exhaust mid pipe gasket s2r s4r

[insydney]

does anyone have any tricks to make the mid pipe exhaust (conical) gasket seal properly ?
i just put in new gaskets, but the vertical joint doesn't seal.

it's not clear if the conical gasket, which has a V section, is fitted with the V pointing to or away from the udder.

i would prefer to do this without exhaust sealant if possible...

[insydney]

if anyone else is interested i found this:
http://www.ducatimonsterforum.org/index.php?topic=11258.0

[Heath]

If you can make it work without sealant my hat is off to you man.  I always had to use the gasket and Permatex Ultra Copper, let it sit for 24 hours to set before starting the bike and then I would be good to go. If you start it up too soon you will blow it out.

[Speeddog]

if anyone else is interested i found this:
http://www.ducatimonsterforum.org/index.php?topic=11258.0

I do them pretty much as Brad said.

The goal is to ravage them as little as possible.
They need some gentle persistent work to get them fitted to the inner pipe first.
Check the tapered snout of the inner, sometimes they're a bit scruffy and need to be smoothed out.
I'll put them over the inner pipe backwards:


                        |~~ inner   ~~|
                        |                     |
                        |                     |
                        |___________ |

                     /\                        /\

that makes it a bit easier to get it worked over the inner.

Once you've got that done, you can turn it around.

IIRC, the last one I did, I used two gaskets on each joint.


           

[insydney]

I do them pretty much as Brad said.
The goal is to ravage them as little as possible.
They need some gentle persistent work to get them fitted to the inner pipe first.
I'll put them over the inner pipe backwards:

                        |~~ inner   ~~|
                        |                     |
                        |                     |
                        |___________ |

                     /\                        /\

that makes it a bit easier to get it worked over the inner.

Once you've got that done, you can turn it around.

IIRC, the last one I did, I used two gaskets on each joint.

cheers speed' that helps

[insydney]

please see the above sketch...

i am considering fitting these gaskets in the opposite direction,  i.e. with the V pointing towards the cylinder head...

so it sits snugly in the gap between the 'swelling' of the manifold and the wider udder pipe.

this way the exhaust gases tend to force the gasket deeper into the gap and hopefully produce a better seal.
i'll use ultra copper too as this seems to be a popular goo

your thoughts ?

[Speeddog]

Your logic is good. 

It's been a while, but IIRC that orientation on the seal lets it fight you every step of the way.
And it kills the seal in the process.

However, the DIY aspect gives you time and budget to play with.

[insydney]

Your logic is good. 

IIRC that orientation on the seal lets it fight you every step of the way.
And it kills the seal in the process.

yep that occurred to me also, the pregnant dog is you have to drop the whole system each time, it's a walk in the park pulling it off but a bugger refitting (if you don't have a second pair of hands)
and of course it's great weather here atm and i'd rather be riding 

oh well i'll take my chances and give it a whirl... i think the gaskets pretty much get stuffed anyway particularly if your using sealant. i'll have to search for some cheap generics

[booger]

And another good reason to go to an aftermarket full system. Those copper donut gaskets are the worst.