Countach #12562 re-paint and refresh thread | Page 11 | FerrariChat
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Countach #12562 re-paint and refresh thread

Discussion in 'LamborghiniChat.com' started by Michael Call, Dec 18, 2013.

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  1. Michael Call

    Michael Call Formula 3
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    #251 Michael Call, Nov 12, 2014
    Last edited: Nov 12, 2014
    The second gear synchro was a little wolley from the day that I received the car. You could drive around it, but when the worrysome gear noise manifested itself, a gearbox overhaul seemed a no brainer; as it seemed genuinely broken. The gearbox overhaul revealed no damage to the robust gear set, but was a good opportunity to re-check all shims, refresh old bearings, and install new synchromesh to give the car the most satisfying shift possible.
    The loose ring nut that secures the pinion gear was a real surprise, as it is an exceedingly unusual failure. Again, we were very meticulous in EVERY aspect of the repair procedure to be sure that we never have to do that job (at least on 12562) again.
     
  2. gurslo

    gurslo Formula 3

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    #252 gurslo, Nov 13, 2014
    Ouch! Sorry you went through that after the fact. You must gone from a bliss moment to hearing that gut wrenching gear noise and collapsing onto the steering wheel.:(

    By any chance did you create a photo diary for this task/ procedure?
     
  3. joe sackey

    joe sackey Five Time F1 World Champ

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    #253 joe sackey, Nov 13, 2014
    It was a little woolly 20 years ago!

    Good to see you are getting it sorted.
     
  4. Michael Call

    Michael Call Formula 3
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    #254 Michael Call, Nov 13, 2014
    Last edited by a moderator: Sep 7, 2017
    Unfortunately it is not possible to access the ring nut that secures the pinion gear through the rear differential cover, as the ring nut is on the other side of the cavity the houses the ring and pinion.
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  5. Michael Call

    Michael Call Formula 3
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    #255 Michael Call, Nov 13, 2014
    Last edited by a moderator: Sep 7, 2017
    Yes, it was a gut wrenching moment for sure. I didn't actually flip out or anything, but on the inside I was screaming like that idiot kid who's dad ran over their video games with the lawnmower on YouTube :-(

    On the left is a pic of the torqued, locktited, and staked pinion gear ring nut:

    To the right is a pic of the top side of the sump that provides access to the ringnut that secures the pinion and houses the driveshaft that transmits power from the gearbox back to the differential:
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  6. Michael Call

    Michael Call Formula 3
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    #256 Michael Call, Nov 13, 2014
    Yes, I an certain that this car will be much more sorted than it was when it left the factory thirty years ago :)
     
  7. PineChris

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    #257 PineChris, Nov 13, 2014
    Good job keeping your cool. The car will be amazing when complete.
     
  8. jollygood

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    #258 jollygood, Nov 13, 2014

    Thanks for posting pictures and info. Those diff pics are really interesting.
    Sorry to learn that you had to remove engine twice.

    Do you have any idea why the ring nut came loose?
    How loose was it?
    Bad workmanship at the factory perhaps?
     
  9. PineChris

    PineChris Formula 3

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    #259 PineChris, Nov 13, 2014
    Dont all Countach transmissions whine? How did this noise differ?
     
  10. Michael Call

    Michael Call Formula 3
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    #260 Michael Call, Nov 14, 2014
    Countach gearboxes are rather noisy simply due to the fact that the gearbox sits right next to you. On acceleration it sounded normal, on deceleration (when the pinion gear was not under load to maintain normal lash with the ring gear) it became quite loud (probably 3X louder than normal) I only drove it two blocks like this before I stopped out of mechanical sympathy. I suspect that if I had kept going it would have gotten much worse. It probably would have sounded like a "jake brake" on an 18 wheeler within a few miles.
     
  11. Michael Call

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    #261 Michael Call, Nov 14, 2014
    The ringnut at worked itself loose nearly to end end of the thread. This allowed the pinion gear to walk up to 5mm when it wasn't under load. The ringnut for the pinion gear had been staked at the factory, but I suspect that it wasn't torqued all the way to spec. Also remember that this car was made before the days of locktite...
     
