John Deere Powertech 6068 low hour engine, coolant in oil.

[Curtis T]

Have a 6068 has been getting coolant in the oil, pressure tested the oil cooler it was fine, pressure tested the cooling system very slow to drop pressure. Then pulled oil pan to pressure test and get a visual if the liners are leaking, found the coolant to be leaking out from the oil pump pick up tube, likely coming thru the oil pump outlet tube, thinking maybe an issue with the oil cooler housing, casting flaw, or wonder if its possible that a coolant passage is leaking into a head oil supply passage thru a head gasket leak that isn't affecting the combustion chamber?
Just wondering if anyone has come across this one before, might cut down some time on site.
Thanks in advance for input.

 

[mg2361]

Please post the complete engine serial number.

Those engines, depending on the serial, had oil cooler housing issues where the two O-rings that seal to the cooler had rough machining in their grooves. Is the oil cooler housing cast aluminum or cast iron?

 

[Curtis T]

Yes it had an aluminum housing, I will take it off and have a closer look for machining defects or cracks. Will update later, thanks for the tip

 

[Curtis T]

Cooler was the issue, thanks for the advice.