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Hi John,
   It doesn't sound good. If that plug was in there stiff enough to break off during removal that threaded stub tube could be a real problem to get out. Hopefully it was because of rust and not that it was cross-threaded in previously. Try heating the area with a propane torch then use some penetrating oil, you may have to do this several different times allowing time for the penetrating oil to soak in.
   The next thing you could try is to cut a trench or two in the tube with a Dremel tool and ball mill, hopefully you could somehow vacuum or blow the metal filings out of the cylinder afterward. You would have to be careful not to cut into the threads, but, at this point I'm wondering how healthy they are anyway.
   The worst case scenario is that you have to pull the head, drill out the plug remains probably taking the plug threads with it, then you will have to install a helicoil.

justa thought,
   G.B.

<blockquote data-quote="geo46er" data-source="post: 6114" data-attributes="member: 177">Hi John,&nbsp; &nbsp;&nbsp; It doesn&#039;t sound good. If that plug was in there stiff enough to break off during removal that threaded stub tube could be a real problem to get out. Hopefully it was because of rust and not that it was cross-threaded in previously. Try heating the area with a propane torch then use some penetrating oil, you may have to do this several different times allowing time for the penetrating oil to soak in.&nbsp; &nbsp;&nbsp; The next thing you could try is to cut a trench or two in the tube with a Dremel tool and ball mill, hopefully you could somehow vacuum or blow the metal filings out of the cylinder afterward. You would have to be careful not to cut into the threads, but, at this point I&#039;m wondering how healthy they are anyway.&nbsp; &nbsp;&nbsp; The worst case scenario is that you have to pull the head, drill out the plug remains probably taking the plug threads with it, then you will have to install a helicoil.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; justa thought,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; G.B.</blockquote>

[QUOTE="geo46er, post: 6114, member: 177"] Hi John, It doesn't sound good. If that plug was in there stiff enough to break off during removal that threaded stub tube could be a real problem to get out. Hopefully it was because of rust and not that it was cross-threaded in previously. Try heating the area with a propane torch then use some penetrating oil, you may have to do this several different times allowing time for the penetrating oil to soak in. The next thing you could try is to cut a trench or two in the tube with a Dremel tool and ball mill, hopefully you could somehow vacuum or blow the metal filings out of the cylinder afterward. You would have to be careful not to cut into the threads, but, at this point I'm wondering how healthy they are anyway. The worst case scenario is that you have to pull the head, drill out the plug remains probably taking the plug threads with it, then you will have to install a helicoil. justa thought, G.B. [/QUOTE]

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