Well T Bone is right.I would look hard for a used or new one.Then I would try and weld it with 7018.I just welded a cast iron pulley on a combine the other day with 7018.I veed it out,vise grip clamped a flat piece of metal on the other side,then heated with a torch kind of hot,burnt all the paint that was on it off,welded about an inch,peen,weld,peen,weld until it was finished,hit it with the torch again to where it was hot,walked away,a half hour later checked it for cracks,no cracks,no cracks the next day.
The way I told you is risky,it stands a chance of cracking,especially right beside where you weld,also in the case of your crack you need to drill a hole in the end of the crack as others said so it wont get longer.You would want to grind the top of the weld while its hot as well,I forgot to say that.When I was done with that pulley,welded in place on the combine,ground down,if you shot paint on it you wouldnt know it was there unless somebody told you.Ive done this a few times before and kind of have a feel for it.
On that case,it might be hard to hold it no matter what you weld it with.Cast iron is hard to really tell you how to weld,and very brittle.The thing is you want a good weld,dont mess around,you cant stop until you are done,and you stand a good chance it will break.T Bones method is probably the best and strongest of those mentioned here.You might want to think about taking it to a welder,but like I said to start with the best is a new or good used piece.
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