Jeremy_Brault Posted August 5, 2017 Share Posted August 5, 2017 I have an 04 ac460p. That is using antifreeze. The other day I was trying to find the source and found that the antifreeze is running out the engine breather hose. I had the oil pan off few days ago to roll bearings in it and had no traces of Antifreeze there. And nothing inside valve covers, so my question is what is causing it to run out the breather? It uses about 1/2 a gallon a10hour day Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/ Share on other sites More sharing options...
fjh Posted August 5, 2017 Share Posted August 5, 2017 You need yo pull the Pan again and pressure up the cooling system and look! Possible causes Liner leakage also plugs in the head can leak There was a cavitation issue with the water pump /front cover at one point but I'm not sure if it related to the AC engine or not! Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376730 Share on other sites More sharing options...
Mack Technician Posted August 6, 2017 Share Posted August 6, 2017 You should have had a white, monkey funk, slime festival inside your motor particularity under valve covers, in breather tube and coalescing mesh. That's a lot of coolant. Grab an oil sample and send it in to be sure the moisture drops are coolant and not natural aspiration moisture. If you saw nothing in motor I would starting hunting for other outlets. There are a couple worm clamps on an AC motor you can't see or tighten. You have to dig to get on them. Egr cooler? FJH has a good point about maintaining psi during an internal insection. Sounds like you know your machine ( bearing roll). Good luck and good returns!!! Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376793 Share on other sites More sharing options...
dcrow Posted August 7, 2017 Share Posted August 7, 2017 My first thought was EGR cooler as well. Seems to be the weakest point. Check for traces of coolant in the mass flow tube. Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376846 Share on other sites More sharing options...
Jeremy_Brault Posted August 7, 2017 Author Share Posted August 7, 2017 I have no white funky slime like water oil mix makes, I also have deleted the egr and egr coolers 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376867 Share on other sites More sharing options...
Mack Technician Posted August 7, 2017 Share Posted August 7, 2017 Have you left 15PSI on it for a good sit-n-wait? No gray paint burn offs, no pink crust anywhere? Engine fans are great for diffusing coolant drops, forward facing side of any filter missing it's cheap paint job? Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376868 Share on other sites More sharing options...
Ezrider Posted August 7, 2017 Share Posted August 7, 2017 my truck has a slight coolant seep at a water pump gasket. only looses about a gallon of coolant every 2 months still leaves a pretty good white trail on the engine. i would think that much coolant loss external would be very noticable. Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376890 Share on other sites More sharing options...
Jeremy_Brault Posted August 8, 2017 Author Share Posted August 8, 2017 The leak is not external, that's the funny part it's internal runny out crankcase breather. I did not sample but tasted it and its antifreeze Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-376955 Share on other sites More sharing options...
Jeremy_Brault Posted August 13, 2017 Author Share Posted August 13, 2017 Well I found that the sleeves were leaking on cylinders 2&5 so I ordered a new long block Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-377350 Share on other sites More sharing options...
fjh Posted August 13, 2017 Share Posted August 13, 2017 Thanks for posting your find! Quote Link to comment https://www.bigmacktrucks.com/topic/50686-04-ac-460p-antifreeze-problem/#findComment-377372 Share on other sites More sharing options...
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