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Exhaust brake screeching sound

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NOx adsorber catalyst part number

P2609, after P2262 and P0401

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While going down a steep towing my trailer the EB started making this annoying screeching sound, it only did it under a load. Took the truck in and explained what was going on and I told them it only does it under a load. I mentioned Check the rear exhaust manifold to egr cooler gasket. They kept the truck a week then reported they couldn't find anything. I reminded them it only does it under a load but I thought with all their diagnostic equipment they have they might be able to find the problem. They asked if I could bring my trailer there and we go for a ride so I did, mechanic heard the noise and said it's a bad turbo since the truck is out of warranty I paid out of pocket, not a cheap repair, I picked the truck up hooked up my trailer and drove up a mountain near by the same noise is still there. I called the shop and they asked me to come back with truck and trailer again and we went for another ride and the mechanic heard the noise again. Now they need to contact Chrysler to get an ok to replace the turbo again so Chrysler said go through everything and make sure it isn't another issue I said didn't you guys already do that when you had my truck for a week? Yes they did but it's what Chrysler is requiring. Ok got approval for another turbo picked up truck went back up the mountain and once again same noise only now it's worse it even does it without a load so I called the shop this time they didn't require me to bring the trailer, they kept the truck four days and I asked if they put another turbo on and was told no the mechanic just went through everything and tightened up everything so I knew right away it wasn't going to be right. I took the truck around the block and EB on and tow haul slowing down coming to a stop sign and bingo there is the noise again. Now they are going to meet with the service manager and see if they can possibly find a brand new turbo, the other two were rebuilds, well it's impossible to get a brand new turbo. So now they are going to have their top guy look at the truck, I'm like I thought they guy working on it already was the top guy anyway the truck was dropped off yesterday and we will see what happens. Mu gut feeling is it isn't the turbo issue at all but a leak in the system. On the bright side at least they keep paying for rentals, I had a Challenger, a Hemi 1500 pu, some Altimo hybyrd and now I'm in a Charger.
If anybody has any suggestion on where this expert mechanic can look I'm all ears.

BTW the truck is 2008 CC with 58k on it
 
Mybuddy had a similar noise with a truck a couple of years ago. The dealer had replaced a couple of turbos, then they found a new one, same thing. He finally ran it over to Cummins West and they ran it on the dyno (this truck would do it under heavy load) and found an exhaust leak on #6 port on the bottom side where you could not see the soot. Are you working with Chapman or Towbin?
 
Man, Turbo Brake Actuation creates back pressure in the exhaust manifold....Durrrr..

Why in the H E double hockey sticks would they keep putting turbos on it before checking the integrity of the related gaskets????

You need a technician because right now you are dealing with parts changers my friend......BIG difference.....
 
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Man, Turbo Brake Actuation creates back pressure in the exhaust manifold....Durrrr..

Why in the H E double hockey sticks would they keep putting turbos on it before checking the integrity of the related gaskets????

You need a technician because right now you are dealing with parts changers my friend......BIG difference.....

Well it's a new man on it this morning supposedly the best we will see
 
We have had customers do this same thing to themselves, call up and order a turbo, replace it themselves and then call to tell us the turbo is bad...the engine is still making the noise.

We go out in the driveway, have them open the hood and point out the black streaks where the gaskets are leaking.......we've seen it be either manifold or turbo mounting gaskets leaking.

Not exclusive to Cummins engines, either.

My sincerest wishes for a correct repair this time for you!!!!

Mike.
 
My parts changer comment may be a bit harsh but I have little tolerance for someone trying to fix something that can't even take the time to figure out how the whole thing works.

If you don't understand how it works then you cannot fix it.

Hundreds of thousands of dollars of customer and OEM money are wasted daily in similar scenarios.
 
My parts changer comment may be a bit harsh but I have little tolerance for someone trying to fix something that can't even take the time to figure out how the whole thing works.

If you don't understand how it works then you cannot fix it.

Hundreds of thousands of dollars of customer and OEM money are wasted daily in similar scenarios.

Oh I understand, I have my fingers crossed and trying to think positive. Thanks for your help I forwarded to the service writer and asked him to pass it on to the mechanic
 
I am assuming that you filtered my comments so that you don't wind up with a dead codfish stashed behind one of your door panels.........:D
 
My parts changer comment may be a bit harsh but I have little tolerance for someone trying to fix something that can't even take the time to figure out how the whole thing works.

If you don't understand how it works then you cannot fix it.

Hundreds of thousands of dollars of customer and OEM money are wasted daily in similar scenarios.

Couldn't have said it better myself. So true. Years ago I was at a Stihl service school/update seminar, and the trainer spent an inordinate amount of time imploring techs to be sure to isolate magnetos to eliminate kill wire, kill switch and other issues before replacing a mag. At lunch I asked why he dwelled on something so simple and obvious, so he said follow me and took me to a test station where he slid an enormous box from under the bench. It was chock full of mags, and he said they were all good mags that dealers replaced under warranty, and were charged back for!
 
I posted a similar thread about this time last year as we returned from Alaska, but referred to it as a "chirp". Went through the new turbo buggaloo, took the manager for a ride. He says Yep! still there. They found a little soot under the butterfly valve on the exhaust manifold, that cost $700, still had the chirp. They then took the EGR back off, used block off plates hooked up all kinds of diagnostic equipment, tech came back from a road test, head hanging. They basically said the next option was to remove the exhaust manifold, and I should be prepared to buy an new manifold because the old one will never go back on the studs! Plus the manifold was $1500, and unavailable! Soooo! I decided as long as I didn't feel any appreciable reduction in power when towing our 30 ft. 5'er. So here I am with an additional 7k miles chirping the whole way when pressure is increased in the exhaust system with either "pedal down" pressure or EB back pressure. I'm more inclined to agree with Wilsons view of a leaking exhaust gasket around a port. I have a 134k egr service to perform now, so I think I'll dive in a little deeper and replace the manifold gasket while there. Does any one know if it can be done with out dropping the turbo (supporting it with a jack)?
 
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