Hi. I am unable to tighten the anchor bolt on my front derailleur (Shimano Ultegra, FD-6503). It seems that the threading of either the bolt or the anchor bolt housing is worn down (so turning the Allen wrench doesn't do anything). I can't really tell whether it's the bolt or the housing, but I tried two other bolts (from my bottle cage) and got the same result.
My question: if it's the housing that is worn down, is my front derailleur hosed and I need to replace it? Or is there some way to reconstitute the threading?
reconstitute the threading? Any help is appreciated.
^^^^^^^^^^^^^^ The female threads are part of the deraileur clamp? Can you use a longer bolt and put on a nut?
Or: Loc-tite makes a thread restoration product that replaces the missing metal. Not good for highly stressed applications, but it ought to work fine for this. You spray a release agent on the bolt threads. You coat the threads, male and female, with a two-part epoxy resin mix, and screw the thing together. After it cures, you can unscrew the bolt, and it will leave usable threads in the hole.
Hi. I am unable to tighten the anchor bolt on my front derailleur (Shimano Ultegra, FD-6503). It seems that the threading of either the bolt or the anchor bolt housing is worn down (so turning the Allen wrench doesn't do anything). I can't really tell whether it's the bolt or the housing, but I tried two other bolts (from my bottle cage) and got the same result.
My question: if it's the housing that is worn down, is my front derailleur hosed and I need to replace it? Or is there some way to reconstitute the threading?
Any help is appreciated. Shiran
If ya do need a new FD, don't get a 6603 or DA 7703 as they are made for a 53(2)/39 and the length of the inside cage will hit the 42t on your crank when in the big ring(thanks shimano)..I think the 5603 will work as it is made for a 50/40....
"Leo Lichtman" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
"Gingi" WROTE: (Clip) Or is there some way to
Quoted message said:
reconstitute the threading? Any help is appreciated.
^^^^^^^^^^^^^^ The female threads are part of the deraileur clamp? Can you use a
longer
Quoted message said:
bolt and put on a nut?
Or: Loc-tite makes a thread restoration product that replaces the
missing
Quoted message said:
metal. Not good for highly stressed applications, but it ought to work
fine
Quoted message said:
for this. You spray a release agent on the bolt threads. You coat the threads, male and female, with a two-part epoxy resin mix, and screw the thing together. After it cures, you can unscrew the bolt, and it will
leave
Quoted message said:
usable threads in the hole.
Front derailleur clamp bolts and nuts need to be pretty tight to keep the derailleur from rotating on the seat post so in that sense they may be too highly stressed for the Loc-tite product.
I've had to file the flats on FD clamps more than a few times to get a tighter fit.
