Lars
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| posted on 7/6/03 at 08:15 PM |
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suspension bushes
How tight are these meant to be in the wishbone tubes?
I got the ones suggested in the book, but the bushes seem to slide in and out of the tubes very easily.
[Edited on 7/6/03 by Lars]
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Mark Allanson
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| posted on 7/6/03 at 08:55 PM |
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By sheer coincidence I just finished my upper bones today, I have book bushes (Y419's), they will push in 1/8" by hand but will need a vice
or the press at work to fit fully, the ID of my tubes are 21.00mm and the bushes measure 21.62mm without any excess pressure applied to the vernier
(if I push hard I can get this down to 21.45mm)
At least this will tell you if you have sloppy tubes or skinny bushes
Mark
 
Rescued attachment DCP_0818.JPG
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Lars
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| posted on 7/6/03 at 09:50 PM |
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sounds like either the tube or the bushes i've got aren't right.
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elewayne
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| posted on 8/6/03 at 03:35 AM |
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Bushing tubes
I used seamless 1" tubing with .095 wall thickness. that fits the Triumph bushes perfactly. I polished the inside of the tubes with fine
sandpaper and applied a small amount of dish soap to the inside of the tube to get them to go in with the help of a vice. They should be a good tight
dry fit.
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Mark Allanson
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| posted on 8/6/03 at 11:00 AM |
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I am going to use rubber solution glue as a lubricant, it will also bond the bushes in. I dont want to use soap as it contains salt which will promote
corrosion. BMW do a bush lubricant supplied with the new bushes which is also an adhesive (probable rubber solution glue!)
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splitrivet
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| posted on 9/6/03 at 11:08 AM |
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How about bonding em in with araldite,you'd never get em out again unless you burnt em out.
Bob
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Mark Allanson
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| posted on 9/6/03 at 04:53 PM |
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Araldite goes brittle with age and would start to chew up the bush
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Lars
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| posted on 17/6/03 at 03:36 PM |
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i just had a look at the bushes, don't have the right measuring tool at hand, but using a ruler it looks like they are about 21mm not 21.6,
which is probably why they don't fit that tight.
I think i'll do what elewayne did and use seamless 1" tubing with .095 wall thickness, which should give an inside diameter of about
20.3mm
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DaveFJ
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| posted on 17/6/03 at 03:57 PM |
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Put poly bushes in the fridge for a few hours before fitting.... makes the job a LOT easier
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andrew-theasby
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| posted on 26/6/03 at 10:06 AM |
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Sorry to change the subject a bit but im going to be fitting my bushes soon, and was wondering whether the steel part inside the rubber bushes should
act as a distance tube, ie to tighten the bolt up against or whether it should be free to move ? If so do you just tighten the bolts till it just
about nips or is there some other way of setting them? Thanks.
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kingr
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| posted on 26/6/03 at 10:13 AM |
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There's a long thread abuut this elsewhere, so I'd recomend that you read that. I think I'll stay well out of this!!
Kingr
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Rorty
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| posted on 27/6/03 at 03:02 AM |
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Torque it to the recommended figure for the size and type of fastener you're using.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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andrew-theasby
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| posted on 28/6/03 at 06:08 AM |
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Where would i find this torque figure? Im not worried about overstressing the bolt, more about nipping the lugs onto the bush so its stiff to move. Or
should i just not tighten it up that much and split pin/wire lock it? I just dont want the bolt turning in the lug and wearing the diameter of the
hole. Thanks.
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Rorty
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| posted on 29/6/03 at 12:26 AM |
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andrew_theasby, Nothing should be percievably loose. The PU bush should be an interference fit, and all the metal to metal contacts should be tight as
per the torque setting for the fastener involved.
If you check out my site, and click on "Formulas, Charts and Data" there is an online bolt and nut torque calculator.
Rorty Racing
[Edited on 29/6/03 by Rorty]
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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andrew-theasby
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| posted on 29/6/03 at 09:55 AM |
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I understand how the polyeurathene bushes work, by acting like a bearing, but im using the rubber ones, and as far as i can work out the inner surface
of the metal sleeve and the bolt should be the 2 bearing surfaces as there would be too much friction on the rubber thats just there to cushion the
vibration and allow for any flex. If this is so then when i tighten the bolts right up, the lugs are going to nip onto the sleeve possiby stopping it
from moving or at least causing a lot of wear on the ends of the sleeve and to the lug. I use a lot of interference fit bolts at work and i wondered
whether to use some of these which would allow me to tighten the nut down to achieve clearance on the bushes but the interference would stop the bolt
from spinning. Any thoughts on that? How has everyone else using these set them? Thanks for your pointers so far
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MikeR
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| posted on 29/6/03 at 10:20 AM |
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When i fiitted by bushes I bought some rubber and nylon lubricant from Halfords. Polished the inside of the tube my dremil and wire brush attachment.
squirted the lube everywhere then pushed the bush in as far as possible. When i couldn't push the bush in any more (which was on some wishbones
not very far and on some nearly all the way) I used a combination of vice and long bolt + washers to push / pull it into place.
This seems to have worked really well and all the bushes are now a tight fit - although i've only trial fitted the suspension. If someone could
point the link about tightening the bolts i'd be interested.
Oh, one thing i do know is don't fully tighten the suspension till the car is fully built and on level ground - that way you set the suspension
with no twist in the bushes at default & so less wear and tear.
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Rorty
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| posted on 30/6/03 at 04:46 AM |
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Andrew, OK, I'm with you now!
If you haven't got the Metalastic type rubber bushes which are vulcanised onto the steel crush tubes, then, as you point out, you'll have
to press your separate crush tubes into your rubber bushes. They are an extraordinally tight fit, as they're not supposed to pivot on the crush
tube; they just deform around it!
The best way to press the crush tubes in, is to keep them doused liberally with plain water (the water will evaporate, thereby virtually bonding the
rubber to the steel).
When you have assembled the bushes, you'll have to go through almost the same rigmarole again to press them into the wishbone tubes.
Once assembled, and mounted in the car, insert the correct sized bolts, but don't tighten them until the car is complete, and sitting at normal
ride height on the ground (ideally with driver on board too). Then tighten the bolts to the recommended torque value.
Cheers, Rorty.
"Faster than a speeding Pullet".
PLEASE DON'T U2U ME IF YOU WANT A QUICK RESPONSE. TRY EMAILING ME INSTEAD!
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andrew-theasby
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| posted on 30/6/03 at 08:17 PM |
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I see, so are you saying that when the wishbone moves, there should be no pivoting or movement anywherein the bush, bolt or sleeving but that all the
movement will be taken by the rubber twisting and flexing? If so that would make sense then about actually tightening the bolt onto the distance tube
locking it in place. Thanks for your help.
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