On 2008-02-29, Don Young wrote:

"Ivan Vegvary" wrote in message
news:6FJxj.5993$tH.2093@trndny01...
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

mine is 13mm. 2007 Silverado Classic (really a 2006)

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.

Do you have a good wrench? (maybe 13mm)

Can you try putting it firmly on the bolt's head, and tapping on it
gently with a small hammer or some such, to get the bolt to start turning?

I suppose my best approach at this time would be to weld on a large nut
that will fit over the hex head.

kind of a dangerous thing to do when it is in a possibly aluminum
casing.

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.

Thanks,

Ivan Vegvary

I would strike the plug several times really hard on the face with a heavy
hammer to help loosen it and use a tight fitting six-point impact socket
with a strong and long pull handle. Grind the face of the socket if needed
to remove the bevel. Dress the hex on the plug if needed for a good fit.
Then press the socket tightly in place and pull. You will either remove the
plug or the center hex will twist off. I don't think welding on a nut would
be any stronger than the hex itself.

Don Young