Can 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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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 don’t see any soot in the picture where there would indicate a leak.
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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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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.
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 .
__________________ Chuck
Brownsburg Indiana
1992 American Eagle-8.3C-450hp
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.
Here's a post from an ISL-400 owner on how he welded a Walker 3" Turbo Down-Pipe Flange (Part#41657).... because Frightliner was real expensive.
...Or Freightliner may not offer the down-pipe any more?
...What I am not sure about is if this is a stainless steel part or if my turbo-down-pipe requires a stainless steel tube or not? Does anyone know? ...And if it is stainless then don't you need a special welding machine?
Here's a post from an ISL-400 owner on how he welded a Walker 3" Turbo Down-Pipe Flange (Part#41657).... because Frightliner was real expensive.
...Or Freightliner may not offer the down-pipe any more?
...What I am not sure about is if this is a stainless steel part or if my turbo-down-pipe requires a stainless steel tube or not? Does anyone know? ...And if it is stainless then don't you need a special welding machine?
My entire exhaust system is SST. Welding SST requires a specific rod if you stick-weld. Heli-arc and wire welders are other welding methods.
Bottom line_ avoid the aggravation, locate a commercial welding shop nearby and hire it done where it has a great chance of having no pin-holes.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Thanks Ray, In... Do you also know our turbos only have a 3" down-pipe?
I know my tail pipe is 5".
So now I'm curious, because this summer I was thinking about removing my muffler and going with an Areo XL5050 (aka Jones XL5050) which is 5" in and 5" out.
So I would like to know:
What is the dimension of the stock muffler-in?
What is the dimension of the muffler-out?
New subject: Does anyone know if a CAPS-turbo has a Spead Sensor or not?
I know the ISL motors with a HPFR system have one. What about ISC-CAPS or ISL-CAPS?
Thanks Ray, In... Do you also know our turbos only have a 3" down-pipe?
I know my tail pipe is 5".
So now I'm curious, because this summer I was thinking about removing my muffler and going with an Areo XL5050 (aka Jones XL5050) which is 5" in and 5" out.
So I would like to know:
What is the dimension of the stock muffler-in?
What is the dimension of the muffler-out?
New subject: Does anyone know if a CAPS-turbo has a Spead Sensor or not?
I know the ISL motors with a HPFR system have one. What about ISC-CAPS or ISL-CAPS?
I'll measure my exhaust tomorrow. If my turbo has a speed sensor the sensor and wire has been missing since new.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy