there should be no problem with running the alt as it is. as for long term i would first stop drill the crack( drill a small hole on the end of the crack) then put jb weld over the crack. i am not sure that jb weld would do any thing by it self unless you could completely fill the crack
I would return it, you have yet to install it and the place did not pack it well or failed t see it was damaged. To fix pot metal like that is not worth it and jb weld is not going to help
I saw that same, its hard to fix something like that and trust it. All the heat under the hood and all the stress its under with the RPMs and soforth...
That is by far the worst packing I have seen. The alt will probably ok if you put some filler in the crack like JB or something but jesus, what a shitty packing job.
If i could just return it i would. I bought it off the forum here. I dont think a manufacture would ship their alt like this. There is another big dent on the back of the casing. One of the terminals is bent as you can see in this picture. PITA im telling you.