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Old 07-14-2012, 08:30 AM   #1
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Default FM lower down pipe problem

I recently removed my FM turbo and lower down pipe from my car, I noticed that the flange weld on the lower down pipe had split (the 4 bold flange that attaches to the cast upper down pipe).

I have had it welded but when input a straight edge across the flange it is not perfectly flat, I assume it was before I had it welded. What is my best option:

Try to grind/ file the flange flat
Try to find a gasket to fit (I'm in the UK and can't seem to find one)
Buy a new lower down pipe?

Any advice would be welcome.....

Barry
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Old 07-14-2012, 09:22 AM   #2
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Grind it flat.
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Old 07-14-2012, 10:45 AM   #3
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use Copper RTV and make your own gasket...after you've tried to beltsand the flange flat.
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Old 07-14-2012, 11:12 AM   #4
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bolt it together as is and see if the tick-tick exhaust leak bothers you. If so, then do what is said above.
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Old 07-14-2012, 12:16 PM   #5
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Cheers guys, I have just had a go at draw filing it in different directions and it is taking away the hig spot in the middle so I think that will work.

I have some MAG RTV red (650 degrees F) will that suffice?

Thanks again for the replies.....

Barry
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Old 07-14-2012, 12:32 PM   #6
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yeah, copper ultra is rated at 700F; that's what i use.
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Old 07-16-2012, 11:13 AM   #7
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That pipe is going to get WAY hotter then 700*, don't know of anything that well last in that spot. Needs to mate up tight flange to flange.
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Old 07-16-2012, 02:28 PM   #8
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I'm using that stuff on my cat. it's fine bro. dont knock it till youve tried it.
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Old 07-16-2012, 02:49 PM   #9
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Get some sand paper, put it on a flat surface and just grind away. It will take some time but most people dont have a big flat wheel or a surface grinder.





You get the point.
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Old 07-16-2012, 02:59 PM   #10
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Had my down pipe crack all the way through there. My replacement downpipe from FM had a slight dome; right over the little braces on the sides. Just sand it down. I mounted mine in a vise and used an orbital sander for most of it.
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Old 07-16-2012, 03:09 PM   #11
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First off I ain't your bro, second I wasn't knocking anything. If the temp is good to 700* it ain't going to hold up at the temp that down pipe gets to bro. Copper ultra is mainly for head gaskets.
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Old 07-16-2012, 03:16 PM   #12
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but it will, and does. Would I use it on the turbo, hell no. anywhere else on the exhaust, hell yes.
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Old 07-27-2012, 03:07 AM   #13
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Just to close this thread, I tried most things to get this flat but in the end I took it to a fabricator to get it milled flat. Due to the shape of the flange it couldn't be gripped securely in the vice so he tac welded a lump of box steel to the exhaust - job done

Cost me 15 ($10 ish)



Thanks for all the advice though.

Barry
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