<VV> Fwd: VV> Metal question, not necessarily Corvair
JVHRoberts at aol.com
JVHRoberts at aol.com
Thu Aug 14 15:08:59 EDT 2008
To make this work right, you have to either cool the inside of the post, or
heat the outside of the frame. I'd start with a hair dryer, since it's not
hard at all to lose the temper in aluminum if you were to use a torch. However,
if you, at the same time, blast something cold inside the post (I'd use dry
ice and acetone, VERY cold, and the liquid has enough mass to remove a LOT of
heat), this should break things loose. Rock it around, and if that doesn't
work, it's REALLY corroded.
If you go to put it back together, the usual recommendation is grease, NOT
antiseize. A LOT cleaner, and some anti seize compounds in an ambient
environment can actually accelerate corrosion, especially if there's never any heat
to drive off moisture.
Ask me how I know sometime... Grrrrr...
In a message dated 8/14/2008 10:10:08 AM Eastern Daylight Time,
ScottyGrover at aol.com writes:
In a message dated 8/11/2008 9:01:35 A.M. Pacific Daylight Time,
dkdewald at pasty.net writes:
At 21:20 8/10/2008 -0400, Marc Sheridan wrote:
>My bicycle has an aluminum seat post in a steel seat tube. While looking
>creaking noise, I discovered that I forgot to use anti-seize in this
>situation, because the seat post won't budge
>Has anyone found a way or a chemical that will break that bond? I've been
>shooting PB Blaster on it everyday for weeks and it still won't move. Heat
>is out of the question because it would ruin the paint and I can still ride
>it the way it is. I'd just like to get it freed in case I do want to
>it for some reason.
You may want to try cold. Since aluminum has a greater thermal expansion
coefficient it will shrink more than the steel tube when chilled.
Maybe you could try a can of circuit cooler from an electronics supply
house, but this might not get it cold enough. However, the ideal chill
could be made with liquid nitrogen. Maybe you could get the left over LN2
from your doctor's office at the end of the day when they have it available
to freeze warts.
If you get some, make a dish or cup like mold out of styrofoam to contain
the LN2 around the seat post. LN2 will boil and spatter on contact with
anything warm. Wear heavy gloves and eye protection [goggles]. LN2 on the
skin causes almost instant frostbite burns--painful, but will heal. LN2 in
the eyes will cause permanent damage.
If you end up trying this, please let us know how it works out.
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