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PV lower 'A frame' bushings 444-544 1958

uid 37415's pic
posted by  Old Kombi on  Fri Sep 7 09:46 CST 2007
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last visit: Thu Sep 30 01:42 CST 2010
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Hi all, this may be of some interest to PV owners that are in need of replacement for the lower A frame inboard pivot bushings.
After seeing what was entailed in replacing these and seeing the replacement rubber bushings - I decided to make my own.
I have been running glass filled PTFE (teflon is the DuPont trade name) on my 220 for about a year and am well pleased with the handling and wear of these.
Due to the fact that the loads/springs cause the lower frames to not line up (concentric with the stud) on the PVs I made these a bit different than the upper 122 bushings. First I machined the PTFE to 1.14 OD X .875 ID X 1.25 length. Next I made a "hat" from 6061 Al. this measured .874 OD X .719 ID (23/32") X 1" with a 1" OD brim, .1 thick and last, put a long chamfer on the crown.
This allowed me to install the PTFE part first (after a bit of wrestling with a small jack and clamp) Once these were in I could install the "hat", chamfer first and tighten the locknut and washer to pull everything concentric. I forgot to mention there was a small internal chamfer in the PTFE to accept and start the aluminum chamfer. Photo (hopefully) below.



Cheers!
OK








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    PV lower 'A frame' bushings 444-544 1958

    posted by  Pebee on  Fri Sep 7 11:14 CST 2007
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    last visit: Sat Jun 21 07:30 CST 2014
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    This looks like a great idea! For those of us without access to a lathe (or the skills to use one) would you consider making some upper and lower sets for sale?
    Pete.








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      PV lower 'A frame' bushings 444-544 1958

      uid 37415's pic
      posted by  Old Kombi on  Sat Sep 8 04:29 CST 2007
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      last visit: Thu Sep 30 01:42 CST 2010
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      They seem to be working well, I installed two more in the panhard rod on the rear suspension this morning and that seemed to help some "bump steer" that the car seemed to have (I have not driven this car much yet).
      The upper front suspension link seems to be unlike the lower, with some semi screw in bushings, I doubt it is a candidate for the PTFE fix, though I have not been in there yet on this car. I think next will be the rear trailing arm pivot bushings, as these seem to need attention on my car. There are some thumps still comming from the rear of the car and the shocks and axle housing bushings (the wrap around things with "U" bolts) seem to be OK if not perfect.
      Certainly I would be willing to make up some sets of these, once I have run them enough to evaluate how they will work/wear in real conditions. I am using some PTFE that is from another job, the next sets will be made from a glass/graphite filled type of PTFE which should self lubricate and last for quite a while.

      Cheers!
      OK







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        PV lower 'A frame' bushings 444-544 1958

        posted by  Belinda on  Sat Sep 29 16:01 CST 2007
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        last visit: Sat Aug 24 08:25 CST 2013
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        hi OK,

        Only thing I would worry about with PTFE is that it likes to "cold flow" when placed in compression. For this reason, we avoid it in compression applications at work. I think I have seen alternative materials for these bushings made out of Delrin (acetal), natural rubber, and polyurethane? It would be interesting to compare the properties of each, to try to deduce the optimum material.

        Here's a good website for property comparisons:
        http://k-mac-plastics.com/data%20sheets/polyurethane_properties.htm

        Teflon has nice lubricity properties, though.

        belinda







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