My neighbor has a Dodge dually with a Cummins diesel in it. On the cylinder head there are a bunch of freeze plugs around the injectors (IIRC). One was way in the back in the transmission tunnel area. It would have to be that one that corroded through and started leaking. In order to replace it (the factory way), the head would have to have been pulled. He reamed out the freeze plug and threaded it for a 1/4" NPT plug. Then he put RTV rubber sealant on the threads of a plug and screwed it into place. This was last week. So far he hasn't had any problems with it. It was a PITA, and took him a day of lying across his engine in an uncomfortable position, but he managed it and probably saved at least a grand.
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