Click Click Boom!!!!!

A DEF icicle? I’m sure the people in government are sitting back and laughing at us truck drivers over all the troubles we have to go through just to make a buck.

 

Cummin or Paccar?
What do you think caused it?

 

We'd see those often on the CAT packers. Vibration from the drum would eventually crack the DEF injector. Then it'd crystalize all down the back right corner of the engine. With any luck it'd leach in to the aftertreatment harness connection and burn it up.

Seen a 4K or 5K crack a DEF injector and spray it into the alternator. Locked it up solid!

 

AModelCat: did the def corrode the alternator or what happened to it?

 

Yep. Got into the rotor/bearings and locked it up bad enough to shred the serpentine belt. Took out the tensioner as well IIRC.

 

Sounds more corrosive than Pepsi or coca-cola

 

Haven't seen a def-sickle since I stopped working on cars. Last one was bmw the top of the def tank under the trunk was completely covered. Was a sight once we pulled it down.

 

Paccar. Came apart for warranty updates. Could have been overdosing def causing it to buildup. Just cleaned out the mess and sent it back to work. Truck was a new unit to the customer, no previous history.

 

Do you if that truck does heavy or light loads?

 

Im not sure about this case.

Most of the DEF crystalization buildup that I have seen is under light load and short duty cycle application. From memory the worst was a switcher for spotting trailers. Exhaust temps never got hot enough to even regen let alone have adequate Nox conversion