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Removing brass threads from cast iron tapped hole

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Geoff

04-21-2002 20:26:25




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I have Zenith carb that I am rebuilding. The float valve seat was stuck good and after buggering up the slotted head, I drilled out most of the remaining brass of the float seat. Usually when I do this it is no problem to remove the remaining threads, but not in this case! The threads are glued in place with varnish or something. I've tried picks with minimal success. Anybody have any solutions?

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Alberta Mike

04-23-2002 07:04:45




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 Re: Removing brass threads from cast iron tapped hole in reply to Geoff, 04-21-2002 20:26:25  
Not that this will help you with your current problem, but I went through the same thing a number of times trying (unsuccessfully) to get that fitting out. I went to an auto parts store and bought an inexpensive HUGE screwdriver with the biggest slothead end I could find. I cut the end off a bit until the width was the same as those fitting slots, then filed it down a bit in thickness so that when the blade dropped into the fitting, it was a perfect tight fit in all directions. Man, what a difference that made, you could even wrench on it with a wrench or vicegrip, etc. The screwdriver is useless for anything else except that one job. And, heating the fitting and surrounding area with a propane handtorch before trying to get that (or any other) brass part out also does wonders. Good luck with the current fix.

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wrenchman

04-22-2002 01:08:39




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 Re: Removing brass threads from cast iron tapped hole in reply to Geoff, 04-21-2002 20:26:25  
you might be able to melt em out with a oxy/acty torch with a small(#0)welding tip.have done this before with pretty good results.you just need to run a tap in after to finish cleanout...just don't overheat the part...might set it in a shallow pan of water if really worried...



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Jeremy

04-22-2002 00:41:16




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 Re: Removing brass threads from cast iron tapped hole in reply to Geoff, 04-21-2002 20:26:25  
If you can pick out the brass at the beginning of the threads so you can see where they start, you might be able to get a tap in there to clean out the threads. Be very careful if the carb is made out of aluminum or pot metal. It won't take much to mess the hole up.



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