full blast on the cast with no effect. Then I got the plug red hot
and let
it cool. That and with the 6 foot cheater and beating with the BFH
and 15"
chisel finally broke it loose. The object of heating in this case is
to
break loose the corrosion bond.
I was after the thermal expansion effect, and I think I may even have
tried an ice cube in the center hole of the plug after heating. I
had to get the wrench on the plug _immediately_ after pulling off the
torch in order to get it to budge.
-- Jim
