ChrisW
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| posted on 2/5/03 at 09:02 PM |
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Fitting Poly bushes
Simple question - Do I need to lubricate Poly bushes in any way before fitting them to my wishbones? They seem to go in without too much bother just
wondered if I should be greasing them or anything?
Chris
My gaff my rules
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Viper
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| posted on 2/5/03 at 10:44 PM |
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no lube needed
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dmottaway
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| posted on 3/5/03 at 04:45 PM |
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it was my understanding that the bush was to be "press fit." that is, tight enough that, in the case of rubber bushes, the only flex in
the a-arm came from the rubber. obviously poly doesn't flex like rubber, thats the whole point, so its OK for the poly to slide? and if so,
wouldn't it be a good idea to lube it, if only to prevent rusting?
curious
dave
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Viper
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| posted on 3/5/03 at 04:52 PM |
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the inner sleeves should realy be stainless steel, there a few threads on here about this very subject.
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dmottaway
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| posted on 3/5/03 at 05:47 PM |
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let us take this a step farther.
rubber is used to isolate the body and contents from the harshness of the road.
poly is use to give the precision of rod ends without the expense.
could we not machine a bushing out of say, aluminum and have the desired precision but not the cost?
back to reality.
how much material should be between the inner sleeve (crush tube) and the outer tube of the a-arm?
if I use 1 inch tube with 1/16 wall, a 7/16th bolt, and a crush tube with 1/16 wall, that doesn't leave much room for the
poly/rubber/whatever.
If I go for a larger tube on the a-arm, how much clearance should be left between the tube and the base of the bracket? Seems there shouldn't
be any concern so long as there is no binding between the a-arm and the bracket. Is this correct?
my head hurts
dave
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stephen_gusterson
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| posted on 3/5/03 at 07:20 PM |
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rorty is the expert here....
where is he?
atb
steve
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dmottaway
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| posted on 4/5/03 at 06:03 PM |
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was looking at "Chassis Engineering" by Herb Adams this morning and he says that rubber bushings do not need any lubrication because there
is no sliding, just flexing. Any other material will need lubrication because the device has evolved away from being a mere bushing to more of a
bearing. And bearings need lubrication. This includes polyurethane, nylon, and, yes, steel!
If made to close enough tolerances steel-on-steel bushings (bearings) give the precise motion required of the best handling car. Just don't
complain about the road noise transmitted to the car.
and then we get into spherical bearings....
hmmmmmm
dave
[Edited on 4/5/03 by dmottaway]
[Edited on 4/5/03 by dmottaway]
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Rorty
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| posted on 24/6/03 at 06:25 AM |
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I really didn't want to get involved in this thread, as it's been covered several times before. However, to answer ChrisW's
question. The answer, as Viper correctly says, is "no lube needed".
The Poly bushes shouldn't rotate within the wishbone tube, and therefore don't need lubricating.
The inner bore of the Poly bush however, where the crush tube pivots, does definitely need to be lubricated with Moly grease.
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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