Bottom Bracket problem

Brian Drury said:

On the way home Fri evening there was some obvious movement in the
right crank. When I checked the bolt today it was tight so I removed
the crank and found this:http://www.flickr.com/photo_zoom.gne?id=2223198568&size=l

In case it is not obvious the shaft is now in two pieces!

I need a gizmo for removing the BB. Wiggle have this thing:http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=536001647...
which apears to have the correct number of splines.

Can somebody please advise is that the tool I need and what
replacement BB should I get. The bike is a very tired old hybrid that
has survived over 50000 mile and only needs to keep going until Aug
which is when my commuting will come to an end.

It will be fine and will fit a socket wrench of the right size.
Alternatively get
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=4000000799&N=Shimano%20Bottom%20Bracket%20Removal%20Tool
for a tenner less and use a big spanner.

Quoted message said:

Advance thanks to anyone who can help - this is unfamiliar territory
for me.

Oh, and is this a common problem?

Like that? never seen one before.

...d

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

Quoted message said:

On the way home Fri evening there was some obvious movement in the
right crank. When I checked the bolt today it was tight so I removed
the crank and found this:
http://www.flickr.com/photo_zoom.gne?id=2223198568&size=l

In case it is not obvious the shaft is now in two pieces!

I need a gizmo for removing the BB. Wiggle have this thing:
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360016479&n=Shimano%20Bottom%20Bracket%20Cup%20Installation%20Tool
which apears to have the correct number of splines.

Can somebody please advise is that the tool I need and what
replacement BB should I get. The bike is a very tired old hybrid that
has survived over 50000 mile and only needs to keep going until Aug
which is when my commuting will come to an end.

Advance thanks to anyone who can help - this is unfamiliar territory
for me.

Oh, and is this a common problem?

Snapped BB shaft? Happens, but rarely.

On the photo, the circular bit behind the shaft (the shiny bit, and not the
one outside the splines) is showing a fair amount of damage - any idea how
that happened?

Re the tool :
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360031492
seems to be a fair bit cheaper than the shimano one. Or there's a cheaper
shimano one too. Though the one you mentioned does appear to have a socket
(1/2" at a guess) which could be more useful to you than a bit spanner
fitting (is to me).

Ah - http://www.chainreactioncycles.com/Models.aspx?ModelID=680

might be worth a look. It's what I'd get. Remember the chainwheel side is LH
threaded.

For a new BB, I'd just get a shimano un-50something (53 or 54). You'll need
to work out which length you need - width of your BB (probably 68mm), and
length of the shaft. 2 quid cheaper at chain reaction than wiggle, and free
post too :-)

cheers,
clive

cheers,
clive

Brian Drury said:

Advance thanks to anyone who can help - this is unfamiliar territory
for me.

OK, others have given good advice regarding tools and new BB.

When you remove the old one it's very likely that the Left side has a
right hand thread and the right side a left hand thread.

Quoted message said:

Oh, and is this a common problem?

Not seen that one before. Well done.

--

Tim

I understand very little of what's being discussed
but for some reason it's fascinating.

(Jon Thompson, urs)

Clive George said:

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

Quoted message said:

On the way home Fri evening there was some obvious movement in the
right crank. When I checked the bolt today it was tight so I removed
the crank and found this:
http://www.flickr.com/photo_zoom.gne?id=2223198568&size=l

In case it is not obvious the shaft is now in two pieces!

I need a gizmo for removing the BB. Wiggle have this thing:
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360016479&n=Shimano%20Bottom%20Bracket%20Cup%20Installation%20Tool
which apears to have the correct number of splines.

Can somebody please advise is that the tool I need and what
replacement BB should I get. The bike is a very tired old hybrid that
has survived over 50000 mile and only needs to keep going until Aug
which is when my commuting will come to an end.

Advance thanks to anyone who can help - this is unfamiliar territory
for me.

Oh, and is this a common problem?

Snapped BB shaft? Happens, but rarely.

On the photo, the circular bit behind the shaft (the shiny bit, and not the
one outside the splines) is showing a fair amount of damage - any idea how
that happened?

Re the tool :
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360031492
seems to be a fair bit cheaper than the shimano one. Or there's a cheaper
shimano one too. Though the one you mentioned does appear to have a socket
(1/2" at a guess) which could be more useful to you than a bit spanner
fitting (is to me).

Ah - http://www.chainreactioncycles.com/Models.aspx?ModelID=680

might be worth a look. It's what I'd get. Remember the chainwheel side is LH
threaded.

