ARMYMACK Posted July 16, 2014 Share Posted July 16, 2014 any and all advise will be welcome ok the minute you crank the truck it starts pushing coolant out I have eliminated water pump, air compressor done compression test with the fluid Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/ Share on other sites More sharing options...
staxx Posted July 16, 2014 Share Posted July 16, 2014 Welcome to BMT my friend , cracked head or fire ring blown head gasket or low liner height. Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/#findComment-253050 Share on other sites More sharing options...
gearhead204 Posted July 16, 2014 Share Posted July 16, 2014 drop the exhaust manifold and look for the "clean" port that will tell you which head to pull also check the oil pan loosen the drain plug and check for antifreeze if found do main and rod. brgs. also. Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/#findComment-253052 Share on other sites More sharing options...
wheeler73 Posted July 16, 2014 Share Posted July 16, 2014 What year and engine is in the truck? MP engines also have injector cup issues. Have also seen some E-tech and ASET injector cup issues which is rare compared to the MP. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/#findComment-253062 Share on other sites More sharing options...
mrsmackpaul Posted July 16, 2014 Share Posted July 16, 2014 maybe just crook head gasket pull some injectors out of one head at a time see which head is leaking Paul Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/#findComment-253072 Share on other sites More sharing options...
bbigrig Posted July 18, 2014 Share Posted July 18, 2014 I have had an MP engine pushing coolant out of the expansion tank due to injector cup failures.( That and doorknobs that install them poorly at the dealer) Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/#findComment-253199 Share on other sites More sharing options...
wheeler73 Posted July 18, 2014 Share Posted July 18, 2014 Lol Bbigrig so true! Unfortunately most so called techs don't take pride in their work and are nothing but parts changers. It gives the rest of us techs a bad name. Unfortunately now I do not get to repair most trucks as I am the triage tech and only diagnose them anymore. I miss the engine work as that is my favorite. Oh well someone needs to diagnose the trucks for the parts changers. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36370-pressure-in-cooling-system/#findComment-253204 Share on other sites More sharing options...
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