Removing crancks

[Manonabike]

I have a bit of a problem removing the cranks on one of my bikes. I cannot attach a crank puller as the threads on the crank has been badly damaged by rust - I had a few attempts and all I managed to do was to remove whatever threads where there.....

It's looking like I will have to cut off the crank from the BB axle unless somebody here can suggest an alternative method.

 

[battered]

I would clean up the threads with a thread file if possible. These are available from engineering suppliers. Alternatively you can probably get a balljoint splitter tool from a car maintenance shop (or local mechanic) which I've used in the past, or a small 3 leg puller.

 

[stavros]

Go to the gym and get some muscles!

 

[Manonabike]

Hardly any threads left, they just disintegrated....never seen anything like it ...

The other two suggestions are good.... will look into it. Thanks

 

[PatrickPending]

remove the bolt and go for a ride - with any luck it'll loosen it!

 

[Matthames]

Another way of getting things moving would be the use of some penetrating oil and a hammer. Giving it a bit of a whack will break the bonds between the metal and get things going.

 

[fido]

When I had the same problem I heated the crank arm over the gas hob and then tapped it off with a rubber mallet.

 

[Globalti]

When I had the same problem I heated the crank arm over the gas hob and then tapped it off with a rubber mallet.

A plumber's blow torch would be more focussed. Penetrating oil is a waste of time. Best advice is to remove the bolt and go round the block.