Try measuring inside Dia with Vernier gauge and post dimensions...
today ive purchased some wishbone bush tube 25mm o.d and a wall thickness of 2.04mm,id 21 mm as required in the book,im useing triumph bushes qh 419
the thing that im not to impressed with is they seem to push in with ease.i thought i would have to either draw them in or press them in.the same as
when you fit a new bush to a modern day car.this has realy got me stumped as i am wanting to get on and make my wishbones,ive heard a mention on here
of glueing them in but firstly with what glue?and should this be nessecery.has anyone else had these problems and how have they overcome them.any
suggestions would be great
[Edited on 8/8/03 by ChrisW]
they shouldnt go in easy i think. no ideas really, there have been previous discussions about the precise wall thickness i think. people talk about freezing them so they shrink!
Sorry to hear your probs m8
Try measuring inside Dia with Vernier gauge and post dimensions...
the tubes are 21 mm inside diameter,a few of the bushes slide in with ease and the others need to be pushed in.but will be able to push them in by hand is this acceptable or not.this is causing me a real problem
I used 25mm 2mm wall thickness seamless tube and had to use a bolt and several washers to drive the frozen and lubricated bushes into position, I used
BMW bush adhesive which is a lubricant when wet and dries to vuncanise the rubber to the steel.
Rescued attachment BushAdhesive.jpg
mark did you purchase the glue direct from b.m.w.and what did you freeze ?the bushes or the wishbones?allso how mutch movement is in the bushes when they are just pushed in by hand?i seem to have a few loose ones so i think ill order a few replacements
Yes, the 'stuff' cam direct from the BMW parts department complete with BMW part number.
I froze the bushes, when pushed in by hand, they went in about 5mm easily. I trial pushed one in using shampoo as a lubricant (it does not contain
salt like washing up liquid does) and it did go in really easily (mild pressure using a workmate).
I suggest you get a left over piece of tube and try one. Make sure you ream the bushes to 10mm BEFORE you fit them if this is the size of bolt you are
using.
I have about 10 bushes left over as I used Bluebird rear arms after I bought the bushes, if you bugger some bushes up I could send some to help you
out if required
Rescued attachment Ream.jpg
someone chilled the bushes so they shrank apparently, warm up to a tight fit.
i think there should be no movement, because movement will cause them to wear out eventually, the flex comes from the actual rubber twisting up.
when i tried getting the old shockers off my sierra backend, you could move them thru 90 degrees without any real movement, only flex.
mark, when you reamed them was that the rubber or the crush tube you drilled?
[Edited on 7/8/03 by JoelP]
Your'e right, the only movement should be in the rubber, I bored a 3/4" hole in the centre of my workmate to hold the bush and then reamed the crush tube. I tried it without the holding method, and the crush tube sheared away from the rubber.
Aaaaah, so THAT's how bushes work. Now I see the light!
btw.. does the bush take the axial stresses as well (front to back forces on the wheels)? or does the tube clonk against the bracket or something.
quote:
Originally posted by blueshift
Aaaaah, so THAT's how bushes work. Now I see the light!
btw.. does the bush take the axial stresses as well (front to back forces on the wheels)? or does the tube clonk against the bracket or something.
Please Pete- you'll only set people off! 
Rorty, Syd- don't reply to this- we know you don't agree with each other!
James
[Edited on 8/8/03 by James]
quote:
Originally posted by pbura
......RC himself said that the crush tube should spin on the bolt.......
thats one dappa car you got as the avatar alan. you built it? blinding bodywork if you did...
well, blinding anyway i suppose, but you must be buzzin if you did do it!
Thanks Joel.....
That is how it will look in a few months after I rework it...
Meanwhile check out...
http://www.desicodesign.com/meerkat/
stuck it on favs, i'll be back when i got a rolling thing going! Looks tricky and time consuming, i think mines just gonna be an ugly duckling!
quote:
Please Pete- you'll only set people off!
quote:
No Pete you are right, there is NO controversy.....the steel tube in a metalastic bushing is intended to be clamped up and be non-rotating....
The orange tin from BMW in Mark's picture with Terpentin Ersatz on it, that means turpentine substitute, or white spirit as we call it. Has it
been transferred to another tin?
yours, Pete.
No the container was sealed, perhaps white spirit does the trick, it was only £2.38 inc VAT for the litre, so its cannot be too technical.
I does work well though
You freeze the bushes, not to make them shrink, it is to stop the rubber mushrooming as you press them in