c-mac Posted May 14, 2019 Share Posted May 14, 2019 I'm pretty sure its fuel anyway. I found it while replacing the oil cooler cover, coolant was pouring out the bottom at the front of the engine. It already had the updated cover with metal gasket. I noticed after removing the cover the rectangular rubber gasket where the cover butts up to the rear of the water pump housing was torn and swollen. At that point I pulled the thermostat and the rubber gasket was gone. Anyway I replaced all of the coolant oring seals, they all fit loose and some looked like a rat had been chewing on them. Now I'm replacing the cups and Injector orings. The engine ran fine and the injectors look real clean. I really don't see any bad orings on the cups or injectors. The injectors have two orings on them so assume that are original. I guess I should go back with just the one oring on the injectors like the new ones come. I anyone has anything to add or anything else I haven't considered please chime in. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/57190-2013-mp8-fuel-in-the-coolant/ Share on other sites More sharing options...
steeler Posted May 24, 2019 Share Posted May 24, 2019 Did the new cups fix the problem? Quote Link to comment https://www.bigmacktrucks.com/topic/57190-2013-mp8-fuel-in-the-coolant/#findComment-423553 Share on other sites More sharing options...
JoeH Posted May 25, 2019 Share Posted May 25, 2019 I am so glad I have older trucks. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/57190-2013-mp8-fuel-in-the-coolant/#findComment-423674 Share on other sites More sharing options...
turckster Posted May 30, 2019 Share Posted May 30, 2019 The only place that the two systems come together is the injector cup area. A small imperfection or wear in the o-ring could easily let fuel past but hold off coolant pressure. Did you check the fuel tanks for coolant? Quote Link to comment https://www.bigmacktrucks.com/topic/57190-2013-mp8-fuel-in-the-coolant/#findComment-423954 Share on other sites More sharing options...
c-mac Posted June 5, 2019 Author Share Posted June 5, 2019 (edited) On 5/23/2019 at 7:06 PM, steeler said: Did the new cups fix the problem? pretty sure it did, its been on the road for a month. I also put new orings one the injectors Edited June 5, 2019 by c-mac Quote Link to comment https://www.bigmacktrucks.com/topic/57190-2013-mp8-fuel-in-the-coolant/#findComment-424474 Share on other sites More sharing options...
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