BME leading link pivot bushes

Discussion in 'Hacks' started by Jeff 8, Jun 5, 2013.

  1. Jeff 8

    Jeff 8 Been here awhile

    Joined:
    Feb 4, 2013
    Oddometer:
    122
    Location:
    Sydney, Australia
    I have a BME leading link, made by Bob Martin Engineering in 2001. Doing my pre Alpine Rally checks, I found play in the swingarm pivot bushes.

    Does anyone know if they are commercially available, or will I have to turn them up from a block?

    The outer of the brass is 19mm, the inner is 16mm.

    Also do the steel inners wear? There are no wear marks on the bolt, but it is not a very tight fit.



    [​IMG]

    Jeff

    :gun2
    #1
  2. jaydmc

    jaydmc Long timer

    Joined:
    Sep 26, 2008
    Oddometer:
    1,335
    More messurments are needed. How long are they? Do they have a shoulder. If you are in the USA I would check with McMaster Carr as if they are made, chances are they will have them and more often then not when you place an order they arrive the next day.
    BTW, on our leading link front ends we run two ball bearings on each side for a total of 4 bearings. Never considered bushings.
    Jay G
    DMC sidecars
    866-638-1793
    #2
  3. kshansen

    kshansen kshansen

    Joined:
    Jan 17, 2012
    Oddometer:
    385
    Location:
    Central NY
    I checked at McMaster here:
    http://www.mcmaster.com/#standard-metric-sleeve-bearings/=n2w0hp

    I see that they have 19mm od but those come in 15mm bore
    Then there is the 16 mm bore but those come in 20mm od

    These are the non-flange types that your's appear in the picture to be.

    They also show flange styles but seems id/od are in the same range.

    So if you have a lathe or access to one guess you could go either way. Or maybe use those with the correct od and then after pressing them in have them reamed to fit the sleeves.
    #3
  4. Jeff 8

    Jeff 8 Been here awhile

    Joined:
    Feb 4, 2013
    Oddometer:
    122
    Location:
    Sydney, Australia
    Thanks for the replies guys. I'm in Australia, forgot it didn't come up on the profile, hence using metric measurements :zilla. The width is 38.5mm and there is no shoulder.

    On reassembly I found that the clearance is ok, but the play was actually end play, so don't need the bushes so urgently now and just put some packing to reduce the side to side movement. The front end has done over 120,000 km of hard use and has never had a problem, but being a sidecar racer as well, I know how much load they are under, so check regularly.

    Jeff

    :gun2
    #4
  5. kshansen

    kshansen kshansen

    Joined:
    Jan 17, 2012
    Oddometer:
    385
    Location:
    Central NY
    I figured out the Australia part after I Googled the guy who built the front end!

    I'm almost bilingual here in the USA as far as measurements go that is.

    If the movement is side play how about having a light cut taken off the side of the inner sleeves? If you were near by I could do it in less time than it takes to type this reply in my old leather belt driven lathe!


    #5