Another broken Diff | FerrariChat

Another broken Diff

Discussion in 'Boxers/TR/M' started by Newman, Nov 22, 2012.

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  1. Newman

    Newman F1 World Champ
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    #1 Newman, Nov 22, 2012
    Last edited by a moderator: Sep 7, 2017
    I took a diff out of a 90 testarossa box today in hopes of finding the source of a vibration that is at its worst when the fluid is cold. As it warms up it reduces but never goes away. I was going to install one of my billet carriers as part of the service then my eyes popped out. I removed the nuts for the left side cover and the guts fell out of the carrier. The left side support cover is also cracked. What a lucky guy that this thing didnt grenade! I keep carriers in stock for just such an occasion.
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  2. blu328gts

    blu328gts Formula 3
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    Just...WOW! Having one of your billet carriers in my 512TR really provides piece of mind!!!
     
  3. tbakowsky

    tbakowsky F1 World Champ
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    I guess this problem really is just a myth..getting blown out of proportion, rarely happens.

    What is this now..6 or 7 between the 2 of us? with a potential 8th sitting in my shop right now. How many TR's are there in our general area? 25-30? Looks like the odds of failure are climbing fast.

    Makes me wonder how many others are out there, driving around with a cracked diff and the owners don't even know it.

    I'll be buying another carrier from you in summer, going to jam it into a mint low mileage tr as a preventative measure.
     
  4. willrace

    willrace Three Time F1 World Champ
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    SAME HERE ! ! Yours is already in the Boxer's box, for when the drivetrain goes back in. It'll be nice having one less major thing to worry about.

    Then, there's the........ :D
     
  5. 2dinos

    2dinos F1 Rookie

    Jan 13, 2007
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    The support cover? You mean that Al side cover? Do you stock spares of these?

    One more thing to worry about.
     
  6. Newman

    Newman F1 World Champ
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    I dont stock the side cover but I've debated it for a while now. I have a plan though :) Besides the crack the side cover also wears where it locates in the box itself which is evidence it moves around under load.
     
  7. Newman

    Newman F1 World Champ
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    Thanks guys im glad you're happy with the carriers!
     
  8. 2NA

    2NA F1 World Champ
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    Thanks for posting those pictures. I have a client that thinks it's all an internet myth. I've warned him, now I can show him what to expect.
     
  9. Melvok

    Melvok F1 World Champ
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  10. Newman

    Newman F1 World Champ
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    I hear the nay sayers all the time. I had an 88.5 here last week and it has the same cycling vibration just to a lesser extent than the 90 in the pics. Is it the carrier? Probably! He just bought the car last month service done, new tires, nice car but I warned him. Not sure if he's taking it seriously or not.
     
  11. evandaalen

    evandaalen Formula 3
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    #11 evandaalen, Nov 23, 2012
    Last edited by a moderator: Sep 7, 2017
    I recently visited Forza Service, a very good shop here in The Netherlands. They also recently had a TR with a broken diff. I haven't seen the diff myself, but this part was also told to come from that TR. Yikes ...
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  12. 2dinos

    2dinos F1 Rookie

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    Reeeallly ?! I gotta find a way to visualize my diff. Is the whole box flexing? Is it the pinion sideload that is playing in to push components about? (Like the side cover).
     
  13. Melvok

    Melvok F1 World Champ
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    Edvar, it's the pinon, part of the Crown & Pinion wheel (C&P; kroon -en-pionwiel) ....

    Only to be replaced together with the pinionwheel (and diff) ... the crownwheel is mounted on the diff .... When the diff goes, the C&P are gone too ...

    So... one MORE ! Looks like they all will one day ............ :(
     
  14. Newman

    Newman F1 World Champ
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    #14 Newman, Nov 26, 2012
    Last edited by a moderator: Sep 7, 2017
    Some more pics of the crack. Hard to see it and I couldnt determine that it was cracked until the left side support was removed.

    Transfered the OEM internals to the new billet carrier and transferred the crown gears. Checked both gears for flatness and they're both perfect. I did find that the old style bolts were loose - finger tight - on the 90 testarossa crown gear after I folded the lock tabs out of the way. The updated bolts are completely different and wont back off.

    Left one is a 76 BB the right is a 90 Testarossa, both internals were in perfect condition as were the gears.
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  15. Melvok

    Melvok F1 World Champ
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    Amazing, that crack: exactly as with mine.... people don't believe it's cracked untill you remove the part ... (people even want to reweld ...:()

    Photo, one before last Paul: does that Crownwheel on the right looks dented ... ?
     
  16. Newman

    Newman F1 World Champ
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    No its not damaged in any way.

    When I first started making the carriers I had a guy ask me for another welded carrier to replace a welded one that broke! I have a bunch of them now, he was on a tight budget but at the time I didnt have anything but my billet ones so he passed.
     
  17. Spasso

    Spasso F1 World Champ

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    The owner should go buy a lottery ticket while his luck is so good.
     
  18. Melvok

    Melvok F1 World Champ
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    Pure ignorance ... and too little money as reserve .....

    But if a carrier breaks and also the C&P gets damaged ...... the bill rises to extreme hights ...

    So: better invest a bit af money (let's say$ 5000; planned expence) instead of paying a 5 time higher bill unexpected ...

    And allways unexpected .... and of course no money was reserved for that repair ...

    When you do an engine out: exchange the diff is my advise. They will ALL go in short time ... and NEVER replace them with the OEM diff ... this will go again !

    We should be very happy that there are some inventors in Canada and England who now make reliable repalcement differentials !

    In fact they are an UPGRADE !
     
  19. George Vosburgh

    George Vosburgh F1 Rookie
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    Paul, Your carrier looks stronger than the whole unit!
     
  20. Newman

    Newman F1 World Champ
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    Thanks George, theres a bunch of them in twin turbo boxer and Testarossa applications making 1000HP. Theres a few other components in these boxes that will break long before my billet carrier! As attractive as 1000HP is to me I would never suggest that level with one of these gearboxes, 700 is another story :)
     
  21. Gleggy

    Gleggy Formula 3

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    Do you remember how to drive??
     
  22. Newman

    Newman F1 World Champ
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    Mine will need its first service long before yours even has final paint on it! :)
     
  23. MS250

    MS250 Two Time F1 World Champ
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    Wow, just wow !

    How many Kms were on this 1990 Paul ?
     
  24. Newman

    Newman F1 World Champ
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    80,000kms
     
  25. MS250

    MS250 Two Time F1 World Champ
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    So I have 2 yrs ;)

    Nice to see 80,000kms on Testarossa's.
     

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