Oil in coolant

[Rawze]

(01-05-2022 )lwilder27 Wrote:  I have an ISX12 CM2250 that is getting oil in the coolant. I took the oil cooler out and pressure tested it and found a leak. Replaced the oil cooler and seals following quick serves procedure details. Then flushed the cooling system 6 times with restore and it cleaned up nice.

Its been fine for a few months and now has a bunch of oil in the coolant again. I pressure tested the turbo but it held pressure just fine. Checked the transmission cooler and all is solid.

What are my next steps?

this may help: http://rawze.com/forums/showthread.php?t...9#pid67889


also.. does your tranny have an internal heat exchanger?.. it could be coming from the tranny.


also: if you pressurize the coolant system to 20-psi and let it sit over night with the oil pan off the engine, your likely to find out where the 2 are mixing.