macattack Posted September 13, 2023 Share Posted September 13, 2023 (edited) Developed a oil leak on my cooler. I am not familiar with a oil cooler and therefore any help is greatly appreciated. Does oil or coolant go thru the small tubes on the core? Also in the pic is that (about 1 in or 1.5 in) steel line above the cooler oil or coolant. I think that is where my leak is. I believe there is a couple of o rings and a gasket there. Again any help is greatly appreciated. Thanks Edited September 13, 2023 by macattack 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/ Share on other sites More sharing options...
BOBWhite Posted September 13, 2023 Share Posted September 13, 2023 I believe oil goes through the small tubes and the coolant surrounds the tubes. The oil first goes through the oil cooler then it goes to the oil filter assemblies. Heres a pic from the manual that shows each of the tubes. I think the tube you are referring to carries the cooled oil back to the oil filter assembly. Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/#findComment-538756 Share on other sites More sharing options...
Joey Mack Posted September 13, 2023 Share Posted September 13, 2023 Coolant through the tubes, oil around it.. a closer picture would help. You sure it's not coolant? Did you wipe it off before taking the picture? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/#findComment-538764 Share on other sites More sharing options...
macattack Posted September 13, 2023 Author Share Posted September 13, 2023 Thanks for the info. This pic was taken when there were no leaks. I will try to get a recent pic. Almost sure its oil leaking from the steel tube #10 on top of cooler. I think #11 the o ring in the diagram is my issue. Can that o ring and gasket be replaced without removing the cooler? Thanks again. Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/#findComment-538777 Share on other sites More sharing options...
terry Posted September 13, 2023 Share Posted September 13, 2023 Unbolt tube #10 at front of oil cooler and slide out of oil cooler head, pry old o ring out of cooler head, put new O ring in in ,put some oil or a dab of grease on oil outlet tube and reinstall. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/#findComment-538779 Share on other sites More sharing options...
macattack Posted September 13, 2023 Author Share Posted September 13, 2023 Thanks Terry. Do I have to drain the oil? Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/#findComment-538780 Share on other sites More sharing options...
fjh Posted September 13, 2023 Share Posted September 13, 2023 31 minutes ago, macattack said: Thanks Terry. Do I have to drain the oil? no Quote Link to comment https://www.bigmacktrucks.com/topic/73302-school-me-on-my-oil-cooler/#findComment-538783 Share on other sites More sharing options...
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