just discovered coolant in motor oil and oil residue in radiator,machine has 5500 hrs has been great till now ,did pressure test on coolant side and holds steady cold ,what should i do next. Need it on job soon
Could be the head gasket, or the oil cooler. There's a test for combustion gasses in the radiator, might call you local dealer and see if they'll do it for you. Combustion gasses would mean head gasket. Liner seal leaking would give you coolant in the oil, but not oil in the coolant? My guess would be oil cooler core.
Had this happen on a dozer, thought it was oil cooler. Ended up o-ring at the end of one of the sleeves. Took pan off and put little pressure in radiator to find which one was dripping