SOHC.co.uk Forums > CB500/550

Screw etiquette

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StPeter:
Interesting link, Tomb. I'll make sure to tighten mine up slow and slippery.

Tomb:
Just read my post again and its a big vague, sorry ::)

Its ALUMINIUM we're not allowed to use copperslip on as its 'sposed to cause corrosion of the aluminium, though I've never had any problems in 30+ years of using it on aluminium :o

Everything else we are 'sposed to use copperslip with, and all our torque settings are calculated using it, and the settings are that accurate they have slightly different settings for different manufacturers of copperslip (coppaslip)

StPeter:
That's how I read it anyway but nothing wrong with precision!
Dissimilar metals in the presence of electrolyte (something damp and conductive) will set up an electrolytic reaction. Theoretically I can se that coppaslip should be conductive. In a marine or other sever environment this could be an issue but what we're doing here is to pack the threads with something which excludes moisture. Horses for courses - if it was part of a cooling system for a nuclear power plant, I'd use the pukka stuff. On a bike crank case, I'm happy with your and my experience!

As to the different torque settings, wow! I guess that's aerospace work? I bet your torque wrench doesn't hang on a nail on the wall or rattle around in your tool box!

Tomb:
It wouldn't fit in a toolbox, but is kept spotless and calibrated annually ;D ;D ;D Annoyingly its scaled way above any settings on the bikes so not worth "borrowing" at home ::)

I work on a well known global company site that will remain unnamed by me for career shortening reasons :-X

ST1100:

--- Quote from: Tomb on July 05, 2012, 07:21:45 AM ---and the settings are that accurate they have slightly different settings for different manufacturers of copperslip (coppaslip)
--- End quote ---

Whilst having like 3 torque wrenches around (from 1.0Nm upward, plus some torque-screwdrivers...), I'm not that 'scientific'.
With a slight smear (not soaked!) on the threads I guesstimate -5% on the given settings in the w/shop manual; didn't snap one yet...  ;)


Dunno if allen-bolts really provide 'authentic look', think I'll use them only where its technically required (like deeply hidden, to be reached by ball-headed wrench).
And compared to polished aluminum or chrome, stainless steel always appears a tad too 'yellowish'...

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