r686st Posted March 22, 2014 Share Posted March 22, 2014 I'm finding a little more oil each day after I've run the truck. I pulled the oil cooler and tested it and it's fine. The engine isn't getting any antifreeze/water in it. Where can this be coming from and what's causing it? I'd like to fix ASAP so suggestions are greatly appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/ Share on other sites More sharing options...
b61mack Posted March 22, 2014 Share Posted March 22, 2014 I have changed 3-4 of them and its always been the oil cooler. I went to Mack and bought the whole cooler minis the ends, I think the last one I bought was $ 300.00 exchange at Mack last year. Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-238536 Share on other sites More sharing options...
gearhead204 Posted March 22, 2014 Share Posted March 22, 2014 how did you test the cooler from the oil side or the water side? could be that it is only doing it at eng temp and closes up again as eng. cools. or poss.head gasket starting to fail from oil port to coolant port. I'd recheck the cooler and pressure test oil side to up to 80 psi Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-238565 Share on other sites More sharing options...
r686st Posted March 22, 2014 Author Share Posted March 22, 2014 I did the pressure test and everything is fine. I also just put a new head gasket on a few months ago when I put new heads on. Any other suggestions? Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-238653 Share on other sites More sharing options...
Joe Ditchkus Posted March 22, 2014 Share Posted March 22, 2014 When I had the same problem on a F-Model with a 300 it was the oil cooler. You will have to clean out the cooling system also. I think I used dishwashing powder it was 25 years ago so I hope Glenn Akers checks in to verify. Good Luck Joe D. Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-238655 Share on other sites More sharing options...
br549 Posted March 23, 2014 Share Posted March 23, 2014 We have tested before and showed good when they seep and replaced it later and cure the problem. A remack oil cooler is reasonable price. I would replace it. Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-238719 Share on other sites More sharing options...
thomastractorsvc Posted March 24, 2014 Share Posted March 24, 2014 cascade works well to flush oil out of radiator and coolant lines, that's what I use when I need to flush the system, pour in let run, rinse and repeat Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-239056 Share on other sites More sharing options...
r686st Posted March 27, 2014 Author Share Posted March 27, 2014 Changed oil cooler, water filter, flushed everything, changed all radiator hoses and refilled with antifreeze. I'll see if that solves the problem thanks for the help everyone. Quote Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-239427 Share on other sites More sharing options...
thomastractorsvc Posted March 27, 2014 Share Posted March 27, 2014 Don't forget to post a follow up of what you did and if it works. Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/35123-oil-migrating-into-radiator/#findComment-239487 Share on other sites More sharing options...
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