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Campagnolo Gran Sport Rear Derailleur

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Campagnolo Gran Sport Rear Derailleur

Old 05-02-20, 07:32 PM
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SB_Greg 
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Campagnolo Gran Sport Rear Derailleur

Im cleaning up a Campy Gran Sport rear derailleur froma 1960 Carolton Franco Suisse. I have it all dissasembled except for the bolt holding the rear assembly together. See my photos. Should the bolt with my allen wrench inserted simply unscrew? Ive had it soaking in solvent and it wont budge. I am afraid to apply much more pressure until I know what is what.


Here is where I am at. This bolt wont budge!

Photo of the back.

before dissasembly

Last edited by SB_Greg; 05-02-20 at 07:56 PM.
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Old 05-02-20, 08:10 PM
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Originally Posted by SB_Greg View Post
Im cleaning up a Campy Gran Sport rear derailleur froma 1960 Carolton Franco Suisse. I have it all dissasembled except for the bolt holding the rear assembly together. See my photos. Should the bolt with my allen wrench inserted simply unscrew? Ive had it soaking in solvent and it wont budge. I am afraid to apply much more pressure until I know what is what.


Here is where I am at. This bolt wont budge!

Photo of the back.

before dissasembly
Its just my opinion but would leave it well alone :-) But what do i know.
Got any any pics of the Carlton ?
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Old 05-02-20, 08:14 PM
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Yes. It should unscrew.

See the 3 concentric holes on the backside? Those are for adjusting the jockey arm spring. You get access to it and adjustments by removing said bolt.
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Old 05-02-20, 08:26 PM
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Originally Posted by iab View Post
Yes. It should unscrew.

See the 3 concentric holes on the backside? Those are for adjusting the jockey arm spring. You get access to it and adjustments by removing said bolt.
thats what I thought. Ill add a bit more oomph to the wrenching. Thanks!
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Old 05-02-20, 09:03 PM
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Glenn's Manual dump incoming.













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Old 05-02-20, 09:07 PM
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Old 05-02-20, 09:09 PM
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Old 05-02-20, 10:07 PM
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Dang, that is awesome, Piff!
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Old 05-02-20, 11:02 PM
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Originally Posted by lostarchitect View Post
Dang, that is awesome, Piff!
My Uncle very kindly gifted me a copy of Glenn's when I really started getting into old bikes. It's such a great book and so cheap on ebay!
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Old 05-02-20, 11:24 PM
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Originally Posted by Piff View Post
My Uncle very kindly gifted me a copy of Glenn's when I really started getting into old bikes. It's such a great book and so cheap on ebay!
extremely useful. Thanks!
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Old 05-02-20, 11:58 PM
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Originally Posted by SB_Greg View Post
extremely useful. Thanks!
Sounds like you probably have it sorted now but one thing I always do is try and hold the cage tight in a neutral position, if the bolt is tight like yours and you turn against a stop it can screw things up.
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Old 05-03-20, 12:20 AM
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On this Nuovo Record schematic, you're trying to free part 811/A, the tension spring bolt.




For NR derailleurs, the grub screw (812/1A) is removed first before any disassembly. And, when assembling, the cage is wound before the grub screw is replaced. Makes it so much easier. It's a little more difficult with Gran Sport and Record. When putting it back together, you have to thread the spring bolt a little bit, wind the cage (working it around the fixed grub screw) and then finish tightening down the bolt.

So, when you do free that stuck bolt, you may wish to loosen it short of all the way and unwind the cage before completely removing the bolt. If you don't, be ready for the spring and cage to snap on you.
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Old 05-03-20, 10:08 AM
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Originally Posted by Piff View Post
My Uncle very kindly gifted me a copy of Glenn's when I really started getting into old bikes. It's such a great book and so cheap on ebay!
Agreed...very good information, is it "Glen's" repair manual that you are referencing..at 5 bucks it seems well worth the price of admission?
Ben

Last edited by xiaoman1; 05-03-20 at 10:11 AM.
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Old 05-03-20, 10:20 AM
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Originally Posted by xiaoman1 View Post
Agreed...very good information, is it "Glen's" repair manual that you are referencing..at 5 bucks it seems well worth the price of admission?
Ben
I think there are multiple editions, but I have this one:

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Old 05-03-20, 10:24 AM
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the main bolt won't unscrew until you've taken the tension off it by removing the
stop screw that lets the spring unwind.
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Old 05-03-20, 11:38 AM
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Originally Posted by steve sumner View Post
the [tension] bolt won't unscrew until you've taken the tension off it by removing the stop screw that lets the spring unwind.
Not true. But if the cage can be unwound first, it makes things easier.
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Old 05-03-20, 12:06 PM
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Originally Posted by Piff View Post
I think there are multiple editions, but I have this one:

piff,
thanks, just bought it.....less than 5 including free shipping...worth it just for the campy pics.
ben
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Old 05-03-20, 02:27 PM
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Originally Posted by SB_Greg View Post
thats what I thought. Ill add a bit more oomph to the wrenching. Thanks!
I would say, yes it should unscrew, and I have one that I recall I did unscrew many moons ago. But is there a reason you need to? The parts are 70 years old. If it turns freely and reasonably smooth, the spring wind up and springs, and ... there isn't a lot of wiggle or play, let it stay as it is.
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Old 05-03-20, 07:33 PM
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This was a fun little project. The diagrams really helped. Truly the best advice I received was to leave the back bolt in place.










Last edited by SB_Greg; 05-03-20 at 07:43 PM.
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