Donald smith Posted April 1, 2018 Share Posted April 1, 2018 2014 mack leu with cummins islg has orange foam in cooling system possible oil from leaking head gasket or liner ? any ideas ? Quote Link to comment Share on other sites More sharing options...
fjh Posted April 1, 2018 Share Posted April 1, 2018 (edited) Does it smell like oil? Could be a trans cooler issue it would be black if it were engine oil fuel is another consideration! Edited April 1, 2018 by fjh Quote Link to comment Share on other sites More sharing options...
Donald smith Posted April 1, 2018 Author Share Posted April 1, 2018 this is a natural gas engine the oil is very clean ( amber ) I press. tested trans. cooler didn't seem to leak Quote Link to comment Share on other sites More sharing options...
BC Mack Posted April 1, 2018 Share Posted April 1, 2018 trans pressure (I surmise Allison) is much higher than shop air... if that is what you were using for test.. take a coolant sample and get it tested agreed that nat gas engine oil stays light brown but so does trans atf or transynd BC Mack Quote Link to comment Share on other sites More sharing options...
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