For a new BB, I'd just get a shimano un-50something (53 or 54). You'll need
to work out which length you need - width of your BB (probably 68mm), and
length of the shaft. 2 quid cheaper at chain reaction than wiggle, and free
post too :-)

cheers,
clive

cheers,
clive

Thanks for the info'

I have ordered a tool, one with a big handle, I think this will be a
struggle to get off even if I turn it in the correct direction 🙂 The
width of the BB is indeed 68mm so all I need to know now is the length
of the shaft. Problem is I can't remove the left crank, it's well and
truly stuck. (I tried heat - lots of heat) I need to remove the whole
assembly and put it in the vice then I can give it a bit of extra
encouragement.

I tried measuring the shaft by poking a bolt down the hole in the
crank and then put the vernier over the bolt and with the broken bit
of shaft held in place I get a measurement of about 115mm after
subtracting the bolt length. This leads me to:
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360027179&N=Shimano%20UN54%20Tapered%20Bottom%20Bracket

Where we see that the 68 X 115mm is out of stock but what does the BS
stand for? Also if I buy the 113mm which is in stock could the
difference be taken up by adjusting the front mech? The 113mm is BS
and triple - I have a triple chain set what is the 115mm then?

Cheers Brian

Brian Drury said:

Thanks for the info'

I have ordered a tool, one with a big handle, I think this will be a
struggle to get off even if I turn it in the correct direction 🙂 The
width of the BB is indeed 68mm so all I need to know now is the length
of the shaft. Problem is I can't remove the left crank, it's well and
truly stuck. (I tried heat - lots of heat) I need to remove the whole
assembly and put it in the vice then I can give it a bit of extra
encouragement.

Hmm. removing the whole assembly without being able to get the tool to
the splines might be a bit of a challenge.

Try Plus Gas (tm) and leave it for 24 hours. WD40 and similar things
are not the same.

If it is really really stuck, you could hack saw through the axle, as
the BB is stuffed anyway.

Quoted message said:

I tried measuring the shaft by poking a bolt down the hole in the
crank and then put the vernier over the bolt and with the broken bit
of shaft held in place I get a measurement of about 115mm after
subtracting the bolt length. This leads me to:
http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360027179&N=Shimano%20UN54%20Tapered%20Bottom%20Bracket

Alternatively, when you have the old BB out, you should find a label
on it, with the dimensions.

Quoted message said:

Where we see that the 68 X 115mm is out of stock but what does the BS
stand for?

At a guess British Standard (thread). That page also lists IT for
Italian thread, which is a different pitch and has both cups with a
right hand thread.

Quoted message said:

Also if I buy the 113mm which is in stock could the
difference be taken up by adjusting the front mech?

My experience hasbeen that Shimano BBs are symmetrical, so from 113mm
to 115mm only adds 1mm either side. Try adjusting your front mech
with the existing BB in place to see if you can bring it in by 1mm.

Quoted message said:

The 113mm is BS
and triple - I have a triple chain set what is the 115mm then?

Just another axle length. Different chain sets have different axle
length requirements.

--

Tim

I understand very little of what's being discussed
but for some reason it's fascinating.

(Jon Thompson, urs)

In article <[email hidden]>, Brian Drury
[email hidden] says...

Quoted message said:

Problem is I can't remove the left crank, it's well and
truly stuck. (I tried heat - lots of heat) I need to remove the whole
assembly and put it in the vice then I can give it a bit of extra
encouragement.

Have you tried using a crank extractor, or are you just applying brute
force and ignorance? :-)

I too am in the process of removing a worn out BB (30000 miles so no
complaints there) and I have a BB remover but it only seems to fit the
metal side of the new BB and the old one but not the plastic side, not
even close......
The plastic sleeve on the other side doesn't need a different tool
does it? Not seen anything like that mentioned.

Robert

BigRab said:

I too am in the process of removing a worn out BB (30000 miles so no
complaints there) and I have a BB remover but it only seems to fit the
metal side of the new BB and the old one but not the plastic side, not
even close......
The plastic sleeve on the other side doesn't need a different tool
does it? Not seen anything like that mentioned.

Possibly needs different tool (or brute force and big vice). There are a
lot of different bottom bracket tools; the Shimano pattern is perhaps the
most common. Campag (now old taper type) have a different one. I expect TA
are different again. etc...

If just removing old parts which will need a special tool, if its possible
to grip the BB in a vice and turn the frame round (remembering which side
has RH and LH threads).

