Bb stuck
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Nant



Joined: 16 Oct 2012
Posts: 241

PostPosted: Wed Feb 03, 2016 7:01 pm    Post subject: Bb stuck Reply with quote

I've got a old style square taper bb in the bike. It's admittedly been there for a couple of years and I've not even touched it. Recently it's gone all crunchy and it's not the pedals.

So I've taken crank arms off but I can't even budge the bottom bracket. I've the tools and it's not budging at all.

I even tried shouting profanity at it alas that did nothing.

Any helpful solutions?

Thanks
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Gunner



Joined: 15 Apr 2007
Posts: 29326
Location: Under Whitestone-Cliffe on the Lake.

PostPosted: Wed Feb 03, 2016 8:39 pm    Post subject: Reply with quote

You could try extending the length of the spanner by slipping something like a length of pipe over it to give you more leverage..................
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Attila



Joined: 15 May 2015
Posts: 417
Location: Forest of Dean

PostPosted: Wed Feb 03, 2016 9:02 pm    Post subject: Reply with quote

Give it a good soaking in wd40 and leave it for a while.

Check the new one to make sure it's not a reverse thread...

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Threevok



Joined: 30 Jul 2012
Posts: 2141
Location: South Wales Valleys

PostPosted: Thu Feb 04, 2016 5:14 pm    Post subject: Reply with quote

Is one side made of plastic ?

to get the one out of my GT, I had to smash the plastic side out with a hammer and chisel - before I could budge the other side

You probably know this but also to remember is that one side is a left hand thread. Make sure you are loosening in the right direction

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Steve Kish



Joined: 06 Jan 2009
Posts: 8032
Location: Near Heathrow

PostPosted: Thu Feb 04, 2016 9:34 pm    Post subject: Reply with quote

Good avice but if the WD40 fails, try using Plus-Gas as this is actually a freeing agent rather than WD40 which is a water displacement agent but does offer certain limited properties in freeing and lubricating.
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Robmet



Joined: 04 Jan 2010
Posts: 1892

PostPosted: Fri Feb 05, 2016 9:49 am    Post subject: Reply with quote

As Steve says its better to use an actual penetrating fluid, plus gas is good and iv been using RP-90 recently which is also very good.

If you dont already have a small hole under your bb shell then drill one in, 3-4mm is enough. Then its best to lay your frame over and squirt plenty of fluid in through the hole so it has a chance to use gravity and seep down through the threads. Leave it overnight if you can to soak.

If you have the space its best to hold the bike horizontal in a sturdy vice, make sure the tool is securely fixed to the bb, you can normally use the crank bolt through the tool to stop it slipping, then its a case of finding as much leverage as you can put on it.

Repeat the overnight soaking and try again if its still stuck, most things will come out first time but if its really stuck it could take another round.

Use heat as a last, especially on aluminium frames as some of them are heat treated and this can weaken them, steel is fine but either way you are then looking at a paint job on top.
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Nant



Joined: 16 Oct 2012
Posts: 241

PostPosted: Thu Feb 18, 2016 12:18 am    Post subject: Reply with quote

Thanks for your replies. I did use the plus gas and left horizontal for a couple of days. Still absolutely solid. Laughing It's a steel ragley frame. So maybe heat is the next option. Or ask a lbs.
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