TR rear bonnet cable broken | FerrariChat

TR rear bonnet cable broken

Discussion in 'Boxers/TR/M' started by UpNorth, Nov 20, 2012.

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  1. UpNorth

    UpNorth Formula 3
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    Sep 30, 2006
    1,767
    Quebec, Canada
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    Francois
    My TR is an early model. These didn't come with the emergency cable...And last week end as I was trying to open the rear bonnet the cable let go inside the cockpit. Cable is unattainable inside its own sleeve.
    Does anybody know how to open the back bonnet without cable?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    You need a steel rod (or screwdriver) about 15~16" long and 3/16" diameter. By poking it thru the rear metal screen inboard of the RH taillight assembly you should be able to push on the lever (that the cable pulls on) to release the latches. I don't have time now, but will post a jpeg this PM (if anyone already has such a photo, please post now).
     
  3. Newman

    Newman F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 26, 2001
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    You have zero luck with cables.
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    Here are some jpegs showing my suggestion. If you use a handled screwdriver to make the tool, the shank length will need to be at least 13" long; if you use a bare 3/16" metal rod, you'll probably need it to be at least 16" long to have enough to hang on to and push. Grind a ~90 deg notch into the end of the tool as shown in this jpeg:

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    These jpegs show my mock-up using a 3/16" hardwood dowel, but you'll need to use a metal tool as the force required to move the lever is not small. Give a shout if you have any questions, and please report the results.

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  5. UpNorth

    UpNorth Formula 3
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    Sep 30, 2006
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    Steve,
    I'm speechless...Just speechless............................
    Thanks!!!
    It'll take some days before I can tackle this job but I will report back you can count on that.
     
  6. vincep99

    vincep99 Formula 3
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    Jun 8, 2009
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    Steve,
    you are amazing...........
     
  7. 302Tim

    302Tim Formula 3

    Jul 2, 2011
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    Use care not to put pressure on that top inboard taillamp white housing....
     
  8. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Thanks for the kind words Gents -- but we'll see how well it works ;)

    Not sure that a long-armed tech couldn't just reach up from below past the end of the muffler if the car was up on a lift. Obviously, F didn't initially think it was an issue because they did have an emergency cable for the front bonnet on the early cars.
     
  9. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
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    romano schwabel
    strange!

    mine is a 87 and has for the rear and for the front an emergency cable to open.
    so may be the ones from 84 or 85 has none?

    but this steve told and showed in the pics will work fine.
     
  10. Melvok

    Melvok F1 World Champ
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    Have someone make pics when you open her please !!!
     
  11. UpNorth

    UpNorth Formula 3
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    Sep 30, 2006
    1,767
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    Yes mine is 85 with vin # 56377.
     
  12. UpNorth

    UpNorth Formula 3
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    #12 UpNorth, Nov 24, 2012
    Last edited by a moderator: Sep 7, 2017
  13. UpNorth

    UpNorth Formula 3
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    #13 UpNorth, Nov 24, 2012
    Last edited by a moderator: Sep 7, 2017
    Third pic you can see the position of the rod on the right side. With a flashlight you can see how to position your rod on the lever. I tried numerous position before finding the right one to push in the best way on the lever.
    Fourth pic shows that you must repeat the same on the left side.
    On both side just push gently but firmly on the lever while you use your other hand to lift gently the bonnet. Easy does it!
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  14. UpNorth

    UpNorth Formula 3
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    #14 UpNorth, Nov 24, 2012
    Last edited by a moderator: Sep 7, 2017
  15. UpNorth

    UpNorth Formula 3
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    #15 UpNorth, Nov 24, 2012
    Last edited by a moderator: Sep 7, 2017
    Then I proceded to change the cable. I used a 3 meter long derailleur cable for a tandem bike! Coated with teflon. The brake cable was too big in my opinion. On the pic you can see the old and new cable. The old cable is actually 90 inches long so a 3 meter long one give ample space to work.
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  16. UpNorth

    UpNorth Formula 3
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    #16 UpNorth, Nov 24, 2012
    Last edited by a moderator: Sep 7, 2017
    I crimped the cable to a lug and made the cable go up to where the nut is in order to attached the end of the cable to it in order to make it solid enough to sustain the pressure induced by pulling on the lever. Just crimping the lug was not sufficient, the cable had to be attached also by the nut. The former lug used by Ferrari was unusable in my case.
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  17. UpNorth

    UpNorth Formula 3
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    #17 UpNorth, Nov 24, 2012
    Last edited by a moderator: Sep 7, 2017
    Finally, since this is an early TR and all of this happened because I did not have an emergency cable I improvised one. Simply attached a cable to the left lever, made it go around the round steel transversal arm and attach it discreetly to the rear grill, voila!
    Could be a little more elegant but I welcome recommandations from you guys.
    Thanks for reading.
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  18. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Glad that you got is sorted/opened.

    Interesting to note the other small design differences between the early and late mechanisms -- e.g., the plastic pivot bushings for the shaft running between the two sides on your early TR vs the plain metal U-bracket with holes acting as the bushing on the late TR...
     
  19. UpNorth

    UpNorth Formula 3
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    Yup, there must be a good reason to scrap a mold and use a piece of metal instead. Money down the drain by scraping the mold and then more money per parts for the metal one. Either problems with plastic part or...italian mistic...!?
     
  20. UpNorth

    UpNorth Formula 3
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    OMG! Steeve's car is dripping oil on the floor...He is human! :D
     
  21. UpNorth

    UpNorth Formula 3
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    OMG! Steeve's car is dripping oil on the floor...He is human! :D
     
  22. sparta49

    sparta49 F1 Veteran
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    Mar 3, 2001
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    No he isn't he put the oil drops down on purpose to make us feel better :)
     
  23. 302Tim

    302Tim Formula 3

    Jul 2, 2011
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    We'll have to search harder for evidence, clearly that cardboard was soiled before it was put under the car, nothing to leak in that corner...

    That said there is quite a lot of dust buildup in that engine bay... :D
     
  24. qwazipsycho

    qwazipsycho Formula 3

    Oct 30, 2004
    1,176
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    I'm bringing this thread back to life because I have broken two of those stupid release cables. Currently I only use the backup cable. I'm sure it will break soon too. I've got to get that fixed. But first.....build the gearbox, attach it to the engine, put it all back in the subframe and reinstall in the car.

    Kinda makes the cable look like not a big deal. But jeeez, that cable broke the first time within 2 months of ownership. The second cable broke within 3 years of replacement. Why are these things so junky??!
     
  25. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
    25,125
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    Steve Magnusson
    Did yours break at the handle end (where the braided cable goes into the metal loop fitting)? The designer of the handle somewhat messed up -- the cable lines up perfectly with the exit hole when the handle is in the down position, but, when you raise the handle, it puts a huge bending moment on the cable-to-fitting joint. If so, a couple of things to try are:

    1. instead of just fully tightening the screw holding the loop fitting, leave it a little loose (and secure the threads with something like Loctite 222), and chamfer both sides of the hole in the fitting so it can sort of move like a Heim (spherical rod end) joint,

    2. Don't just yank up maximum on the handle to where it stops -- only raise the handle enough to release the latch mechanism.

    Just some ideas...
     

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