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Author Topic: Potential for error  (Read 1755 times)

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Chris_H

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Potential for error
« on: 12 January 2010, 18:15:47 »
Imagine you're replacing some brake shoes and you have two very similar-looking aerosol cans on the ground beside you; one is grease to make the shoes rub nicely on the backplate, the other brake cleaner for preparing the whole shebang for new parts.

You could quite easily get a bit of lube on the new shoes and need to spray them with the brake cleaner couldn't you?

I think it would be a very good idea if the two cans were made really different-looking just in case some imbecile made a mistake.

Just a thought.  No reason for it really.... >:(
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Broomies Mate

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Re: Potential for error
« Reply #1 on: 12 January 2010, 18:17:21 »
Nice confession!  ;D

Easily done I guess.
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Lazydocker

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Re: Potential for error
« Reply #2 on: 12 January 2010, 18:29:19 »
You aren't the first to do it and I doubt you'll be the last :D :D
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Shackeng

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Re: Potential for error
« Reply #3 on: 12 January 2010, 18:32:32 »
Always use copper grease from a tub :y
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Kevin Wood

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Re: Potential for error
« Reply #4 on: 12 January 2010, 18:59:22 »
Quote
Always use copper grease from a tub :y

But don't tell ChrisGixer.  :-X

Kevin
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Chris_H

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Re: Potential for error
« Reply #5 on: 12 January 2010, 19:30:38 »
Quote
Nice confession!  ;D

Easily done I guess.
Keep an eye on the obituaries column.  It was the wife's Focus!
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Lazydocker

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Re: Potential for error
« Reply #6 on: 12 January 2010, 19:31:25 »
Quote
Quote
Always use copper grease from a tub :y

But don't tell ChrisGixer.  :-X

Kevin

Pray tell ;D ;D
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Martin_1962

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Re: Potential for error
« Reply #7 on: 12 January 2010, 20:11:00 »
Quote
Quote
Nice confession!  ;D

Easily done I guess.
Keep an eye on the obituaries column.  It was the wife's Focus!

Shoes = handbrake - just leave it in gear as well :y :y
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Kevin Wood

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Re: Potential for error
« Reply #8 on: 12 January 2010, 20:14:21 »
Quote
Quote
Quote
Always use copper grease from a tub :y

But don't tell ChrisGixer.  :-X

Kevin

Pray tell ;D ;D

Just anticipating the next round of the Chrisgixer / AndyB copperslip debate. <reaches for the popcorn>  ;)

Kevin
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Lazydocker

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Re: Potential for error
« Reply #9 on: 12 January 2010, 20:27:41 »
Quote
Quote
Quote
Quote
Always use copper grease from a tub :y

But don't tell ChrisGixer.  :-X

Kevin

Pray tell ;D ;D

Just anticipating the next round of the Chrisgixer / AndyB copperslip debate. <reaches for the popcorn>  ;)

Kevin

Ahh... That one ;)

Shove over :D
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Marks DTM Calib

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Re: Potential for error
« Reply #10 on: 12 January 2010, 20:53:08 »
Quote
Quote
Nice confession!  ;D

Easily done I guess.
Keep an eye on the obituaries column.  It was the wife's Focus!

God there a pain in the arse to do....what with having to remove the whole dam hub
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TheBoy

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Re: Potential for error
« Reply #11 on: 12 January 2010, 20:55:04 »
Quote
Quote
Quote
Nice confession!  ;D

Easily done I guess.
Keep an eye on the obituaries column.  It was the wife's Focus!

God there a pain in the arse to do....what with having to remove the whole dam hub
Ever done a Rover one?
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Entwood

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Re: Potential for error
« Reply #12 on: 12 January 2010, 20:58:49 »
There's an argument going on over on another forum (pikey based !!) where one guy is adamant that copperslip of any sort should NOT be used with alloy wheels .... he's on about "galvanic corrosion" ???

Apparently copper/aluminium in contact in a salt solution have this reaction, and he says that road salt is sufficient to cause it.

My chemistry is far too old (1965) for me to remember, although I did do "dissimilar metal corrosion" whilst in the RAF,but I think that is different ..  ??

I'll not post any quotes unless requested ....  but do any of the "knowledgeable" folks here have a view on the matter ??
« Last Edit: 12 January 2010, 21:00:47 by entwood »
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Lazydocker

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Re: Potential for error
« Reply #13 on: 12 January 2010, 21:10:05 »
Quote
There's an argument going on over on another forum (pikey based !!) where one guy is adamant that copperslip of any sort should NOT be used with alloy wheels .... he's on about "galvanic corrosion" ???

Apparently copper/aluminium in contact in a salt solution have this reaction, and he says that road salt is sufficient to cause it.

My chemistry is far too old (1965) for me to remember, although I did do "dissimilar metal corrosion" whilst in the RAF,but I think that is different ..  ??

I'll not post any quotes unless requested ....  but do any of the "knowledgeable" folks here have a view on the matter ??

Sod that... A smear of copperslip on the mating face when re-fitting alloy wheels means they come off when you want... It's the ferrous metal/alloy wheel combo that causes problems... Many a time I've been called out because the wheel wont come off :o :o
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Chris_H

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Re: Potential for error
« Reply #14 on: 12 January 2010, 21:10:37 »
My recollection is that each metal has an electro-potential and if you join two then you get a voltage generated that is the difference between the two.  Since alloy wheels are usually fixed to iron hubs there is always the likelihood of corrosion at the mating surfaces due to current flow that will be exacerbated by a saline electrolyte.

I would have thought that a slivver of copper in between would make little difference but that's not the same as trying it out!

Come to think of it, the wheels I just took off the Focus are alloy and they had copper grease on the hub face and they were covered in salt.  No sign of anything untoward corrosion-wise.
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