Crank Comming Loose.

[1337 Trials]

Hello. Recently I cracked a bottom bracket cup and I have the truativ howitzer external BB. I luckily have a spare cup/bearings at home so I swapped the cup/bearings over. However even though the cup should have fitted (so a few members said on various forums) the crank arm ended up sitting right against the BB cup. As a result my local bike store fitted a washer between the BB cup and the crank arm to fill the cap.

All of a sudden today my crank arm came loose so I tightened it (obvious thing). However it came lose again within 5-10 pedals. Im pretty sure nothing is rounded off. Im guessing lock-tight on the bolt won't fit this?

Thanks

EDIT:

Edited May 16, 2012 by 1337 Trials

[Jamie_Trials]

Sounds like your BB splines have worn or your crank, you could give lock-tight a go but it's doubtful that will sort it, best to replace it fast before it messes up other things.

EDIT: ORRRRRR maybe the thread for the crank bolt has gone?

Edited May 16, 2012 by Jamie_Trials

[1337 Trials]

Ile upload a picture shortly

EDIT:

Pictures are up

Edited May 16, 2012 by 1337 Trials

[Rockman]

Threads in your BB look shagged, take a closer picture and it will be easier to tell.

[1337 Trials]

Threads in your BB look shagged, take a closer picture and it will be easier to tell.

Ahh. I have a spare axel. Only problem for me is getting the drive side crank off. I was told to take the washer off as the crank is meant to sit next to the BB cup so ive done this but the bolt still comes loose within 5-10minutes of riding The bolt thread is fine. Only other thing is the thread within the axel.

Edited May 17, 2012 by 1337 Trials