Will Quaife fit in 02 Open Diff Case?

[Lengrep]

I think I've located a set of used but usable 3.36 gears for my Turbo, but now face the challenge of building an LSD that looks right.  So I don't want to use an E21 LSD if possible. 

 

It's my understanding (perhaps wrong) that I can't use E21 LSD guts in an 02 open diff case.  So I'm wondering if the Quaife unit will fit in an open diff case.  I have a spec sheet from them with the dimensions, but have now way of knowing if it's a fit or not.  It's attached to this post.

 

Anyone out there know the answer?

 

Thanks!

[Mike Self]

1 hour ago, Lengrep said:

It's my understanding (perhaps wrong) that I can't use E21 LSD guts in an 02 open diff case. 

I'm no expert on this, but I do have an E21 3.64 LSD in my garage, which externally looks very much like the seized 2002 diff sitting next to it.  Other than the E21 diff being a bit narrower and having a different rear cover, they look like at least cousins, so shouldn't deviate too much visually if installed on a 2002.  And there are any number of ways to make 2002 half shafts work with an E-21 diff.  

 

mike

[AceAndrew]

No it will not fit in a 2002 case, dimension L3 is the issue.  No you cannot use the E21 LSD guts in a 2002 open case diff, BUT you can use an E30 or E36 168mm LSD in a 2002 open case housing (but you will also need to source a pair of E21 flanges).

 

And congrats on sourcing 3.36 gears, those are tricky.

Edited December 20, 2017 by AceAndrew

[Lengrep]

No it will not fit in a 2002 case, dimension L3 is the issue.  No you cannot use the E21 LSD guts in a 2002 open case diff, BUT you can use an E30 or E36 168mm LSD in a 2002 open case housing (but you will also need to source a pair of E21 flanges).
 
And congrats on sourcing 3.36 gears, those are tricky.

Thanks!


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[halboyles]

1 hour ago, AceAndrew said:

BUT you can use an E30 or E36 168mm LSD in a 2002 open case

Does the QDF6N then work in the '02 case?

QDF6N.pdf

 

Edited December 20, 2017 by halboyles
dup

[Preyupy]

The QUA-ATBD-4N Quaife unit will fit in the 2002 housing but you must use the #33 11 1 200 682 side bearing housings (still available from BMW, $$$$). You will also need to modify the output shafts by machining a retaining clip grove and plugging the center bolt hole because the Quaife unit does not use the center bolt to hold the shaft into the differential unit.  If you can find a set of the really late 2002 output flanges that used the internal clip to hold them in it makes it a bit easier. 

[AceAndrew]

5 hours ago, halboyles said:

Does the QDF6N then work in the '02 case?

QDF6N.pdf

 

 

That might just work!  It depends on being able to temporarily remove the cap the same way you would with the 318 pumpkins, but the odds would be in your favor (dimensions are right).  Again, you'd want E21 flanges though.

 

As for Byron's solution, didn't even think of using those thicker side covers.  That's a neat trick too.

[Preyupy]

I don't think you can install the QDF6N with the bearings installed into the 2002 case.  The dimensions are about right but if you have taken the Open diff out of the case you know that you have to rotate the carrier so that it can be pulled out by pulling the crown gear up first and rotating the entire unit out.  With the fully round housing of the limited slip (and the Quaife unit) you can't rotate it out that way, it has to be pulled straight out.  That is why the factory limited slip is made with the bearings closer together than the open diff so they will clear the housing (this is why the factory used a different side bearing housing that moved the outer race further inboard)  

[halboyles]

27 minutes ago, AceAndrew said:

That might just work!

 

7 minutes ago, Preyupy said:

I don't think you can install the QDF6N with the bearings installed into the 2002 case.

 

Challenge accepted!  No, seriously, I have no experience with installing the Quaife units having only rebuilt the OEM LSDs for the e10s.  And I sincerely appreciate the decades of experience of both Andrew and Bryon.

 

But "I love a good scrap" (see minute 6 in the video) and, through a series of trades, I do have both Quaife units in hand.  So I am very interested in trying to make this work.  I might have a chance to try the fittings over the holidays and will report back.

 

 

[Lengrep]

 
Challenge accepted!  No, seriously, I have no experience with installing the Quaife units having only rebuilt the OEM LSDs for the e10s.  And I sincerely appreciate the decades of experience of both Andrew and Bryon.
 
But "I love a good scrap" (see minute 6 in the video) and, through a series of trades, I do have both Quaife units in hand.  So I am very interested in trying to make this work.  I might have a chance to try the fittings over the holidays and will report back.
 
 

Standing by!


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[Preyupy]

I just did 2 diffs with the 4N and if the Quaife had been .005” wider it would not have gone into the case. According to the spec sheet the 6N is 15mm wider than the 4N. I’ll be interested to see if you can actually get it IN the case. If you can you might be able to use the standard open diff side bearing carriers. 

[Lengrep]

10 hours ago, Preyupy said:

I just did 2 diffs with the 4N and if the Quaife had been .005” wider it would not have gone into the case. According to the spec sheet the 6N is 15mm wider than the 4N. I’ll be interested to see if you can actually get it IN the case. If you can you might be able to use the standard open diff side bearing carriers. 

You built them in E21 open diff cases?

[halboyles]

10 hours ago, Preyupy said:

I’ll be interested to see if you can actually get it IN the case

 

Thank you for the insights on the 4n unit.  I'll just work with the 6n version then to test fit.  

[Preyupy]

No, I used 2002 diff housings.

[tomorrowcalling]

If it helps anyone, here's a drawing of the side flange required to put a LSD into a open diff housing.  In my case I had an open E21 diff and a LSD center.  After pricing up the side flanges from BMW I had them machined up by a local machine shop for a fraction of the price

VER-DIFF-1 Rev 2.pdf