Bicycle Mechanics - '72 Campy Nuovo Record Dérailleur Rebuild Question
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12-01-06, 03:54 PM
Hello Fellow Bikers,
I just took apart and cleaned my '72 Campy Nuovo Record dérailleur, but am not sure how much tension the jockey pully cage needs. I gave the cage one spin, and it's pretty tight. So much so, that the chain is under too much strain for any smooth forward pedalling. Of course, I installed the cage the first time with NO spin and there was not any tension to pull the chain backwards. My thinking was one spin, but that's too much as I've said.
If anyone is familiar with the proper procedure, I'd love to know about it. Perhaps, I've got the tension spring in the lower body in the wrong position. Hmm, any help is appreciated.
12-01-06, 05:04 PM
First off, make sure you put locktite on the threads of the bolts that hold the cage together to ensure they stay put. Second, tighten it so the wheels turn freely, but there isint a whole lot of play side to side. Of course there is going to be some play, because if there is none you've overtightened it and the pully wont spin freely. The locktite will ensure that bolts wont go anywhere.
12-01-06, 06:03 PM
Thanks, Bassplayinbiker, for your thoughts. The jockey wheels spin freely, and, yes, I did use locktite, to assemble the cage together, but the issue is the spring tension on the cage. The spring I'm refering to is in what's called the lower body. If you can see the attachment you'll see the spring is listed as part number 813/A (sorry, that's the biggest file I could upload here, so the diagram is rather small) which fits in the "lower body."
If I recall, the procedure was to give the entire cage assembly a 360 degree spin counterclockwise once you've taken out the stop bolt (part number 812/1A) to allow for a complete turn. When I do this, the tension is much too great and the chain doesn't travel through the jockey wheels very freely. Maybe someone knows the proper procedure for setting the tension. This is a standard length dérailleur used on a road bike with 14/22 freewheel.
Any thoughts will be welcomed,
12-01-06, 10:37 PM
I found this thread (http://www.campyonly.com/phpBB2/viewtopic.php?p=3713&sid=58824dd69735a4a675e1e562813a625d) on campyonly. It gives some guidance on the procedure. Maybe it will help. It that does not help, maybe an old Barnett's or an email to Campy will help.
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