Rusted bottom bracket axle question



D

Dan Daniel

Guest
I pulled a bottom bracket out of a frame with no cranks that
had been sitting outdoors for a while. Shimano UN-52, spins
fine, etc. The tapers have some rust on them. I did a little
sanding and cleaned off most of the scale.

Will the force of installation on the tapers basically
smooth out any leftover rust interference? Do the tapers
need to be super smooth?

I don't want to ruin the cranks with a loose
installation. That is all- concerns about the life of the
BB, the smoothness, etc. aren't an issue- just not
ruining the cranks.

Thanks.
 
Z

Zog The Undenia

Guest
Dan Daniel wrote:

> I pulled a bottom bracket out of a frame with no cranks
> that had been sitting outdoors for a while. Shimano UN-52,
> spins fine, etc. The tapers have some rust on them. I did
> a little sanding and cleaned off most of the scale.
>
> Will the force of installation on the tapers basically
> smooth out any leftover rust interference? Do the tapers
> need to be super smooth?
>
> I don't want to ruin the cranks with a loose
> installation. That is all- concerns about the life of the
> BB, the smoothness, etc. aren't an issue- just not
> ruining the cranks.
>

I would put a bit of anti-seize on the tapers, having had
cranks seize to the spindle in the past such that even a
gear puller wouldn't shift them.

However, this is a religious issue!
 
M

Mark South

Guest
"Zog The Undeniable" <[email protected]> wrote in message
news:[email protected]...
> Dan Daniel wrote:
>
> > I pulled a bottom bracket out of a frame with no cranks
> > that had been sitting outdoors for a while. Shimano UN-
> > 52, spins fine, etc. The tapers have some rust on them.
> > I did a little sanding and cleaned off most of the
> > scale.
> >
> > Will the force of installation on the tapers basically
> > smooth out any leftover rust interference? Do the tapers
> > need to be super smooth?
> >
> > I don't want to ruin the cranks with a loose
> > installation. That is all- concerns about the life of
> > the BB, the smoothness, etc. aren't an issue- just not
> > ruining the cranks.
> >
> I would put a bit of anti-seize on the tapers, having had
> cranks seize to the spindle in the past such that even a
> gear puller wouldn't shift them.

How long had they been on there? Installation torque?

> However, this is a religious issue!

No, it's not. Religious issues are to do with unprovable
matters of belief. This is an engineering issue. Those who
like to obfuscate it prefer to deny the evidence so that
they can make a religious issue out of it, but it's not.
--
Mark South: World Citizen, Net Denizen, Taper Greaser
 
Z

Zog The Undenia

Guest
Mark South wrote:

> How long had they been on there? Installation torque?

From new, and not stupidly tight anyway. Fortunately the
other side wasn't seized so the BB and cranks were still
removable.