Which exhaust clamps...

Discussion in 'E46 M3 (2001-2006)' started by svvg, Jan 19, 2020.

  1. 19 Jan 2020 at 2:33 PM #1
    svvg

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    Exhaust clamps on my back box have finally fallen off... and i can’t remember what the best replacement set is - these ones:

    https://x8r.co.uk/exhaust-flange-muffler-back-box-repair-kit-for-bmw-e46-m3

    Folk used to fit Peugeot clamps - but I think with mixed results?

    I have an ac schnitzer back box on standard centre section. Doesn’t look like it’s blowing - so wasn’t planning on separating the pipes in order to fit the clamps?

    Grateful for a point in the right direction. Many thanks!
     
  2. 19 Jan 2020 at 3:33 PM #2
    jafbash786

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  3. 19 Jan 2020 at 5:33 PM #3
    svvg

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    Thanks for this - do they open up/split - and hence no need to separate the pipes?
     
  4. 19 Jan 2020 at 8:59 PM #4
    M3 R0B

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    They come in 2 halves so dont need to split the pipes, you can get them for 25 off ebay, or 40 from hack engineering
     
  5. 19 Jan 2020 at 9:00 PM #5
    M3 R0B

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  6. 19 Jan 2020 at 10:50 PM #6
    svvg

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    Great. Thanks for this!
     
  7. 20 Jan 2020 at 5:43 PM #7
    M3Chas

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    One thing to bear in mind is you'll need a set of exhaust gaskets, which will drive the price difference down somewhat ; the X8R kit comes with these. This may sway your decision when going for either kit. A friend has an unused X8R kit if you are interested. I can ask him for a price or give you his contact details.

    Another thing, the Peugeot clamps don't clamp the exhaust correctly and if overtightened can damage/crack the exhaust ; the flares are too small for the clamp to work effectively. In short:

    • Inner pipe : two clamps bring together the exhaust with an olive gasket in the middle to secure it
    • Outer pipe : The clamp doesn't seem to actually clamp the exhaust. All it does is bring the wire/mesh-like seal into the flare joint so as to make the seal.
    The X8R video shows this quite well:

     
  8. 20 Jan 2020 at 6:26 PM #8
    R60BBA

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  9. 20 Jan 2020 at 7:15 PM #9
    svvg

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    Thanks so much for the links guys. I went with an ebay kit which looks like the above - but with no gaskets.... am hoping not to have to separate the pipes, so hopefully the existing seals will remain from the old gaskets - so will fit and see if I have any soot showing after a few weeks. Looks like the pipes are pretty well-mated, so fingers crossed on it.
     
  10. 15 Feb 2020 at 11:12 AM #10
    svvg

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    Deleted post as watched the first video again and it clarified what I need to do!
     
    Last edited: Feb 15, 2020
  11. 15 Feb 2020 at 1:16 PM #11
    svvg

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    ...although... the kit I bought didn’t come with any gaskets - which I now see was a mistake...

    Anyone recommend which ones I need without a trip to the stealer, as they look unnecessarily expensive from them!

    Oem part numbers are:

    18111723379

    and


    18101405737

    Many thanks!
     
  12. 17 Feb 2020 at 8:25 PM #12
    whipstock

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    I fitted x8r on mine
     
  13. 18 Feb 2020 at 7:26 AM #13
    monkeyboy

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  14. 18 Feb 2020 at 9:01 AM #14
    svvg

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    Thanks guys. Bought some clamps - but they didn't come with gaskets as I thought mine were ok. They are in fact absent/rusted away(!). Taken a punt on some cheapish gaskets/seaing rings from ebay, manufactured by klarius (and cross referenced the part nos on their webcat).
     
  15. 18 Feb 2020 at 11:56 AM #15
    monkeyboy

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    Your gaskets were rusted away? I didn’t even think they were metal?
     
  16. 18 Feb 2020 at 12:54 PM #16
    svvg

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    Well - the one closest to the inside of the car still seems to seal (the joint came lose as I pried the old knackered clamp off. It sealed up ok when I put the new clamp on - which I did first, before really looking at the outermost one....), so presumably still has a sealing ring inside the two flared pipe.

    But when I came to the outermost pipe, I then wondered how on earth the clamps work - as there aren’t two flanges, like on the more inboard pipe, which has an internal gasket ring. That pipe is held together with corrosion and I didn't try to separate at that time - as looked at the original first video posted above and realised I was missing a sealing ring.

    Upon further investigation via the first video above, the outermost pipes fit one inside the other, with an external gasket/seaing ring which the clamps squeeze together. That’s the one I haven’t got - and it must have disintegrated with the clamp - but as I’ll have to separate the box entirely, thought I’d replace both.

    Not sure if I’ve described that very well...(!). Pics below of where I left it when i realised the pipes fit together differently.

    [​IMG]
     
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  17. 18 Feb 2020 at 2:33 PM #17
    monkeyboy

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    theres 2 inside pipe is a ring that seats between the 2 pipes the outside pipe has a ring that goes over the pipe there cheap as chips from bmw best to get some :D
     
  18. 18 Feb 2020 at 3:26 PM #18
    svvg

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    Yep. Exactly. Look to be expensive from bmw though (like £30 for the pair) - so have gone with some aftermarket as mentioned above, for about a fiver each. Wasn't sure what to buy, but I cross referenced the bmw part numbers with the manufacturer I found on ebay (Klarius - they have an on line web-cat). Worth a punt, as if it leaks I’ll soon see soot and it should be easy to swap over to bmw bits as it’ll have been dismantled so recently.
     
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  19. 18 Feb 2020 at 3:54 PM #19
    monkeyboy

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    yep those are the right part numbers
     
  20. 20 Feb 2020 at 12:33 AM #20
    M3Chas

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    After fitting the X8R kit complete with the gaskets they supply, I can confirm my system does not leak.

    Amazingly the OEM gasket didn't leak either with the olive joint ; that had 143k on it. Going by my Miltek, it seems that may have previously leaked or the PO added sealer purely as a precaution.

    I know on Peugeots only the genuine gaskets seemed to work on those ; BTDT...
     

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