Bottom bracket cup compound

newby1493 said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano uses
between the removable cup and the BB bearing has been removed and I
was wondering what the best replacemanet would be?

"Best" is a matter of opinion. "Adequate" can be quantified better.
Virtually any anti-sieze preparation (available from most auto parts
and hardware stores) will work for metal BB threads in a metal BB
shell. If an anti-sieze compound is not available, then ordinary
bearing grease will do. Plastic cups should probably only be coated
with something supplied by the maker of the BB.

Quoted message said:

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit.

Not good. Better to try to keep it as-is than resort to threading it
for an Italian BB, though.

Quoted message said:

I have Paint, Locktite blue, grease
and teflon tape at my disposal. The cup seems loose enough for one
wrap of teflon tape but that seems likely to migrate in use. Don't
know if the locktite wouls fill the gap.

Someday, you would be cussing up a storm about the choice of Loctite.
Teflon tape, as you note, does tend to migrate, but it might be worth
trying here; at worst, I think it would do no harm.

Quoted message said:

Shimano originally used some kind of guey tape on the inside of the
cup that I have heard works quite well. Any suggestions?

Okay, if it was me, with just that set of materials available, I guess
I'd try the teflon tape first. If that didn't work, I'd be really
tempted to cast around for somebody who has a BB thread chaser, clean
the BB shell mercilessy, *carefully* dope all but the first two lands
of thread with a very thin coat of machinable epoxy, then get the
threads chased after it had fully cured. Then I would use anti-sieze
on the BB threads.

There are probably better solutions available.

--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

newby1493 said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano uses
between the removable cup and the BB bearing has been removed and I
was wondering what the best replacemanet would be?

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit. I have Paint, Locktite blue, grease
and teflon tape at my disposal. The cup seems loose enough for one
wrap of teflon tape but that seems likely to migrate in use. Don't
know if the locktite wouls fill the gap.

Shimano originally used some kind of guey tape on the inside of the
cup that I have heard works quite well. Any suggestions?

If you already have Teflon tape, use it. It should work.

Otherwise, anti-seize compound works better than plain grease. Still, I
have to re-do mine once or twice a year. With grease the clicks and
creaks return in a week or two. I haven't tried Teflon tape on this
bike, but it has worked well for me in the past.

Matt O.

Matt O'Toole said:

Quoted message said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano
uses between the removable cup and the BB bearing has been removed
and I was wondering what the best replacement would be?

Quoted message said:

Quoted message said:

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit. I have Paint, Loctite blue, grease
and Teflon tape at my disposal. The cup seems loose enough for one
wrap of Teflon tape but that seems likely to migrate in use. Don't
know if the Loctite would fill the gap.

Quoted message said:

Quoted message said:

Shimano originally used some kind of gooey tape on the inside of
the cup that I have heard works quite well. Any suggestions?

Quoted message said:

If you already have Teflon tape, use it. It should work.

Quoted message said:

Otherwise, anti-seize compound works better than plain grease.
Still, I have to re-do mine once or twice a year. With grease the
clicks and creaks return in a week or two. I haven't tried Teflon
tape on this bike, but it has worked well for me in the past.

This joint does not want lubricant but rather a home position that
does not weld from fretting. Anti-seize grease allows lubricated
assembly while remaining essentially unlubricated after tightening.
The soft metal particles prevent steel-on-steel welding and make
removal practical. Teflon tape has the purpose of lubricating. I
don't believe that is what the joint needs. In fact, a right hand
thread, right hand cup, is probably better off with oil assembly so
that it doesn't unscrew. It needs a bit of welding to stay.

Jobst Brandt

newby1493 said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano uses
between the removable cup and the BB bearing has been removed and I
was wondering what the best replacemanet would be?

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit. I have Paint, Locktite blue, grease
and teflon tape at my disposal. The cup seems loose enough for one
wrap of teflon tape but that seems likely to migrate in use. Don't
know if the locktite wouls fill the gap.

Shimano originally used some kind of guey tape on the inside of the
cup that I have heard works quite well. Any suggestions?

Unless I misundersatnd you, you're talking about the joint between the
*inside* of the cup and the bb cartridge, not the *outside* of the cup
and the frame's threads, right?

I've also noticed the goop Shimano puts in there, and I've also wanted
to replace what's become displaced, but I don't know what it is either.
I've heard others mentions bearing seating (or is it bedding?) compound
or something similar, so I'd also want to hear what others might
recommend.

