I have successfully and unsuccessfully brazed cracked castings before. If it was mine and had been running that way without leaking, I might just pretend I never saw it.  
If attempting to weld, if you can't preheat and then slow cool, you have a good chance of hearing a loud crack some minutes after welding.... BTDT
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Last edited by Tim Hancock; 07-23-2020 at 12:39 PM..
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