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Thread: SHouldn't both rear wheels spin when an LSD is installed...?

  1. #1
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    SHouldn't both rear wheels spin when an LSD is installed...?

    Guys,

    Am I missing something (like a working LSD)?

    Last edited by shaytanabyad; 01-30-2014 at 04:40 PM.
    1995 540 M-Sport Cosmos Schwarz on Parchment w/ (Open) 3.15 LSD - http://forums.bimmerforums.com/forum....php?t=1805972

    Current Status : I SOLD HATE MEH... LOVE my car.


  2. #2
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    stock is only 25% lock up, so not necessarily all of the time. but looking at the video, i'd expect you to get some motivation from the right rear. Probably worn out.
    Last edited by mottati; 01-30-2014 at 04:59 PM.
    Mike
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  3. #3
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    fried clutch pack

  4. #4
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    Have you had both rear wheels off the ground and rotated one wheel with the e brake off in neutral?

    If both wheels rotate the same direction you have a limited slip differential.

    If the wheels rotate opposite of one another you have a open differential.

    If you don't know what I am talking about ask whoever installed the "3.15"

  5. #5
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    Sorry. I should have given some backstory... My brother and I installed the diff and it had the coveted "S" on it...


    The donor car never ran so it wasn't pre-tested. Would a "fried clutch pack" essentially turn an LSD into an open diff? Any way to check w/out taking everything out?
    Last edited by shaytanabyad; 01-31-2014 at 12:59 PM.
    1995 540 M-Sport Cosmos Schwarz on Parchment w/ (Open) 3.15 LSD - http://forums.bimmerforums.com/forum....php?t=1805972

    Current Status : I SOLD HATE MEH... LOVE my car.


  6. #6
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  7. #7
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    Quote Originally Posted by shaytanabyad View Post
    Would a "fried clutch pack" essentially turn an LSD into an open diff? Any way to check w/out tacking everything out?
    Have someone slowly turn a wheel in one direction. If you can freely turn the other wheel in the other direction without any resistance the clutch is gone. On a bad diff, I could easily turn the output flanges in opposite directions by hand. On a good diff, I could not. There are write-ups on changing the clutches. It doesn't look too complicated.
    demet

  8. #8
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    Seems like fried clutches from the whine.

    Also lol at 'stupidest thing ive done'

  9. #9
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    Quote Originally Posted by Hofmeister View Post
    Seems like fried clutches from the whine.

    Also lol at 'stupidest thing ive done'
    Fried clutches won't whine, they just don't grip. Whining is bearing noise.

  10. #10
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  11. #11
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    Quote Originally Posted by Binjammin View Post
    Whining is bearing noise.
    Which bearings, where?

    From what I'm hearing, I think, moving forward, assuming a fried clutch pack is the thing to do.

    Thank you for all the help.
    1995 540 M-Sport Cosmos Schwarz on Parchment w/ (Open) 3.15 LSD - http://forums.bimmerforums.com/forum....php?t=1805972

    Current Status : I SOLD HATE MEH... LOVE my car.


  12. #12
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    Quote Originally Posted by shaytanabyad View Post
    Which bearings, where?

    From what I'm hearing, I think, moving forward, assuming a fried clutch pack is the thing to do.

    Thank you for all the help.
    Didn't watch the video, but if someone was hearing a whining noise, that's what my post was referring to.

  13. #13
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    Looks like it could be a broken pinion gear, but I'm no expert. Have you tried to spin them on dry? If its a healthy LSD it should be able to do this.
    they expected to see a mustang or a muscle car and then its like WTF? a BMW?

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    Quote Originally Posted by shaytanabyad View Post
    Would a "fried clutch pack" essentially turn an LSD into an open diff? Any way to check w/out tacking everything out?
    Yep. So it's just all tired and worn out. Aside from having to remove the diff to do it, the rebuild isn't too bad. Plus, if you want to, you can upgrade the clutch pack to 40% lockup. Jon (5nail5) has info in one of his threads.

