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Urethane bushes do I need metal inserts?
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Author:  meeni [ Thu Sep 10, 2015 5:10 pm ]
Post subject:  Urethane bushes do I need metal inserts?

Just a quick one, I've got a set of yellow urethane bushes for my lower control arms and they don't have a metal insert in them. Do I need one or do they just run on the pin as is?

Cheers

Sean

Author:  michaelb [ Thu Sep 10, 2015 5:30 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

I think most urethane/nolathane bushes are a neat fit on the shaft without any inside metal inserts.
Mine are.

Author:  meeni [ Thu Sep 10, 2015 6:14 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

Cool yeah they're snug so il leave them as they are! Cheers!

Author:  drmini in aust [ Thu Sep 10, 2015 10:23 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

Most urethane bushes come with grease. Don't run them dry..!

Author:  awdmoke [ Fri Sep 11, 2015 9:11 am ]
Post subject:  Re: Urethane bushes do I need metal inserts?

Yeah those are snug fit with LOTS of the white grease.
Rubber gloves time!

Author:  mini_mad_matt [ Fri Sep 11, 2015 5:40 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

The last few Nolothane branded bushes that i have fitted to cars (not minis) have been supplied with their own packets of grease which actually say it's molybdenum disulfide.

So i suppose that stuff is fine for the bushes too.

Author:  drmini in aust [ Fri Sep 11, 2015 9:59 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

Regular lithium chassis grease is OK too.

Author:  Phil 850 [ Fri Sep 18, 2015 8:49 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

I'm surprised you have to Grease the bushes.
The elastomer is there for NVH and to eliminate "sliding surfaces" so you eliminate wear and reduce maintenance by not having to grease them.
In good design, all of the suspension movement should be taken Within the Elastomer :wink: , not by having the elastomer sliding on the suspension elements. :shock:

Author:  drmini in aust [ Fri Sep 18, 2015 9:00 pm ]
Post subject:  Re: Urethane bushes do I need metal inserts?

Lurethane has its uses and is oil resistant, but...
If you try and make lurethane tight like a `live rubber bush', it tears up.
In a previous life (tooling engineer) I had a lot of experience with lurethane used in press tooling, for metal forming.

The other problem with lurethane inner bottom bushes is they flow and deform with stress.
That's why I and others still use original bushes, for road use.

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