cummins isx injector

[Hammerhead]

(03-01-2017 )race7820000 Wrote:  Runs good, but now it pushes coolant out overflow. I didn't mess with anything but the injectors them selfs and the cups didn't look like they were leaking.

(03-01-2017 )race7820000 Wrote:  500 mile day it pushes out around 2 gal

That's a significant problem. You need to rectify this ASAP or you could irreversibly damage your motor. For the time being, in order to limp it home loosen the pressure cap on your tank so that the pressure can escape without pushing as much coolant.

Please describe the "bore brush" you used. Was it abrasive enough to scratch the injector bores causing compression blowby up into the injector cup?

What about the injectors, did you use anything to clean or polish them up that may have left some scratches?
Did you replace all the injector O-ring?