+- Rawze.com: Rawze's ISX Technical Discussion and more (http://rawze.com/forums)
+-- Forum: Big Truck Technical Discussion... (/forumdisplay.php?fid=1)
+--- Forum: Ask Your question... (/forumdisplay.php?fid=45)
+--- Thread: N14 diesel in coolant (/showthread.php?tid=9966)
N14 diesel in coolant - Jas2153 - 02-16-2025
I took my radiator cap off and there was diesel in the coolant. I was told by a few people that a bad injector cup is the most likely problem. I know there are probably a number of other issues that could cause this problem. Can Cummins Insite help with diagnosing this before taking the head/motor apart? Motor is an N14.
RE: N14 diesel in coolant - tree98 - 02-16-2025
No insite can't help you with this. You could pull all the injectors and pressurize the cooling system to 5 psi (no more than 5 psi with injectors removed) and you'll find the leaking cup/cups like that.
RE: N14 diesel in coolant - Jas2153 - 02-19-2025
(02-16-2025 )tree98 Wrote: No insite can't help you with this. You could pull all the injectors and pressurize the cooling system to 5 psi (no more than 5 psi with injectors removed) and you'll find the leaking cup/cups like that.
Thanks. Any recommendations on flushing the radiator/cooling system?
RE: N14 diesel in coolant - Rawze - 02-19-2025
(02-19-2025 )Jas2153 Wrote:(02-16-2025 )tree98 Wrote: No insite can't help you with this. You could pull all the injectors and pressurize the cooling system to 5 psi (no more than 5 psi with injectors removed) and you'll find the leaking cup/cups like that.
Thanks. Any recommendations on flushing the radiator/cooling system?
cummins restore, and following their instructions is the best way. Stay away from any kind of soaps in the coolant system.. its a nightmare to get it all out again.
RE: N14 diesel in coolant - hhow55 - 02-19-2025
Bad injector cups?
RE: N14 diesel in coolant - Jas2153 - 02-19-2025
(02-19-2025 )hhow55 Wrote: Bad injector cups?Yes. Found out today.