Re: 1935 Eight, oil in the radiator

Posted by Owen_Dyneto On 2015/2/22 12:22:52

Of course as JW suggests, if the oil cooler core perforates and oil enters the cooling system, it's possible for the reverse to happen as well. In my own experience with several oil cooler failures, coolant in the oil was not observed though it may have been so minute as to pass detection. Remember the cooling system is a gravity pressure only system, whereas the oil pressure on these engines is fairly high and should be capped by pressure relief valve at something like 60 psi which these engines typically produce, especially on cold start-up. So, the driving force for exchange of fluids is primarily one-way, oil into the coolant. Nevertheless, once the leak has been repaired and the cooling system purged of the oil residue, the crankcase oil should be changed regardless of a negative observation of coolant in the oil.