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a New diff needed for my tr

Discussion in 'Boxers/TR/M' started by zunguri, Nov 7, 2020.

  1. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    Hello

    I’m a new member of this community and need your help on my tr diff problem.

    regarding this kind of matter, I found many topics and comments on the board so i would have a non-ferrari-made diff but there is no information of this kind of diffs in japan.

    does anyone know where to perches a good diff?

    thanks in advance

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    toshi


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  3. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    6,608
    southwest germany
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    romano schwabel
    #2 turbo-joe, Nov 7, 2020
    Last edited: Nov 7, 2020
    sad to read your first post about this broken diff :(
    so one more

    try to get in contact with modena engineering in australia

    is this a "normal" TR or a koenig competition TR? I know that some koenig competition are in japan but not know anybody there. walter koenig told me there are some owners in japan with those competitions and he wanted to give me contact details but before he did so he unfortunatly died
     
  4. eziotestarossa

    eziotestarossa Karting

    Mar 28, 2014
    86
    Florida
    Full Name:
    Ezio
    Hi Toshi!

    So sad, I know how you feel. Luckily it looks like your crown wheel hasn't been affected.

    I sent you a PM!
     
  5. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    thank you for your reply!

    My TR is a “normal” one though wheels, sheets and some parts are modified.

    I haven’t heard about koenig competition TR in japan.
    Genuine Koenig tuned or “koenig look” Mercedes are some time seen.
     
    turbo-joe likes this.
  6. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    i’m novice guy how to see PM?
    i retry on my PC. thank you!


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  8. MOSS

    MOSS Formula 3
    Rossa Subscribed

    Apr 28, 2004
    1,448
    Turbo Joe's recommendation is excellent and Newman who is on this Forum makes another awesome piece !
     
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  9. c4b4the04

    c4b4the04 Karting
    Silver Subscribed

    Jun 9, 2017
    243
    Northern Virginia
    Full Name:
    Cassidy
    Newman's part is stellar. Quality abounds and you know it will fit. There is so little tolerance for error in setting these up, you know this one will work. This was the first differential I have ever set up in my life and we nailed it the first time.
     
    Newman, 2dinos, VColin and 1 other person like this.
  10. Bradwilliams

    Bradwilliams F1 Veteran
    Silver Subscribed

    Welcome to the club man! LOL. Sorry you had to join it but the broken Diff is the true badge of honor for all serious TR enthusiasts! Be sure to report your mileage for our Database.
     
  11. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    Hi guys

    Thank you for welcoming me.

    actually I got in touch with Newman but at that moment he had no stock.

    So now i’m talking with some suppliers I will report when i decide which one i will buy and what will happen.




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  13. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    Hi guys

    I’m now considering whether NOS part No. 155099 or non-ferrari-made diff.

    some say 155099 is better than old diff, some say as bad as old one.

    I’m also talking with Gripper Differential and Modena Engineering.

    how about your opinion? genuine or not?

    toshi


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  14. V4NG0

    V4NG0 Karting
    Silver Subscribed

    Dec 14, 2018
    230
    Looking for parts NLA
    How long does it take to install the new diff once the engine is already out? An extra 5 hours? An extra 25 hours?
     
  15. Drew Altemara

    Drew Altemara Formula 3

    Feb 11, 2002
    1,384
    Tuscaloosa, AL
    Full Name:
    Drew Altemara
    Try T Rutlands as well. If you damaged anything else they can probably sell you a case and new bearings, syncros, etc to help. Just a thought.
     
  16. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    6,608
    southwest germany
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    romano schwabel
    if all the adjustment with the old diff will fit - then yes

    if you have to adjust all then may be not more than 15 h

    you will dismantle the complete gearbox? then you will need more than 25 h
     
    V4NG0 likes this.
  17. EZORED

    EZORED Formula Junior
    Silver Subscribed

    Nov 24, 2007
    649
    Scottsdale, AZ
    Full Name:
    Dennis
    I thought the 155099 is the 512m dif, which was upgraded and much better!!
     
  18. EZORED

    EZORED Formula Junior
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    Nov 24, 2007
    649
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    Dennis
  19. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    https://www.carsensor.net/usedcar/detail/CU9095747884/index.html?STID=SMPH0002&RESTID=SMPH0001&fed=othkakudaikoma_detailb20200519007nu#mainBlock

    i found it.


