04-29-2023, 11:30 AM
Steve,
This is Bob Repka. I spoke to you several times last August when I was looking at a 2007 Newell for sale in San Diego. Thanks again for all the info you gave me in that process.
Hopefully you found the problem by now, but if you didn't, consider the following. Its possible that fresh air may be entering the exhaust system between the DPF and SCR syatems. If this is the case, the DEF that is atomized into the system may condense at or just after that point due to slightly lowered gas temperature. If that is the case it will pool and leak leading to crystalization. If any of the remaining DEF is liquid rather than mixed in the exhaust gas, it can pass through the SCR and spray out of the exhaust pipe, as you cited. As an example, check out this link: https://www.bigmacktrucks.com/topic/3879...bowflange/
Did you happen measure the emissions? If you have a base reading you may see a difference as well before correcting this.
Your picture showed a crack in the exhaust pipe near the crystals. Is this area between the DPF and SCR?
This is Bob Repka. I spoke to you several times last August when I was looking at a 2007 Newell for sale in San Diego. Thanks again for all the info you gave me in that process.
Hopefully you found the problem by now, but if you didn't, consider the following. Its possible that fresh air may be entering the exhaust system between the DPF and SCR syatems. If this is the case, the DEF that is atomized into the system may condense at or just after that point due to slightly lowered gas temperature. If that is the case it will pool and leak leading to crystalization. If any of the remaining DEF is liquid rather than mixed in the exhaust gas, it can pass through the SCR and spray out of the exhaust pipe, as you cited. As an example, check out this link: https://www.bigmacktrucks.com/topic/3879...bowflange/
Did you happen measure the emissions? If you have a base reading you may see a difference as well before correcting this.
Your picture showed a crack in the exhaust pipe near the crystals. Is this area between the DPF and SCR?
Bob & Dottie
Newell 1261 & Jeep Grand Cherokee fulltimers
Past Teton Reliance 45' 5th wheel
Custom Volvo VNL780 tow vehicle
2014 Smart car