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sheared bolt head in Testarossa gearbox

Discussion in 'Boxers/TR/M' started by shaikhzeep_212, Jun 11, 2011.

  1. shaikhzeep_212

    shaikhzeep_212 Karting

    Apr 13, 2006
    85
    Saudi arabia
    Full Name:
    HAM
    Good day gentelmen,

    When removed the gear box oil drain magnet plus found stick to it a sheared bolt head!!!! and swarf metal swarf.

    Can any one tell me where the bolt head came from and even tough the gear box runing smooth!!!!

    Thanks
     
  2. PAP 348

    PAP 348 Moderator
    Moderator Owner

    Dec 10, 2005
    85,851
    Mount Isa, Australia
    Full Name:
    Pap
  3. testamon

    testamon Formula Junior

    Aug 16, 2008
    346
    Sydney
    Full Name:
    Mike O
    If it came out from the rear drain plug can just about garantee that it is a crown wheel securing bolt. I can't remember if you can see these side on through the drain hole as you turn the diff if not see if you can borrow a boroscope and check all the bolt heads are there. If it is the bolts you can leave the engine in the car and remove the bellhousing and the rear transaxle cover. Once the rear cover is removed you can jack the rear of the engine up to enable removal of the complete diff assembly. It is difficult to get past that thin frame assembly, but possible. Do a search there are cases of these bolts shearing and also info on replacements and various changes through the TR years. Good luck.
     
  4. Hawaii

    Hawaii Formula Junior

    Jan 28, 2007
    847
    Maui
    Full Name:
    Emery
    What year is your TR?
     
  5. shaikhzeep_212

    shaikhzeep_212 Karting

    Apr 13, 2006
    85
    Saudi arabia
    Full Name:
    HAM
    Hawai, 1991.I am going to open the gearbox soon and i will show some pictures.
     
  6. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    6,019
    southwest germany
    Full Name:
    romano schwabel
    could you post a picture of this sheared bolt head please? or this what you have
     
  7. Newman

    Newman F1 World Champ
    Professional Ferrari Technician Owner Consultant

    Dec 26, 2001
    13,471
    Canada
    Full Name:
    Newman
    Crown gear bolt is my bet, seen it before! Please post a pic.
     
  8. Melvok

    Melvok F1 World Champ
    Silver Subscribed Owner

    Jul 25, 2008
    12,977
    Amersfoort, Holland.
    Full Name:
    Mel
    Hi Hosam, did you read this thread ?

    Then you know you may be in BIG **** .... (hope not but .......) ...

    Please show / tell us more ...
     
  9. shaikhzeep_212

    shaikhzeep_212 Karting

    Apr 13, 2006
    85
    Saudi arabia
    Full Name:
    HAM
    Hi Melvok,

    Next week i am going to take the Testa to workshop of mine and i am going to drop the engine for full service.

    It is good time to open the gear box and check it.

    I am not worried too much about the gear box because run smooth and shift right but this bolt head annoying me.

    We will open the chocolate box and see what inside .

    I will update with photos.

    Thanks
     
  10. Melvok

    Melvok F1 World Champ
    Silver Subscribed Owner

    Jul 25, 2008
    12,977
    Amersfoort, Holland.
    Full Name:
    Mel
    Good idea !! Good Luck Hossam ... :D
     
  11. vincenzo

    vincenzo F1 Rookie

    Nov 2, 2003
    2,737
    Is a broken crown bolt an early indicator of diff failure?

    I could imagine diff vibration pushing the bolt to failure.... or vice versa.

    It will be very interesting to learn of the condition of this diff. Hopefully you'll magnaflux the diff while it is in-hand.

    Rgds,
    Vincenzo
     

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