flatboat said:
oh my ,thats what i did wrong , i didn't weld em . now i know why they leak . uh oh .thats chrome , don't you have to preheat that to stop it from cracking ?
It's actually a chrome plating on mild steel, which does not require a preheat, especially for a small tack weld with a MIG.
how do you keep the grease in if the seals are burnt from all that preheat.
You wrap around the outside of it with a wet rag, except for the spot you're about to tack weld, and you stuff a wet rag into the face of the BB. Again, a quick tack weld isn't putting off a lot of heat, and if you wrap with wet rags, it keeps the heat from damaging anything.
then what about the heat to stress relieve it .
Again, it's not pure chromium, nor chrome moly steel, so it does not require preheat or stress relieving.
i'm so confused .can't they make them out of rubber , kinda like a condom . you fill up wth grease and it keeps a little pressure on it.
No, what they should do is cut internal threads into the face of the hub, and external threads on the BB, so the BB simply threads into the hub, instead of trying to press-fit it.
Either that, or drill and tap about 1/4" from the edge of the hub, for setscrews to hold a BB in place, put 3 of them at 120 degrees apart, around the circumference. That would also work.