(11-01-2020 )suined Wrote:  Another thing I just thought of. The oil was brand new when I picked it up, the truck kept flashing regen needed on the way home, then the last 50 miles it actually derated. The oil already is black. I don't think this would cause a whine?

(11-01-2020 )JimT Wrote:  

(11-01-2020 )suined Wrote:  Another thing I just thought of. The oil was brand new when I picked it up, the truck kept flashing regen needed on the way home, then the last 50 miles it actually derated. The oil already is black. I don't think this would cause a whine?

Well that can't be good. Oil shouldn't get black that fast, especially only 100k mi after an inframe. While probably not directly related to the noise it most likely means your getting A LOT of soot pumped into that oil.

The air compressor being new catches my attention. Not sure if it would be the cause, but maybe someone didn't time it right when replacing the compressor?

Have you pulled the intake pipe off the turbo (leading to the CAC) to check for any oil leaks or inspect the turbine for wear or excessive dirt/soot buildup?

What about the cam/rockers/valves? have you pulled the rocker cover and inspected in there?

If all you have is a 400 mi trip home, presumably bobtail, then there's not much experience with this truck to lean on. Gonna have to do a lot of exploration and investigation. You mentioned being in PA. What part?

(11-01-2020 )suined Wrote:  Another thing I just thought of. The oil was brand new when I picked it up, the truck kept flashing regen needed on the way home, then the last 50 miles it actually derated. The oil already is black. I don't think this would cause a whine?

(11-01-2020 )Rawze Wrote:  

(11-01-2020 )suined Wrote:  Another thing I just thought of. The oil was brand new when I picked it up, the truck kept flashing regen needed on the way home, then the last 50 miles it actually derated. The oil already is black. I don't think this would cause a whine?

Send an oil sample to a reputable lab once it gets about 10k miles on it or so and not just have it done at an oil change place with one of those stupid quick-check machines. - See what is in that oil.

(11-02-2020 )Mattman Wrote:  Does the whine seem to change when the air compressor kicks in and starts making air?

(11-02-2020 )suined Wrote:  

(11-02-2020 )Mattman Wrote:  Does the whine seem to change when the air compressor kicks in and starts making air?

Nope whine stays the same, air compressor makes clicking noise while building air though, none of my other trucks make that noise

(11-03-2020 )Waterloo Wrote:  

(11-02-2020 )suined Wrote:  

(11-02-2020 )Mattman Wrote:  Does the whine seem to change when the air compressor kicks in and starts making air?

Nope whine stays the same, air compressor makes clicking noise while building air though, none of my other trucks make that noise

This "Clicking" noise, is it the actual compressor ior is it the Air Dryer? I have heard plenty of air dryers click, can't say I have heard an air compressor do that. Normally on the Cummins, we get the compressor knock, it tends to get louder as the pump ages.

And as far as "assuming" the dealer installed the compressor correctly is just that, and assumption... We all know the definition of assume, it is to make an ass of you and me... ;-)

May want to go over the compressor if that is what is actually ticking, it may not be lined up properly to the front gear train, which entails removing it.