Jon Elson wrote:

Ivan Vegvary wrote:

First time ever I had my oil changed by others, they bungled the drain
plug. 2000 Chevy Silverado. It was out of town and too far away to
consider redress.

The plug is either 14mm or 9/16 inch hex head. The head seems to have
a slight taper to it. The rest of the plug is an approximate 1.5 inch
shoulder probably with a gasket. I already tried moving it by
chiseling near the edge.

I suppose my best approach at this time would be to weld on a large
nut that will fit over the hex head. I'll be using wire feed welder.
Other than disconnecting the car battery, is there any other advise
before I weld? This will be my first ever overhead weld.

Drain the oil first. Oh, that might be hard. Somebody had a bit on the
net about working on a Delorean or something, and they dented the oil
pan. So, they welded a nut on the pan to pull it out, but that caused
an oil/gas vapor explosion inside the crankcase and blew off both rocker
arm covers! So, heating the outside of the pan might not be such a good
idea. No way could you weld it with gallons of water inside the pan, I
don't know about oil, but I suspect it will be very hard to get it hot
enough to weld without boiling a huge amount of oil on the inside.

Jon

Did it take the dent out of the pan?