Brucey wrote:Trigger wrote:I'm still trying to fix up this Gazelle that I bought locally, it was only supposed to be a quick job and it has turned into a right pain in the 'arris
I eventually managed to get the crank off with the stripped thread but both bottom bracket lock rings are seized solid, cheater bars, hammer and cold chisel haven't shifted either of them yet. It's only going in the bin anyway so is destruction my best option? if so what's the best way of doing it without potentially damaging the frame?
IIRC provided you can unscrew the adjuster (LHS), the axle and bearings can be drifted out of the assembly in this model Mavic BB. At this stage you can either rebuild using new bearing parts (IIRC if the axle is good you can use parts from cartridge bearings) or you can cut the aluminium housing out of the frame.
Once the lockrings are off the main housing should just slide out of the frame. Too late now of course but IIRC the spindle is cross-drilled and the whole unit can be purged with grease using a grease gun. I would probably have greased it and used it for a while before trying to do anything with it; 'feeling gritty' is perfectly normal for cartridge bearings with the slightest corrosion in them, which might be terminal, but then again might not be, as revealed by further use.
Probably the threads in the frame are banjaxed anyway (which is why the Mavic BB was fitted in the first place; BTW it might be glued in place) so you will have another repair to do...
cheers
Well it's an ISO taper and I have Shimano stuff to go on it so wouldn't have been wise to reuse it I think. The lock rings are well dead, straight in the bin.
From what I can see it may just be that they're corroded in as there is a lot of white al oxide coming off when I wire brush the exposed threads, looks like its never been out to me. Can't shift either cup, tried a punch in one of the holes but it is just boring its way through the ally.
I wondered about making some flats on the cups and trying a big spanner?