help removing seized bolts

[losidan]

Hi,

one of the bolts into the bb axle on my cranks is seized in...I cant get the begger out and I was wondering what methods anyone else uses to get a seized bolt out?

any help much appreciated

[meticulous]

you can try the wd40 or heating it up method, sometimes the shock from a sharp bang with a lump hammer, :daumenhoch:last resort try to cut off with a dremel

[lodge]

Is it sheared/rounded or just wont budge?

[losidan]

it just wont budge mate...it is starting to get a little rounded is the hex too so i dont want to do it too much in case i knack it completely.

[MartyC]

Get a flat punch and give it a good whack with a hammer on the centre of the bolt to break the "weld" whre the two metals have seized if that fails get some diesel and pour it in and leave for a few days to soak before trying the punch again and then the right sized socket wrench  .

Marty 

[oberonspacefruit]

liquid wrench dimantling spray, marketed as plusgas in the uk.

[2020mad]

soak a rag in coke (not cheap crap) wrap around bolt and make sure its well soaked and leave on until morning. 

[Goose1]

Get a flat punch and give it a good whack with a hammer on the centre of the bolt to break the "weld" whre the two metals have seized if that fails get some diesel and pour it in and leave for a few days to soak before trying the punch again and then the right sized socket wrench  .

Marty 

Or try and give it a little tighten and then undo.

[AxlFoley]

I was about to say that

[lazychubs]

or get a socket that use the whole nut to undo and not just the edges
has a special name but im a tad drunkerd tonight
and cant remember it lol

[vdubferret]

Diesel! 

[TwoBobRob]

All of the above.  I think Lazychubs is on about a flank drive socket. You want to be using a six sided socket rather than a twelve anyway as they will handle/transmit more force.

Try an impact driver too. They're very effective if used properly. You deffo want a six sided socket for that though   

Last resort is to snap the head off completely (that allows you to dismantle everything) then drill the remains of the bolt out of the axle as a little job in a vice.