Mackken Posted January 26, 2020 Share Posted January 26, 2020 2014 truck was running great then started missing and low coolant light came on. Oil is way over full with coolant. Towed it home and there’s coolant coming from turbo exhaust output but don’t think it’s the turbo. Tried pressure testing and won’t hold any pressure and have pulled egr cooler inlet and outlet they are dry. Injector cups? What’s most common with these? Quote Link to comment https://www.bigmacktrucks.com/topic/60711-mp8-coolant-in-oil/ Share on other sites More sharing options...
fjh Posted January 26, 2020 Share Posted January 26, 2020 (edited) 🥵 All of the above plus,! if you have developed a miss it is possible you have a valve failed and it has compromised a piston and a liner ! Edited January 26, 2020 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/60711-mp8-coolant-in-oil/#findComment-441394 Share on other sites More sharing options...
steeler Posted January 31, 2020 Share Posted January 31, 2020 Cracked head? If you have coolant exiting the turbo, more than likely you have coolant entering a cylinder. If not from the egr cooler, could be a head problem. Pull the oil pan and pressurize the cooling system and you should see where it's coming from. I've got an mp7 I'm rebuilding now for a leaking liner. It washed out one cylinder, but obviously I didn't have coolant in the exhaust. Quote Link to comment https://www.bigmacktrucks.com/topic/60711-mp8-coolant-in-oil/#findComment-441619 Share on other sites More sharing options...
Mackken Posted February 8, 2020 Author Share Posted February 8, 2020 It had a broken valve and crack in the liner. Replaced the whole engine and gonna rebuild this one for spare since we have more then 1 of these trucks 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60711-mp8-coolant-in-oil/#findComment-442219 Share on other sites More sharing options...
Mack Technician Posted February 8, 2020 Share Posted February 8, 2020 4 hours ago, Mackken said: It had a broken valve and crack in the liner. Replaced the whole engine and gonna rebuild this one for spare since we have more then 1 of these trucks When they go does it drop the valve head into the cylinder and beat it to destruction? Quote Link to comment https://www.bigmacktrucks.com/topic/60711-mp8-coolant-in-oil/#findComment-442220 Share on other sites More sharing options...
fjh Posted February 8, 2020 Share Posted February 8, 2020 (edited) 2 hours ago, Mack Technician said: When they go does it drop the valve head into the cylinder and beat it to destruction? It can !How ever if you catch it soon enough your best case senerio is to ! replace PISTON ,LINER ,HEAD, most likley TURBO and possibly oil pump! Its a fairly pricey fix! because the piston is skirtless valve peices cock piston to one side when it gets to the top and the small piston skirt area cracks the liner when it cocks! we have Seen this happen a few times now ! Its not a frequent thing like cups or anything , just a happening! Edited February 8, 2020 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60711-mp8-coolant-in-oil/#findComment-442229 Share on other sites More sharing options...
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