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Polyurethane Bushing

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bucaneer

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I am trying to install a new rear springs with polurethane bushing. The spring with the bushing in place will not fit in the foward perch,it is to wide. Any sugestions on how to get it in place.
 
I've never installed them on the rear springs, only on the front? What would be the advantage?
 
They'll squeak incessantly until you replace them with bonded steel/rubber ones. I made this mistake with my Ford and have regretted it ever since. They require a spray with penetrating oil every few weeks to keep them semi-quiet.

To get them in just lube both the bush and where they fit into and force like buggery, going in at an angle and twisting if the springs are not connected to the diff yet. 4 by 2s and leveraging gets them in eventually.

Andy.

Andy.
 
You might also try compressing them with a C-clamp; giving them a good squeeze may cause them to regain their expaned shape slow enough to allow you to get them into the perch.

Alternatively, leave the clamp on as you offer the eye into the bracket, and SMACK them with a hammer to pass the eye from the clamp to the brkt__note that this will leave the clamp free to fall on you, gravity being the spring that does not fail...
 
dougie said:
If you lubricate them with the correct product prior to installation, they'll never squeak and you'll never have to bother with them again......
https://www.polybushings.com/pages/bushinglube.html
Click to expand...

Sorry Dougie... this is just not true in my experiences. Every poly bush I have installed has been done slobbered with the supplied lube but it only stands to reason that where there is a constant pressure and no absorption of the lube in the bushing materials then it will eventually work its way out. Takes about three months or so.

I'm going to try the black bushes from Toms Import on the front because they look nicer than the blue and supposedly don't squeak. Giving that the benefit of the doubt at this stage.

An interesting take on the squeak issue I found when replacing the sway bar bushes on our daily driver- a 1986 MB and discovered they have a layer of canvas type material moulded into the bushes where they rub on the sway bar and this retains enough lube to prevent squeaks for at least 350000km . I wonder if the poly bush guy will ever discover this trick.

Andy.
 
I have used BellRay waterproof grease on the polybushes on the front of my car
Used it on the Spitfire long ago, sticks like ####

Hans
 
Andy

It must be Tom's bushings....I installed a set on my '65 BJ8 street car nearly 10-years ago with poly-lube and never a sqeak. I also put a set on my '57 vintage racer, but I must admit, I'd never hear a squeak over the engine anyway.:glee:

 
The BMW message boards are full of threads on urethane bushes making noise, so Tom's evidentally found the secret sauce to keep them quiet.

Depends a lot on the bushing design (i.d. vs o.d.) but sometimes there's not a lot to be gained by converting to them; for a Z3/M rear suspension, not worth the trouble at all (there's so little rubber that can deform). The lower A-arms of an MGB = BIG improvement!

But a delrin or urethane bush rotates on its pivot (or worse, in the bore) where a rubber bush only deflects, so they will wear oblong, if enough miles are covered. Long-term on a street car, you're better off with the rubber.
 
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