So far I've just put lots of greas in there and tightened it up. So far
so good!

newby1493 said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano uses
between the removable cup and the BB bearing has been removed and I
was wondering what the best replacemanet would be?

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit. I have Paint, Locktite blue, grease
and teflon tape at my disposal. The cup seems loose enough for one
wrap of teflon tape but that seems likely to migrate in use. Don't
know if the locktite wouls fill the gap.

Shimano originally used some kind of guey tape on the inside of the
cup that I have heard works quite well. Any suggestions?

Grease or antisieze, between both cups, tap the right one off, grease,
tap back on.

Quoted message said:

newby1493 said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano uses
between the removable cup and the BB bearing has been removed and I
was wondering what the best replacemanet would be?

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit. I have Paint, Locktite blue, grease
and teflon tape at my disposal. The cup seems loose enough for one
wrap of teflon tape but that seems likely to migrate in use. Don't
know if the locktite wouls fill the gap.

Shimano originally used some kind of guey tape on the inside of the
cup that I have heard works quite well. Any suggestions?

Unless I misundersatnd you, you're talking about the joint between the
*inside* of the cup and the bb cartridge, not the *outside* of the cup
and the frame's threads, right?

I've also noticed the goop Shimano puts in there, and I've also wanted
to replace what's become displaced, but I don't know what it is either.
I've heard others mentions bearing seating (or is it bedding?) compound
or something similar, so I'd also want to hear what others might
recommend.

So far I've just put lots of greas in there and tightened it up. So far
so good!

Yes, I was not clear in my post, My threads appear fine and they
don't move between reseatings. My guess is that the inside of the
adjustable cup causes the clicking. Shimano cups without that bedding
compound are a little loose and will rock. I might try a thin wrap
with epoxy around the bearing letting the epoxy dry before assembly to
snug the fit up a little if I can't find bedding compound..

"newby1493" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Quoted message said:

newby1493 said:

I have an old Shimano UN 71 Bottom bracket that I would like to
install. The original anti seize/damping compound that Shimano

uses

Quoted message said:

Quoted message said:

Quoted message said:

between the removable cup and the BB bearing has been removed and I
was wondering what the best replacemanet would be?

Bottom bracket creak has been a problem for me in the past and this
cup a looser than a slide fit. I have Paint, Locktite blue, grease
and teflon tape at my disposal. The cup seems loose enough for one
wrap of teflon tape but that seems likely to migrate in use. Don't
know if the locktite wouls fill the gap.

Shimano originally used some kind of guey tape on the inside of the
cup that I have heard works quite well. Any suggestions?

Unless I misundersatnd you, you're talking about the joint between

the

Quoted message said:

Quoted message said:

*inside* of the cup and the bb cartridge, not the *outside* of the

cup

Quoted message said:

Quoted message said:

and the frame's threads, right?

I've also noticed the goop Shimano puts in there, and I've also

wanted

Quoted message said:

Quoted message said:

to replace what's become displaced, but I don't know what it is

either.

Quoted message said:

Quoted message said:

I've heard others mentions bearing seating (or is it bedding?)

compound

Quoted message said:

Quoted message said:

or something similar, so I'd also want to hear what others might
recommend.

So far I've just put lots of greas in there and tightened it up. So

far

Quoted message said:

Quoted message said:

so good!

Yes, I was not clear in my post, My threads appear fine and they
don't move between reseatings. My guess is that the inside of the
adjustable cup causes the clicking. Shimano cups without that bedding
compound are a little loose and will rock. I might try a thin wrap
with epoxy around the bearing letting the epoxy dry before assembly to
snug the fit up a little if I can't find bedding compound..

It was gray rubbery material on my Shimano BB cartridges. I suggest that
you take your cartridge to a LBS that has a stock of Shimano BBs and see
if they will check the fit of a new plastic cup to make sure that your
old cup is not wallowed out. If it's damaged you may be able to get a
replacement plastic cup.

A few months ago I bought a new Shimano cartridge at a LBS. When I went
to install it I found the plastic cup was from a different BB cartridge
and fit loosely plus my BB tool didn't fit. It was a blue-gray color vs.
the gray or black plastic cups from my other Shimano BBs. I took it back
and was able to find the correct cup in their BB drawer.

Loctite and other brands of bearing mount compounds are anaerobic
plastic materials that harden in the absence of air after they have been
applied to the parts. Some of the material could remain uncured
indefinitely because of the splines in the cups. It could also react
with the plastic that the Shimano cups are made from.

Good luck,

Chas.