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Squeaking poly-urethane bushes

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salvi Avatar
salvi Salvi Schrijen
Voerendaal, Limburg, Netherlands   NLD
1970 MG Midget MkIII "Annie"
2011 Mini Clubman
Hi,

I replaced all the front and rear rubber bushes to Poly-urethane bushes 2 years ago.
It came as a package together with a kind of grease, which I used generously.
After a very long holiday drive from the southern part of France toward the Netherlands, my little MG started to squeak on all 4 sides. I expect the bushes are dry due to hot weather and lots of rain..

Do you have any experience what would be the best thing to do?
Can I spray some Lithium grease on the poly bushes or would this increase my problem?

Thanks
Salvi

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Kerr Avatar
Kerr Platinum Member Norm Kerr
Ann Arbor, MI, USA   USA
I have heard of that happening, but never seen it myself but here are some thoughts:

1) normally any grease or oil is bad for rubber bushings (it eats them), but poly is inert so there should be no downside to trying to spray some lubricant in there to stop the noise. So, your idea should be OK.

2) rubber bushings are meant to twist (bonded to a metal tube which is clamped by the bolt, the rubber twists when the suspension moves), but poly is meant to rotate (no metal tube bonded in), so if there is a squeak it could be from deep inside (where it is rotating on the bolt). Spraying on lube might not be able to get in there, but maybe worth a try before going to the effort of full removal to re-grease.

3) the grease deep down inside should not really be able to get out, so maybe the noise is coming from somewhere out near the edges where it could have been rinsed off or contaminated by dust, so maybe spraying on will be enough!

So, it seems like your idea should work, and shouldn't have any real downside. And if it isn't effective then you'll still have the option of removing them and re-greasing them (trying the spray shouldn't hurt anything).

Good luck and let us know what you find.

Norm

salvi Avatar
salvi Salvi Schrijen
Voerendaal, Limburg, Netherlands   NLD
1970 MG Midget MkIII "Annie"
2011 Mini Clubman
Hi Norm,

Thank you very much for your extensive answer!
This is really helpfull.
I wiil first try to spray the bushes with lithium-grease and then report the results here.

BR
Salvi

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salvi Avatar
salvi Salvi Schrijen
Voerendaal, Limburg, Netherlands   NLD
1970 MG Midget MkIII "Annie"
2011 Mini Clubman
Hi Norm,

A small update: Spraying around with Lithium grease did not decrease the amount of squeaking.
I will start to disassemble the bushes and grease them again.

Thanks again for your contribution!
Salvi



Edited 1 time(s). Last edit at 2017-08-18 11:42 AM by salvi.

J Baz Avatar
J Baz Silver Member Jerard Basmagy
Middletown, New Jersey, USA   USA
Just a little tip I used silicone o-ring grease I got at a local pool store. Its waterproof and has held up well with no squeaking. Just my 2 cents.



jb

Too soon we get old, too late we get smart!

minimarc Avatar
minimarc Bob Marcum
BREVARD, North Carolina, USA   USA
Dielectric grease is a non-petroleum, water proof grease that will work too.



Bob Marcum

1959 AH Bugeye Sprite
1960 Morris Minor Tourer
Ex Mini Vintage Racer

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