un-brazing preheater flanges?

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un-brazing preheater flanges?

Post by Clyde on Sat Dec 19, 2009 9:09 pm

I have a new German muffler, and a new single port intake, and the preheat flange holes are off by 1/4" on the 1-2 side. I'm used to elongating the holes a bit to get the bolts to fit, but this time it's off the map. The hole would need to become a slot exiting the side of the flange (don't want to butcher it completely).

The flange is brazed on the tube. Can I heat it enough to loosen the braze and remove the flange, for repositioning? Anyone ever un-braze something successfully?

thanks,
Clyde
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Re: un-brazing preheater flanges?

Post by 71_georgia_beetle on Sun Dec 20, 2009 12:36 am

You can but keep the heat moving. Heat the male part first. You can break the flux skim with a screwdriver to start the change from solid to liquid. You will need an oxygen acetylene torch. Propane and Map gas will not burn hot enough.
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Re: un-brazing preheater flanges?

Post by Clyde on Sun Dec 20, 2009 6:55 am

Thanks Scott. You answered the question I didn't bother to type. Looks like I'll be end milling slots in this thing, 'cause all I have is propane.
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Re: un-brazing preheater flanges?

Post by Hobug on Sun Dec 20, 2009 1:47 pm

Clyde wrote:'cause all I have is propane.

Hank Hill would be proud. Laughing
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Re: un-brazing preheater flanges?

Post by fluxcap on Sun Dec 20, 2009 7:03 pm

Hobug wrote:
Clyde wrote:'cause all I have is propane.

Hank Hill would be proud. Laughing

Hahahaha Laughing

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