exhaust tightness?

1. 1-1dicky Frequent Poster Joined: Nov 2009 maidstone Posts: 702 saxo vtr

   #1 9th July 2010, 00:40

   how tight should the two bolts be that hold the cat pipe to the downpipe? this is on my mk1 cat under car. iv been told they cant be too tight or too loose as it has to flex any help appreciated
   
   thanks
2. Sparco_Tom Saxperience Addict Joined: Jan 2007 Aylesbury, Bucks Posts: 12836 Yeaaahh Fiesta

   #2 9th July 2010, 01:18

   tight as you can get them, or tight enough so that the exhaust doesnt blow
3. bushy90 Frequent Poster Joined: Jan 2008 Kent Posts: 602 R53 MCS

   #3 9th July 2010, 09:08

   I am having trouble getting the olive clamp that joins the centre pipe to the backbox to secure properly and hold it tight, i used sealant and the clamp, its done up as tight as it goes, but the backbox wobbles slightly? is there a different sort of clamp i can get?
4. 23carragold Saxperience Forum Bum Joined: Apr 2009 Posts: 4861

   #4 9th July 2010, 10:15

   Quote:

   Originally Posted by bushy90 I am having trouble getting the olive clamp that joins the centre pipe to the backbox to secure properly and hold it tight, i used sealant and the clamp, its done up as tight as it goes, but the backbox wobbles slightly? is there a different sort of clamp i can get?

   This is the clamp you should be using:
   
   
   
   If you over tighten it, you'll end up bending the connecting flanges and then you will have more problems trying to bend it back into shape. Do it as much as you can but don't put extreme pressure on it. A little gasket sealant should also work well, but not exhaust paste. That stuff is useless.
   
   It just hardens and then eventually falls off due to the vibrations in the exhaust system.
5. bushy90 Frequent Poster Joined: Jan 2008 Kent Posts: 602 R53 MCS

   #5 9th July 2010, 10:18

   Nice one pal, shall go and purchase a new one, and some proper sealant, take it gum gum isn't all that then?
6. 23carragold Saxperience Forum Bum Joined: Apr 2009 Posts: 4861

   #6 9th July 2010, 10:22

   Quote:

   Originally Posted by bushy90 Nice one pal, shall go and purchase a new one, and some proper sealant, take it gum gum isn't all that then?

   That gum stuff is complete turd. Your exhaust system shakes when accelerating/decelerating, and because it hardens, the vibrations make it go brittle and crack it up, and it all falls out.
   
   Get some silicone high temp gasket sealant, it's more flexible and far better.
7. bushy90 Frequent Poster Joined: Jan 2008 Kent Posts: 602 R53 MCS

   #7 9th July 2010, 10:29

   Thanks again for the advice, much appreciated, take it somewhere like halfrauds sell this?
8. 23carragold Saxperience Forum Bum Joined: Apr 2009 Posts: 4861

   #8 9th July 2010, 12:02

   They should do, but pop down to Euro Car Parts or GSF Car parts, cheaper there and usually you get better stuff.