steel v alloy v copperslip

Gday gents

Somebody told me to copperslip my exhaust studs before fitting them Now
another has said that the chemical reaction with the copper will be even
worse than a steel v alloy reaction.

Anybody with an A level in engineering theory know the real answer?

Regards

Chas

www.artistic.flyer.co.uk/Honda.htm

 

Unless you want to remove the studs regularly, I'd just clean the threads in
the head with the appropriate tap and use a little light oil on the studs
when refitting. Lock two nuts together on the stud to help you 'wind it in'.
If you use copaslip, every time you remove the nuts when taking off the
exhaust, the damn studs may also undo!
Use copaslip on the nuts by all means though.

JB

 

If you want the studs to stay put, and the nuts to come off 'em, then don't
copperslip the studs, and use brass nuts to hold the exhaust on. This was
done on old motors and they almost invariably come apart. The only reason
manufacturers stopped doing it is that steel nuts are cheaper.

 

...often when you'd rather they didn't! ;-)

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KotPT -- "for stupidity above and beyond the call of duty".

 

A.Lee was seen penning the following ode to ... whatever:

There's a special BMW 'grease' for exactly this scenario - basically a
non-copper based anti-seize compound.

Trouble is that if you don't put anything on, you may well have to
spark erode them the next time you're trying to remove them...

 

Personally I'd use Loctite. IME it actually makes stuff easier to
remove. As they're 'glued' in position as opposed to corroded.

 

sweller came up with the following;:

wotesaid.

Loctite is a very good corrosion 'barrier', as well as a 'glue' and
something of a lubricant when initially fitting. For studs it needs to be
used sparingly though, with just a light smear on the threads of the stud.

 

yeah, but the essence of the point is that you shouldn't be removing studs.
Bolts, yes. Studs are supposed to stay put, and the only time you need 'em
removed is if they break or the threads strip. Neither of these scenarios
is particularly likely if you put brass nuts on them, which can be got - I
believe Halfords sell 'em now, in a limited range.

'course, if you replace 'em with stainless studs and nuts they're less
likely to rust - but I have noticed the odd one or two stainless nuts
managing to bind solid onto their bolts - generally they've bene tightened
relatively tight and do this binding thing about half-way undone when you
try to take it apart... Dunno how they do it, mind, but once stuck they only
come apart by breaking the bolt. Not sure if a stainless nut on a plain
bolt can do it either.

but for exhaust studs, brass nuts are the way to go. Make sure they *are*
brass, though, not brass-plated steel - part of the point is that in
extramis the nut should fail (e.g. by stripping) rather than the stud.

--
Austin Shackles. www.ddol-las.net my opinions are just that
"The breezy call of incense-breathing Morn, The swallow twittering
from the strawbuilt shed, The cock's shrill clarion, or the echoing
horn, No more shall rouse them from their lowly bed."
Thomas Gray, Elegy Written in a Country Churchyard.