DG expansion chambers and flanges leaking

[Pravin]

Hi all ,


Been real long time ,

I am facing issues on my DG chambers joints...they don't fit snug as there is not gasket and there is always smoke and oil residue around the flanges area .

Any solution to this ? How I can fill the gap between the OD of flange and ID of bend pipe ? Any teflon gasket I can get or can I wrap the plumbing teflon tape we use to wrap on the threads of metal pipes before we join ?

Cheers ,
Pravin

[pdxjim]

Goop it all up with hi-temp RTV.

Clean everything first.

Then, I put a liberal amount of RTV on the exhaust gaskets and mating surfaces of the flanges/manifolds.

Also, a good amount on the joint between the manifolds and pipes.

Let it cure at least 12 hours or more before runningf the engine

[rodneya]

Mine always leaked, no matter how much high temp silicone or other sealers I smeared in there.

Get a set of manifolds with orings  from Gra2strokes or weld your flanges to the pipe.

[pdxjim]

Mine always leaked, no matter how much high temp silicone or other sealers I smeared in there.

Get a set of manifolds with orings  from Gra2strokes or weld your flanges to the pipe.

Yup.  Garrett's manifolds do not leak.

And don't weld your old ones on.  They will crack for sure.

[sav0r]

I added an OD ring to the flange so that the pipe has both ID and OD. Then I just stuff the flange with high temp o-ring stock. It's not perfect, but the amount of leak is greatly reduced. I suppose using some RTV on them would make them pretty much leak free, I just don't like cleaning that junk up.

[Pravin]

Goop it all up with hi-temp RTV.

Clean everything first.

Then, I put a liberal amount of RTV on the exhaust gaskets and mating surfaces of the flanges/manifolds.

Also, a good amount on the joint between the manifolds and pipes.

What is RTV ? Sorry am not heard of that before ...

[RDFL]

https://www.permatex.com/products/gasketing/ultra-series-gasket-makers/permatex-ultra-black-maximum-oil-resistance-rtv-silicone-gasket-maker-4/

[Pravin]

Thanks :) I'll try to get something similar here !!

It's a mess to clean that oily muck .... And the smoke comes  out too as I start the bike

Cheers
Pravin 

[Pravin]

I added an OD ring to the flange so that the pipe has both ID and OD. Then I just stuff the flange with high temp o-ring stock. It's not perfect, but the amount of leak is greatly reduced. I suppose using some RTV on them would make them pretty much leak free, I just don't like cleaning that junk up.

Do you have pic of what exactly you did for OD ? yours are also DG ones ?they didn't come with any gaskets just pipes n flanges n spring

Cheers
Pravin 

[RDFL]

Thanks :) I'll try to get something similar here !!

It's a mess to clean that oily muck .... And the smoke comes  out too as I start the bike

Cheers
Pravin

Let it completely cure (best overnight) before starting engine.

[Pravin]

Thanks :) I'll try to get something similar here !!

It's a mess to clean that oily muck .... And the smoke comes  out too as I start the bike

Cheers
Pravin

Let it completely cure (best overnight) before starting engine.

Ok so basically I need to clean the flanges and bend pipes , apply this sealant on flanges OD and install the pipes and seal again for any gaps and let it dry overnight !!

[JB Weld]

I used the old GM V6(3.1 or 3.4 liter?) thermostat gasket to seal flanges to the cylinders, can't remember if I used sealant. Then some Permatex Ultra Black  on the exhaust joint. Haven't had it leak at all and very happy with the results.

[Washerman]

Make sure the pipes are up all the way on the flanges. Mine were leaking bad and after further investigating, I saw the pipes hitting the nuts for the flanges. Turn the nuts so that the flat side is towards pipes to allow them to go up all the way. Loosen the rear mounts a little if you have to this gives some slack to make it easier to get them up farther. I used sealers before it just doesn't last and gets nasty. They still leak a little but I'm ok with it.

[Pravin]

Thanks all for your inputs ,

I ll check the alignment and make sure they are flush on the joints .. before that I'll clean n apply RTV and make a good sealing.

Keep you posted 🤠

Cheers
Pravin

[AAAltered]

I've also found that you need to let the RTV set up for a day before you start the bike....