Author Topic: silentbloc bushes.  (Read 276 times)

0 Members and 1 Guest are viewing this topic.

Offline Roys rider

  • Member
  • *
  • Join Date: Nov 2016
  • Posts: 18
  • Location: Alderley Edge
silentbloc bushes.
« on: 10 Nov 2017 at 14:43 »
Hi
I have been putting the D/fly forks together from NOS parts. Trying to put the bolt through I found that one of the Silentblocs had been badly made and the inner tube was offset about half way across at the middle (and at the open end), so it is going to have to come out. Without damaging the new paint, which burning would do, how do I do it? I know I should have checked first.
Cheers
Peter

Offline eddie

  • Master Member
  • ****
  • Join Date: Mar 2006
  • Posts: 1125
  • Location: Hampshire, UK
Re: silentbloc bushes.
« Reply #1 on: 11 Nov 2017 at 08:02 »
Hi Peter,
             I presume, from your description, that the silentbloc bush has been poorly manufactured so that the outside is eccentric to the inner - in which case it will be of no further use.
   The only way I can suggest of removing the offending item would be: - carefully scrape away the paint from the ends of one of the bosses for the front wheel spindle (so that you can clamp the swinging arm securely in the vice without bursting the paint from the boss). Then repeatedly attack the rubber of the bush with a small drill (about 1/8") until you can break out the centre tube. With the centre tube removed, attack the outer tube with a rotary file until it collapses and can be removed.
  Unless you have a replacement, your biggest problem will be finding another silentbloc. I believe there are similar bushes available but they have a 12mm bore instead of ". Also, you will need to make up a spacer, as the centre on the genuine article is extended to abut the opposite silentbloc.

  Hope this is some help,
                                     Regards,
                                                   Eddie.

Offline Roys rider

  • Member
  • *
  • Join Date: Nov 2016
  • Posts: 18
  • Location: Alderley Edge
Re: silentbloc bushes.
« Reply #2 on: 11 Nov 2017 at 21:19 »
Thanks Eddie I was hoping you would come up with something. It is a manufacturing fault with the inner tube at an angle. Dick (at LDMCC spares for those who don't know) has some but didn't have them in part number order. I have given him the size I need and have my fingers crossed. 
I will re-post when I have something more to tell. In the meantime I have fitted the rear wheel.
Peter

Offline Roys rider

  • Member
  • *
  • Join Date: Nov 2016
  • Posts: 18
  • Location: Alderley Edge
Re: silentbloc bushes.
« Reply #3 on: 17 Nov 2017 at 11:16 »
Hi
Dick at LDMCC spares sold the last front pair a month ago. There are some manufacturers however they are metric. I am trying to phone someone (Superflex) who does replacements for classic car bushes. I'll post when I know more.
Peter

Offline Roys rider

  • Member
  • *
  • Join Date: Nov 2016
  • Posts: 18
  • Location: Alderley Edge
Re: silentbloc bushes.
« Reply #4 on: Yesterday at 20:50 »
Hi
Further to my search for D/f front swing arm bushes, Silent-bloc, I have found some suppliers but I am stuck for the measurements. I know they are roughly 1" OD, 1/2" ID, and 4" with the extension. Can someone give me accurate figures, preferably in metric? I need OD of big tube, ID of small tube, length of big tube and length of small tube.

If I find one that works the club will probably restock.

Thanks in advance.
Peter

Offline eddie

  • Master Member
  • ****
  • Join Date: Mar 2006
  • Posts: 1125
  • Location: Hampshire, UK
Re: silentbloc bushes.
« Reply #5 on: Yesterday at 21:15 »
Peter,
          Surely, you can get those dimensions from the faulty silentbloc that you are removing from your swinging arm.

 Eddie.