    Fox

    - - - Updated - - -

    Quote Originally Posted by slippyM395 View Post
    Looks like it could be a broken pinion gear, but I'm no expert.
    Uh, on this one I think not. Generally a broken pinion would make the car not move - the pinion is the input point for power. So I highly doubt it's that (like 99.9995% sure). I'm about that sure it's the clutch pack - the 'whining' that someone mentioned could easily be the clutches slipping and chattering at a high pitch.

    OP - do you know how many miles the car the S3.15 came out of had? Still going to end up needing a rebuild, but I'm just curious.


  15. #15
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    Not sure how many miles in the donor car but I look through my records and can try to find out. Anyone have a good source for new clutch packs? I'm not sure if I need 40% but will look into it more.

    Found this...

    http://www.bimmerdiffs.com/products/...-kit-25-lockup

    Thoughts? 2-clutch set gives 25% lock-up and there's a 3-clutch option, which requires some machining, that gives 40% lock-up. I think 25% will be just fine for me.

    Also, check out Jon K's AWESOME video here...

    http://www.bimmerdiffs.com/pages/guides-videos
    Last edited by shaytanabyad; 01-31-2014 at 10:43 AM.
    1995 540 M-Sport Cosmos Schwarz on Parchment w/ (Open) 3.15 LSD - http://forums.bimmerforums.com/forum....php?t=1805972

    Current Status : I SOLD HATE MEH... LOVE my car.


  16. #16
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    Jon posted some videos on youtube doing this.

  17. #17
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    Quote Originally Posted by ShapeShifter View Post
    Jon posted some videos on youtube doing this.
    Pat - Thanks. I posted a link to one of them above...ha.
    1995 540 M-Sport Cosmos Schwarz on Parchment w/ (Open) 3.15 LSD - http://forums.bimmerforums.com/forum....php?t=1805972

    Current Status : I SOLD HATE MEH... LOVE my car.


  18. #18
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    Quote Originally Posted by shaytanabyad View Post
    Not sure how many miles in the donor car but I look through my records and can try to find out. Anyone have a good source for new clutch packs? I'm not sure if I need 40% but will look into it more.

    Found this...

    http://www.bimmerdiffs.com/products/...-kit-25-lockup

    Thoughts? 2-clutch set gives 25% lock-up and there's a 3-clutch option, which requires some machining, that gives 40% lock-up. I think 25% will be just fine for me.

    Also, check out Jon K's AWESOME video here...

    http://www.bimmerdiffs.com/pages/guides-videos
    IF you've already got to rebuild it, why not 'do it right'? The 40% option doesn't really have any drawbacks, so why not? I'll be going that exact route when I get a 3.15 myself (hopefully sometime this spring). My $.02

    Fox


  19. #19
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    Fox there's a 3.15 for sale in the classifieds.
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  20. #20
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    Quote Originally Posted by K Fox View Post
    ... why not 'do it right'?
    Honestly, it's a bit scary (to me) because of the machining required. Plus it's a bit more expensive... But I might...ha.
    Last edited by shaytanabyad; 01-31-2014 at 07:29 PM.
    1995 540 M-Sport Cosmos Schwarz on Parchment w/ (Open) 3.15 LSD - http://forums.bimmerforums.com/forum....php?t=1805972

    Current Status : I SOLD HATE MEH... LOVE my car.


  21. #21
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    Does the s on the case itself mean lsd or is it only a s on the tag?

    I seem to remember my 3.15 lsd having a s on the case, but I don't remember the stocker.


  22. #22
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    Check this out:
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  23. #23
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    Quote Originally Posted by me78569 View Post
    Does the s on the case itself mean lsd or is it only a s on the tag?

    I seem to remember my 3.15 lsd having a s on the case, but I don't remember the stocker.
    Both mean that. My current lsd had 2 S's on the case.

  24. #24
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    thanks for the insight


  25. #25
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    Quote Originally Posted by me78569 View Post
    thanks for the insight
    Lsd cases are also painted black.

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