Dented Bottom Bracket, how to fix?

[skillsthebarber]

I have a frame that I dropped and it flattened out part of the BB. Im not sure how to make it round again. I started to use a hammer but I could tell it was going to gouge the inner wall of the bb. Any help would be appreciated

 

[A.S.BOLTNUT]

you must of had the barring cup out at the time too bend it so easily ? if so i would just tap the cup back in with a small mallit,place a scrap piece of wood over it so not to damage the cup.should work.

 

[CCR]

like A.S. says, just tap it back out if you need too and then try to put a bearing cup back in it. sometimes it helps to use something to tap on like a socket extension or something similar so your not beating the straight part of the bb up.

happens all the time to steering tubes "dropped" in shipping

 

[scrumblero]

if you have a piece of gas pipe lay it in the bottom of the hole and beat on that

 

[mikesbikes36]

freeze the bearing cups and beat em back in with a wood block ??? never done it but sounds like it would work ...LOL

 

[deorman]

Your auto/industrial tool store might have a wedge-type swaging tool big enough to snug in there for an anvil. :|

 

[SimpleMan]

I'd try driving the bearing cups into it if it isn't too bad. If you have a muffler shop close by they have a hydraulic tool they use for sizing pipe. If they use caution this should make it round again. They also have a coned shape tool they use to drive into the end of a pipe when it gets dropped to make the opening round again. I wouldn't think they would charge much for this.

 

[skillsthebarber]

i wasnt really bad, I used a round part of a hammer and hit it with another happer to mare it more round. after that the bearing cups went in really nice. Thanks Guys for all the help.

 

[c.p.odom]

Freezing the bearing cups is only good for an interference fit of about 5 thou. Brute force will be needed. Pound it out with a round headed object, when it is close press in an old cup using an arbor press or a 6inch vise, this should press it out. A little heat won't hurt either.