Rawze.com: Rawze's ISX Technical Discussion and more

Cummins cm2350 2015 Pete 579. why does EGR cooler have liquid and damp soot a month after replacing with new Cummins part?

Condensation possibly?

EGR circuits and dampness from condensation go hand in hand, especially in cold weather and during engine warmup. Make sure it is not simply that. Not sure about the CM2350's, but on my CM871 egr circuit, I have seen as much as 1/2 cup of water/condensate (clearly not coolant) come out of the egr while working on the enigne and things partially disconnected.

Also, if the EGR cooler was not installed properly, it can get leaky again...

Pressurize the coolant system to 20-psi and let it sit over night with the back elbow removed from the EGR cooler. See if it is flooded with coolant the next day.

(03-06-2019 )Rawze Wrote: [ -> ]EGR circuits and dampness from condensation go hand in hand, especially in cold weather and during engine warmup. Make sure it is not simply that. Not sure about the CM2350's, but on my CM871 egr circuit, I have seen as much as 1/2 cup of water/condensate (clearly not coolant) come out of the egr while working on the enigne and things partially disconnected.

Also, if the EGR cooler was not installed properly, it can get leaky again...

Pressurize the coolant system to 20-psi and let it sit over night with the back elbow removed from the EGR cooler. See if it is flooded with coolant the next day.

Thanks!! Very good to know about condensation possibility...have the rad pressurized now...