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Old 01-23-2020, 04:37 PM   #1
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8.3L turbo to downpipe exhaust leak

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ID:	273077Can anyone tell me what makes the seal between the turbo and the downpipe. I have a steady stream of exhaust coming out of the v band clamp at idle but the clamp is tight and appears to be fine.

Mine is a 12v C6TA 325hp

Noticed by smelling exhaust in coach when braking and a squeal when using exhaust brake. I started prepping the exhaust manifold to replace the gaskets and decided to fire it up and feel around and found this clamp leaking.
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Old 01-23-2020, 05:11 PM   #2
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8.3L turbo to downpipe exhaust leak

There is a metal on metal seal Between the turbo flange and the exhaust flange. If anything Is worn it will leak. Are you sure the v band clamp is tight? The picture looks like it has some room to tighten up. Is it leaking on the bottom side? I donít see any soot in the picture where there would indicate a leak.
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Old 01-23-2020, 07:08 PM   #3
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I checked it and it is tight, I may have to open it up to find out what's inside to seal it
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Old 01-23-2020, 09:13 PM   #4
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I checked it and it is tight, I may have to open it up to find out what's inside to seal it
That type clamp has a torque setting, critical at that location.
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Old 01-24-2020, 05:43 AM   #5
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Attachment 273077Can anyone tell me what makes the seal between the turbo and the downpipe. I have a steady stream of exhaust coming out of the v band clamp at idle but the clamp is tight and appears to be fine.

Mine is a 12v C6TA 325hp

Noticed by smelling exhaust in coach when braking and a squeal when using exhaust brake. I started prepping the exhaust manifold to replace the gaskets and decided to fire it up and feel around and found this clamp leaking.
From my experience there has never been a seal under that V-band clamp. Its a metal flange to metal flange that is held together by the clamp. If it's leaking that bad one of the flange faces might be compromised due to rust or corrosion. Drop that band and have a look is probably your best bet.
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Old 01-24-2020, 06:15 AM   #6
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V Band Clamps are seldom the cause of the Leak- But rather the mating surfaces of the Pipes, most of which are thin and with all of the Heat cycles begin to loose the integrity to seal- Hence the leak, I've replaced the end Collars on mine several years ago for that very same reason.
I would suggest you loosen the clamp and inspect the mating Collar - That's where the problem is- The repair is not a big deal.
If You attempt to re-torque the Clamp- Your leak will most likely re-appear at some point. I initially tried that.
The other Option -If your Lucky - There maybe a V Band Copper Seal between the 2 mating surfaces that has deteriorated or blown out from using the Engine Brake. Not All Chassis manufactures used these Seals .
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Old 01-24-2020, 06:32 AM   #7
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I've seen the flange crack under the clamp. You can buy a replacement and weld it on if that's the case.
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Old 01-24-2020, 10:30 AM   #8
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There is a crush seal made for that, by Cummins. Call them to find out the PN.
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Old 01-24-2020, 12:20 PM   #9
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My V-band clamp had a tear in the metal, could not see it until I remover the clamp. I ordered another one and installed it, no leaks. I was throwing check engine codes because of the exhaust leak.

I had a hard time matching the old clamp numbers, they changed and could not cross reference them, I even called the manufacturer. I ordered 4 different ones until the right one fit.

No seals between the metal flanges, clamp squeezes everything together.

This was last November.

Easy fix
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Old 01-24-2020, 01:56 PM   #10
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I will pull it apart and see what I can find. Thanks for the tips
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