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Rear derailleur question

Old 11-24-12, 10:55 AM
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flyfisherbob
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Rear derailleur question

I'm heading into the last lap on a Centurion rebuild, and am stuck. Trying to attach the adjuster for the RD is just not working. The hole appears to be threaded, but is just not taking the little male threaded piece the cable runs through. My pic from before the removal seems to bear this out. Any suggestions? Did I miss something here?
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Old 11-24-12, 01:46 PM
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This installation is a feel thing. You must ensure that the piece, the threaded part, if fully pressed into its holder and this is a bit awkward to do as you attempt to turn the piece into the thread. Again, ensure the piece is pushed right into the holder, against the spring pressure. It will catch, if you keep trying, unless...

Before doing the above, forget the holder and the spring. Try threading the piece in just to ensure that the threads are still OK. It the threads prove go be good, go back to press, hold and twist. You will succeed.
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Old 11-24-12, 04:34 PM
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Thanks Randy! Worked just like you said. Now, if I can get the adjustment worked out, the bike is done. Pics when complete.
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Old 11-24-12, 05:09 PM
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You set the limits before you even ran the cable right?

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Old 11-25-12, 10:42 AM
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Originally Posted by Bianchigirll View Post
You set the limits before you even ran the cable right?

Um, no I'm guessing that setting them by sight? I didn't see this as recommended process from either the Bicycling repair manual, or from the youtube videos. As is, I am getting good shifts going up the rear cogs, but am getting a skip while going down.
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Old 11-25-12, 10:45 AM
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Those barrel adjusters have fine threads and they can be easily damaged... this can make re-installation a pain even when there is nothing wrong.

A little touch of grease to serve as an anti seize and I will often run a tap through the derailleur to chase the threads if they need cleaning up.
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Old 11-25-12, 11:32 AM
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Originally Posted by flyfisherbob View Post
Um, no I'm guessing that setting them by sight? I didn't see this as recommended process from either the Bicycling repair manual, or from the youtube videos. As is, I am getting good shifts going up the rear cogs, but am getting a skip while going down.
Perhaps it is just a habit I developed over the years. Once I have the cranks, rear wheel, chain and RD I set the limits on the RD. You sort of grab the upper portion of the RD by where it bolts to the frame, so that your thumb kind of rest where it has "shimano" printed on it. Then as your turn the cranks you slowly push on the RD body to run the chain up to the biggest cog. Once you get the chain there stop and screw the inner limit screw in until it stops. then run the chain back to the smallest cog and run it back up the largest to see if it easily rides on the largest cog.

If your simply rebuilding/overhauling this odds are the limits are still set from before.
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Old 11-25-12, 08:29 PM
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In my previous post regarding how to get the threads started, I forgot to mention that the threads should be lightly greased. I have run across quite a few of these situations where the threads have seized together due to lack of lubrication.
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