  12. jollygood

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    #262 jollygood, Nov 14, 2014


    They don't whine that much if transmission is in perfect condition.
    But correct, the Countach transmission gears are straight cut and thus make "some" noise compared to a regular car.
    If you have driven a good Countach you will recognize it when you drive one with a bad trans.
     
  13. garybobileff

    garybobileff Formula 3
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    #263 garybobileff, Nov 15, 2014
    The gears in a Countach transmission are NOT straight cut, but are helical.
    Gary Bobileff
     
  14. Michael Call

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    #264 Michael Call, Nov 15, 2014
    Last edited by a moderator: Sep 7, 2017
    Originally Posted by jollygood:
    They don't whine that much if transmission is in perfect condition.
    But correct, the Countach transmission gears are straight cut and thus make "some" noise compared to a regular car.
    If you have driven a good Countach you will recognize it when you drive one with a bad trans.

    Originally Posted by Gary Bobileff:
    The gears in a Countach transmission are NOT straight cut, but are helical.
    Gary Bobileff

    Gary is absolutely correct. The Countach gear set is helical in it's cut. Any perceived "noisiness" of the gearbox has to do with it's unconventional placement so close to the occupants of the car. Here is a photo of the gear set from #12562 when I had the gearbox at Gary's shop for overhaul:
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  15. jollygood

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    #265 jollygood, Nov 15, 2014

    Well, you learn something new every day. Thanks for adding the correct info and pictures.
    I have had the opposite and obviously wrong impression for many years. My bad.
     
  16. raymondQV

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    #266 raymondQV, Nov 15, 2014
  17. Pantera1889

    Pantera1889 Formula Junior

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    #267 Pantera1889, Nov 16, 2014

    How is the placement of the trans ,in relation to the occupants, so different than 90% of
    all front engine cars?



    Ron
     
  18. blown daytona

    blown daytona Formula 3

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    #268 blown daytona, Nov 16, 2014
    probably the lack of insulation in a Countach, adds to the trans noise
     
  19. raymondQV

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    #269 raymondQV, Nov 16, 2014
    You can put a towel onto the gear gate and suddenly 80% of the noise is gone...
     
  20. joe sackey

    joe sackey Five Time F1 World Champ

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    #270 joe sackey, Nov 16, 2014
    Funny you mentioned this, because on that long road trip from Lucerne to St Moritz in the DD QV, that's exactly what my wife did, and the 'dentist drill' noise was considerably muffled. The only sound-deadening between the cabin and the whirring gear-sound is that flimsy rubber boot, and in most cases that's cracked or displaced.

    My experience with Countachs is that (aside from an obviously worn 'box) the gear noise is a fairly random thing from car-to-car.

    I guess I could say Countach 'boxes are like people. Some are fairly quiet, some whine a little, and some whine a lot!!
     
  21. Maser

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    #271 Maser, Nov 16, 2014
    Ha!

    I have a cloth at the ready under the passenger seat, to wind round the gearstick whenever I'm doing long journeys in the Countach. And I thought it was just me!
     
  22. Anderson

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    #272 Anderson, Nov 16, 2014
    I drove my LP400S from Ft. Collins to Billings for the rally honoring 50 years of Lamborghinis (1,400 mile trip). The roads north of Cheyenne to Billings were near perfect but highly populated with cops. The car would run for an hour or two and then start with the "dentist drill" whine at certain rpms. I thought it was a great sound and loved the way it changed with differing revs. 10-20 mins of this and the sound stopped, leaving only all the other sources of sound (the carbs, the exhaust, timing chains, road noise, etc.). I loved the sound as the car screamed along.

    Anderson
    Colorado
     
  23. Pantera1889

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    #273 Pantera1889, Nov 16, 2014
    So there are TWO LP400s in Ft. Collins?????

    Ron
     
  24. Taurean Bull

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    #274 Taurean Bull, Nov 17, 2014
    Oh Ron.... ;)
     
  25. vaholtorf

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    #275 vaholtorf, Nov 17, 2014
    Hi Ron,


    There are actually at least 6 Countachs in Fort Collins! 6/100,000 = largest percentage ???? I think there are more Countachs here than Panteras!!
    I don't know about the Chevelle LS6 to Stage 1 ratio though...
     
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