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#1
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Catalytic Converter Threads Too Tight
I just bought a new "direct replacement" catalytic converter for my
Daihatsu. A thing that surprises me is that the bottom threaded holes are slightly small in diameter. It doesn't seem to be the "wrong" size. It should be 10mm x 1.25. The thread pitch looks right, and the diameter is clearly closer to 10mm than to 9 or ll. But it's just so tight that the studs won't even get started. I could go buy a tap and cut the threads again, but I have to wonder whether that's the right thing to do. Are the threads done this way for a reason? Is there a procedure for expanding the flange with heat before installing the studs? I wouldn't want to do the wrong thing and have my headpipe fall off while driving. Your advice is appreciated. |
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#2
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On Fri, 24 Dec 2004, Blake wrote:
> I just bought a new "direct replacement" catalytic converter for my > Daihatsu. A thing that surprises me is that the bottom threaded holes > are slightly small in diameter. Are you the same guy who was on here a coupla months ago wondering why the converter was empty? > It doesn't seem to be the "wrong" size. It should be 10mm x 1.25. The > thread pitch looks right, and the diameter is clearly closer to 10mm > than to 9 or ll. But it's just so tight that the studs won't even get > started. Have you considered the possibility your studs are slightly too large? |
#3
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That kinda sounds like a standard to metric thread issue....
Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Blake wrote: > > I just bought a new "direct replacement" catalytic converter for my > Daihatsu. A thing that surprises me is that the bottom threaded holes are > slightly small in diameter. > > It doesn't seem to be the "wrong" size. It should be 10mm x 1.25. The thread > pitch looks right, and the diameter is clearly closer to 10mm than to 9 or > ll. But it's just so tight that the studs won't even get started. > > I could go buy a tap and cut the threads again, but I have to wonder whether > that's the right thing to do. Are the threads done this way for a reason? Is > there a procedure for expanding the flange with heat before installing the > studs? I wouldn't want to do the wrong thing and have my headpipe fall off > while driving. > > Your advice is appreciated. |
#4
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Drill out the threads, nut & bolt 'em, have a nice day. Aren't there
any REAL mechanics out there anymore??? |
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