- Nigel

--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/

"BigRab" <[email hidden]> a écrit:

Quoted message said:

I too am in the process of removing a worn out BB (30000
miles so no complaints there) and I have a BB remover
but it only seems to fit the metal side of the new BB and
the old one but not the plastic side, not even close......

Quoted message said:

The plastic sleeve on the other side doesn't need a
different tool does it? Not seen anything like that mentioned.

Assuming you're talking about a Shimano-type splined tool, sometimes the
plastic cup can become compressed on installation. A tap or two from a
mallet will usually get the tool to engage.

James Thomson

On Mon, 28 Jan 2008 03:18:00 -0000, Rob Morley <[email hidden]>

Quoted message said:

In article <[email hidden]>, Brian Drury
[email hidden] says...

Quoted message said:

Problem is I can't remove the left crank, it's well and
truly stuck. (I tried heat - lots of heat) I need to remove the whole
assembly and put it in the vice then I can give it a bit of extra
encouragement.

Have you tried using a crank extractor, or are you just applying brute
force and ignorance? :-)

Ah - point taken! A crank extractor is on its way (how did you know?)

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

Quoted message said:

On Mon, 28 Jan 2008 03:18:00 -0000, Rob Morley <[email hidden]>

Quoted message said:

In article <[email hidden]>, Brian Drury
[email hidden] says...

Quoted message said:

Problem is I can't remove the left crank, it's well and
truly stuck. (I tried heat - lots of heat) I need to remove the whole
assembly and put it in the vice then I can give it a bit of extra
encouragement.

Have you tried using a crank extractor, or are you just applying brute
force and ignorance? :-)

Ah - point taken! A crank extractor is on its way (how did you know?)

Ah - does that explain the marks I was asking about?

How were you applying the brute force and ignorance?

cheers,
clive

Clive George said:

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

Quoted message said:

On Mon, 28 Jan 2008 03:18:00 -0000, Rob Morley <[email hidden]>

Quoted message said:

In article <[email hidden]>, Brian Drury
[email hidden] says...
> Problem is I can't remove the left crank, it's well and
> truly stuck. (I tried heat - lots of heat) I need to remove the whole
> assembly and put it in the vice then I can give it a bit of extra
> encouragement.
>
Have you tried using a crank extractor, or are you just applying brute
force and ignorance? :-)

Ah - point taken! A crank extractor is on its way (how did you know?)

Ah - does that explain the marks I was asking about?

How were you applying the brute force and ignorance?

cheers,
clive

Oh dear! it's getting embarrasing now. I thought that as the crank was
so loose relative to the left crank it must be easy to get off once
the bolt was removed. Just ease it off with a big screwdriver.

Ok a bigger screwdriver. Then a big cold chisel. Then chisel and
hammer. Then chisel and club hammer..... you know the rest.

Brian

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

Quoted message said:

Oh dear! it's getting embarrasing now. I thought that as the crank was
so loose relative to the left crank it must be easy to get off once
the bolt was removed. Just ease it off with a big screwdriver.

Ok a bigger screwdriver. Then a big cold chisel. Then chisel and
hammer. Then chisel and club hammer..... you know the rest.

Mmm - would this explain the bust shaft then? :-)

FWIW if you've knackered the pulling threads, and can afford a BB more than
the cranks, a cutting blade on an angle grinder works well - I found a 9"
one was required to get the clearance. Requires sufficient space between the
crank and the BB though. Having done that, knock the stub out of the cranks,
and set to the BB with conventional tools.

cheers,
clive

In article <[email hidden]>, Brian Drury
[email hidden] says...

Quoted message said:

On Mon, 28 Jan 2008 03:18:00 -0000, Rob Morley <[email hidden]>

Quoted message said:

In article <[email hidden]>, Brian Drury
[email hidden] says...

Quoted message said:

Problem is I can't remove the left crank, it's well and
truly stuck. (I tried heat - lots of heat) I need to remove the whole
assembly and put it in the vice then I can give it a bit of extra
encouragement.

Have you tried using a crank extractor, or are you just applying brute
force and ignorance? :-)

Ah - point taken! A crank extractor is on its way (how did you know?)

You didn't mention knackered extractor threads. :-)
FWIW I'm pretty handy with the brute force and ignorance myself - either
knocking the axle through if the bottom bracket is loose, or prying the
crank off (a fork-type balljoint splitter can work well) although you
can also make or adapt a puller that goes around the back of the crank
rather than using the extractor threads. And there's always the
hacksaw/angle grinder/oxy-acetylene route ...