect also and avail brand new from BMW

The Higher capacity of oil compared to standard cover is nice for thermal stress as well; the cover is also heavier and stiffer/stronger (more metal)






BMW Motorsports cover (NEW):



Z4 finned cover (used)



Casting difference at bolt mounting: the required length of bolts are different!

BMW Motorsports cover

Z4 finned cover
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LSD dreamers thread

http://forum.e46fanatics.com/showthread.php?p=14989087
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http://forums.bimmerforums.com/forum....php?t=1437471

Last edited by wanganstyle; 01-03-2013 at 01:23 PM.
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Old 06-08-2014, 09:21 AM   #11
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Quote:
Originally Posted by wanganstyle View Post
The E46 Motorsports Finned cover is avail as a BMW Motorsports part; slightly different casting than the Z4 unit. Same effect also and avail brand new from BMW

The Higher capacity of oil compared to standard cover is nice for thermal stress as well; the cover is also heavier and stiffer/stronger (more metal)






BMW Motorsports cover (NEW):



Z4 finned cover (used)



Casting difference at bolt mounting: the required length of bolts are different!

BMW Motorsports cover

Z4 finned cover
Happen to have part numbers or from which model to get the bolts from?
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Old 06-19-2014, 10:46 AM   #12
wanganstyle
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Originally Posted by paraklas View Post
Happen to have part numbers or from which model to get the bolts from?
The BMW motorsports cover (for non-M e46) does not come on any models from the factory; the BMW motorsports car that was shipped from the factory in E46 era is named "M3"

the Z4 rear cover comes from a .......... what model car?
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WSG Billet CNC LSD production Development
http://forums.bimmerforums.com/forum...pdate-backdate
S54B32+E36 1997 M3 Sedan+DTA S100 alpha N
http://forums.bimmerforums.com/forum....php?t=1437471

Last edited by wanganstyle; 06-19-2014 at 10:47 AM.
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Old 07-01-2014, 07:13 AM   #13
Mafik
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p/n for this cover 33117512980.
It's just finned transmission cover, in case of BMW e46 - only for e46 330(i/Ci/Ci Convertible) for USA with Performance package. Actualy it's a first time when I see "BMW Motorsport" for this cover.
But, in case of e46, this cover fit fine to any TYP 188K differentials
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