Fran3682821 Posted July 26, 2015 Share Posted July 26, 2015 Just installed a new EGR cooler along with EGR valve and new manifold gaskets. Never got to start the truck yet because the coolant pipe from the front of the egr cooler that leads up the the thermostat housing I think it is wont stop leaking. Pipe has new o rings on each end and leaking well without engine running. Wondering if anyone on here has had any problems like this?? Maybe just not lined up well blows my mind. Quote Link to comment https://www.bigmacktrucks.com/topic/41091-installing-new-egr-cooler-on-mp7/ Share on other sites More sharing options...
Macktech689 Posted July 26, 2015 Share Posted July 26, 2015 I have replaced dozens of coolers on MP engines and have never had any leaks, sounds like one of the seals was damaged during installation. You'll need to remove the tube and check them. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41091-installing-new-egr-cooler-on-mp7/#findComment-297958 Share on other sites More sharing options...
Fran3682821 Posted July 26, 2015 Author Share Posted July 26, 2015 Must be that. We did the job friday and the mechanic that did the job couldnt finish because we were missing 2 bolts for the egr valve. So when the bolts arrived by bus Saturday I installed the last 2 bolts and attached the exhaust to the turbo and attached the heater lines for the cab. When i filled it up with antifreeze it started leakin out of the top of the pipe. Than when I removed the wedges and repositioned the pipe so it seemed more centered in than got worse and was leakin at the bottom of the pipe before the antifreeze had a chance to reach the top of the pipe. Quote Link to comment https://www.bigmacktrucks.com/topic/41091-installing-new-egr-cooler-on-mp7/#findComment-297969 Share on other sites More sharing options...
turckster Posted July 28, 2015 Share Posted July 28, 2015 The new egr cooler kit should have come w/new o-rings for the coolant tubes. I replace all coolant tube o-rings when they are removed despite how they look. They are cheap and I take no chances. I personally like to coat the coolant o-rings w/Eaton/Fuller silicon o-ring lube to ease install, some others use dish wash soap, to each their own. Quote Link to comment https://www.bigmacktrucks.com/topic/41091-installing-new-egr-cooler-on-mp7/#findComment-298189 Share on other sites More sharing options...
wheeler73 Posted July 29, 2015 Share Posted July 29, 2015 I use molycoat as it lubes them and then makes them swel to seal better. That is what Mack wanted to be ued when the MP's came out and I still use it with no issues. Quote Link to comment https://www.bigmacktrucks.com/topic/41091-installing-new-egr-cooler-on-mp7/#findComment-298255 Share on other sites More sharing options...
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