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  20. EZORED

    EZORED Formula Junior
    Silver Subscribed

    Nov 24, 2007
    649
    Scottsdale, AZ
    Full Name:
    Dennis
    WoW! that thing is over the top, But weirdly, I kinda like it! LOL
     
  21. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    2,876
    Toshi,

    Welcome!

    Best wishes in your search and repair.
     
  22. MOSS

    MOSS Formula 3
    Rossa Subscribed

    Apr 28, 2004
    1,448
    Interesting comment.
     
  23. zunguri

    zunguri Rookie

    Nov 7, 2020
    7
    Full Name:
    toshi
    Hi guys,

    So far my mechanic got all the parts to fix including a good diff.

    BUT he found the diff side support? LH diff cover could not be used because its center hole which shall hold a bearing so tight is too loose. looser than so calls hand fit.

    Both the diff cover and the bearing are Ferrari made genuine parts.
    it’s not a great news, but we are taking a little steps for the goal.

    TOSHI



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  24. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    6,608
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    romano schwabel
    no, normal timken bearing, nothing special
     
  25. versamil

    versamil Formula Junior
    Silver Subscribed

    Apr 28, 2013
    688
    Gaston, Oregon
    Full Name:
    Brian Healy
    While a few people don't believe me, Timken bearings are NOT very accurately sized on the cups. You need to accurately measure the hole in the side cover, and also accurately measure the bearing CUP OD. The difference between a press fit and a sliding fit is only 1 thousanths on an inch. Tolerances for the OD of Bearings are unfortunately more than that.

    As a machine tool builder, I KNOW how much these cups vary in size. Most automotive shops don't have the capability to accurately measure bore size, and compare to the cup. Don't jump to the conclusion that your side cover is the wrong size. I HAVE the Timken bearing engineering book that has the figures for tolerance on size of the cups used in the Testarossa. It's .0015 a SHOCKINGLY huge variance. Buy a couple of more bearing cups, if you can find them cheaply and see if any are tighter.
     
  26. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    6,608
    southwest germany
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    romano schwabel
    I wonder about this size variations. until now all bearings from timken I had have been outside diamater excatly the same to 1/100 mm.
    but those 0.0015 inch are also shocking for me :(
    so until now then I think had always good luck?
    nevertheless I wonder if you would buy such bearing ( at F you only get the complete bearing, so in - and outside ) from ferrari if those also vary so much in outside diameter? if so then no wonder why the diffs often are breaking
     
  27. versamil

    versamil Formula Junior
    Silver Subscribed

    Apr 28, 2013
    688
    Gaston, Oregon
    Full Name:
    Brian Healy
    I did a survey of bearing cups ten years ago, when I noticed variances. I bought Timken brand bearings made in the USA, which frankly are hard to find. Other Timken bearings made in Brazil were also supplied. I also bought Koyo taper roller bearings to compare with. These cups varied in diameter by over a thousanths. The USA made cups- SEEMED to be close to the specified diameter, while the made in Brazil Timken bearings were large. I have a Testarossa side cover and the bearing on my granite surface plate. I'll check and see what measurements they are, and give them in metric and imperial sizes. I'll also locate my Timken bearing engineering handbook, and verify what the tolerance is for these bearings. I was looking at it a few months ago when Jamie was doing his differential.

    All parts have tolerances for size. Whether it's Timken bearings or the Ferrari side covers, if you get unlucky you COULD get a bearing on the small side of the tolerance and the side cover bearing bore on the high side, and have a loose fit. I'm loosely using the Timken brand as the bearing supplied, but it MAY be another brand. The differential I have apart has French manufactured Timken cups. It's nice to have new parts that assemble correctly, but for a small amount, you can coat the cup with a Loctite product called bearing mount.
     
  28. qwazipsycho

    qwazipsycho Formula 3

    Oct 30, 2004
    1,115
    Utah
    Full Name:
    Scott
    Wow, how Ironic. Today is the first time I've logged into Fchat in a long long time. And this is the first post on the TR thread. So sorry to see this happened to you too. Your diff looks EXACTLY like mine did. I'm sure there have been more of these since I logged in last. And I'm sure there are still the nay-sayers who think this isn't a factory flaw.
    Well that was a short and sweet visit. I'll stop back by in a year or so and see how many more there are.
     

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