Don't be tempted to fit lurethane ones, they wear worse than the rubber does.
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| Engine steady rubbers poor fit & sqeaky https://www.ausmini.com/forums/viewtopic.php?f=2&t=81448 |
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| Author: | phillb [ Thu May 16, 2013 6:49 am ] |
| Post subject: | Engine steady rubbers poor fit & sqeaky |
A while back I replaced the engine steady rubbers and have recently realised they are squeaky. With engine off if i push on the motor they squeak. They also were/are a terrible fit and seem to bulge out. Is this another case of poorly made parts. I think I've still got the old ones so I'm tempted to refit them. |
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| Author: | goodie [ Thu May 16, 2013 8:12 am ] |
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Phil , did you put any rubber grease on them at all ? The last time i did mine , i put a smear of rubber grease on them for this reason . |
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| Author: | drmini in aust [ Thu May 16, 2013 8:20 am ] |
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Don't be tempted to fit lurethane ones, they wear worse than the rubber does.
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| Author: | phillb [ Sat May 18, 2013 4:12 pm ] |
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Yeah perhaps I should have added some rubber grease. Next time they are off I will. Pretty sure mine are the rubber ones. How do you tell. Are the urethane one coloured? Still think the fit was terrible. They seemed too big. Was like stuffing a pillow into a letterbox slot. 
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| Author: | drmini in aust [ Sat May 18, 2013 4:23 pm ] |
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Typical of many `replacement parts' that we have to buy now, because all the good ones have now gone tata due to cost. (never mind the quality, tell em the price, son!) Example- I put new outer door handle rubbers (bought here) on my `70 car after repaint 2 years ago, they have since shrunk in under the escutcheons due to the poor rubber quality. When I get a round tuit, I have some nice condition 30 or 40yo ones that can go back in instead. 
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| Author: | kirby [ Sat May 18, 2013 5:02 pm ] |
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phillb wrote: Yeah perhaps I should have added some rubber grease. Next time they are off I will. Pretty sure mine are the rubber ones. How do you tell. Are the urethane one coloured?
Still think the fit was terrible. They seemed too big. Was like stuffiness a pillow into a letterbox slot. http://i807.photobucket.com/albums/yy35 ... b75745.jpg What brand of where did you get them?, if they are a cheap no name one then that's likely your problem. Rubber grease should be used sparingly and probably wouldn't have helped in that picture. Was the engine steady clean and free of debris? And on poly urethane, It can come in any colour including black. So judging by colour is useless. You can tell polyurethane from rubber as its usually machined or moulded which will have a much smoother texture than rubber which is bonded or vulcanized. On the subject of polyurethane. A good polyurethane bush will outlast a rubber bush by a factor of 10 and will be softer if desired. But it comes down to cost, But a cheap one wont. Many people will tell you that urethane is harder than rubber and is therefore less durable (but its great for race engines  )
But that is not the case. hardness is often measured in the shore hardness scale which has both hardness and durability measured against rebound forces, torsional loads etc the main thing to note is hardness is not proportional to durability! Not even remotely. Rubber must be vulcanized to be useful, depending on how this is done it usually ends up extremely soft or extremely durable but never both. This is best seen in tyres. Polyurethane on the other hand can be vulcanized, moulded, bonded, machined etc so it is much more versatile. As far as bushes for a mini goes, Go and buy either a rubber or polyurethane bush from a reputable manufacturer. As a general rule if that manufacturer makes its parts in China or India and doesn't own the means of production themselves dont buy it. Importantly for polyurethane bushes. if the manufacturer cannot provide you with hardness data of a particular bush don't buy it as many cheaper bushes are just moulded from one batch of urethane regardless of application. There are far more bad polyurethane bushes on the market than bad rubber ones are polyurethane is easier to make and more popular. In short find a better bushing. |
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| Author: | Babes [ Sat May 18, 2013 5:16 pm ] |
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I put some urethane ones in, they lasted about 3 months before completely breaking in half, quality! |
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| Author: | phillb [ Sat May 18, 2013 5:33 pm ] |
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To be honest I don't know where I bought them. Got them ages ago prob when ordering other items. |
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| Author: | drmini in aust [ Sat May 18, 2013 6:58 pm ] |
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Urethane cannot be compressed into a `live' bush as rubber can. If you try, it will fail in short order. Urethane bushes work for a while if greased, but no way it outlasts rubber. And it 'flows' under load, which is why I won't use them for the bottom arm inner joint. Been there, done that, lasted 5 mins, gone back to live rubber bushes ages ago, no more problems. 
ps. I know a bit about where urethane works and does not, I was press tooling engineer at Rheem for many years. |
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| Author: | justminis [ Sat May 18, 2013 7:32 pm ] |
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After experiencing the same crap you have with these bushes, I tried these a few years ago and they work great - http://www.minispares.com/product/Class ... sic/steady bush.aspx| |
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| Author: | Mick [ Sat May 18, 2013 9:27 pm ] |
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justminis wrote: After experiencing the same crap you have with these bushes, I tried these a few years ago and they work great -
http://www.minispares.com/product/Class ... sic/steady bush.aspx| I was gonf to say just that. They go in quite nicely(I squeeze them through in a vice) and seem to be good products. I haven't had to change them, on any of my minis, and they've been in three for one and four years for the other. |
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