paul c <(E-Mail Removed)> wrote:
> Haven't tried it myself but a guy I knew would point a plumber's propane
> torch toward such screws for a minute or so, then point an aerosol spray
> at it, I seem to remember the aerosol was nitrogen, maybe that's wrong,
> which would quickly cool the surrounding metal. I'm guessing this is
> one way to "break corrosion loose", as you put it. I think he was doing
> it on a brake caliper fixture which may not have been the same situation
> as an aluminum engine case. Is this a good technique in general or is
> it risky depending on the metal involved? (eg., aren't many carb bodies
> made from a zinc compound, not aluminum?)
Heat and cold are both really useful tools, yes. I tend to apply heat to
a lot of fasteners on old bikes before even attempting to undo them.
Also on things like 1970s bleed nipples on brake calipers. I've never
found it necessary on a clutch cover screw, though.
>
> (The same guy would try to turn a Phillips screw only once. If that
> didn't work first crack, he would immediately get out his impact driver,
> and if that didn't work right away he'd then try some kind of thread
> loosener chemical or apply heat.
He sounds like a good wrench. I tend to do the same.
> Phillips driver tip that had any gouges and always use the biggest size
> that would fit the screw.
Yes, again, good.
> Whenever I've used an impact driver, it
> seemed the most fruitful technique involved a good solid whack, not a
> bunch of little taps like I've seen people do, also a good heavy hammer,
> at least 32 oz. seems to be easier to hitting hard without hitting one's
> hand.
And again yes. The spring inside the driver is a tough'un, and you need
a bloody good wallop.
> This makes me wonder if anybody makes an impact driver with a
> hand guard, the kind some big cold chisels come with.)
Heh. I wish they did because I've hammered my own hand more than once.
I've never seen such a shield, and I'm sure there'd be a market for it
:-))
--
BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple
Suzuki TS250ER GN250 Damn, back to six bikes!
Try Googling before asking a damn silly question.
chateau dot murray at idnet dot com
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