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Re: [TCML] nst



Hey Doug...

my first effort would be to find a new/other NST. Removing the tar is a long , messy, and tedious operation. but if you have no the option, the best procees found to date is to freeze the NST ( remove the case first) either chisel or ( last chioce) wackit with a hammer like object to break off the major portions of the tar ( and possible the outer windings of the secondary) THEN soak it in a solvent like diesel, mineral sprits ( very low flash point hydrocarbon) over several days to soften up the rest of the clingy stuff. Avoid gasoline.... too volitile and has a tendancy to remove the insulation on the wire...also stay away from the more agressive solvents like toluline, acetone, xylene,,, these will definately destroy the wires insulation.... once the majority of the tar has been removed, there is the "hot melt " process in which you fire up the BBQ pit and use INDIRECT heat to "melt" off the remaing tar ( opening up the BBQ pit to find your NST aflame is not a happy moment).... be sure to put the NST in one of those cheap throw away aluminum pans when doing this... if you dont you will never get rid of the "stink" that seems to permeate the BBQ pit when the tar drips into the bottom of the pit. Dont even consider the oven unless you want to get divorced....

Tar soaked NSTs were made to be perminately sealed ( and the Epoxy filled ARE PERMINATE ( Transco for example), unless you like dangerous exotic solvents)

best wishes and endevours

Scot D


douglas smith wrote:

can  anyone give me some advice on removeing tar from nst to remove coil
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