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CATEGORY LISTINGS > DETROIT > 12.7 DDECV coolant pressure, oil trace in coolant [ REFRESH ]
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12.7 DDECV coolant pressure, oil trace in coolant


Created On Sunday November 22, 2015 06:50 Diesel Talk
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olered
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Joined: Dec 2008

Note Sunday November 22, 2015 06:50 View thread in raw text format
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I have a 12.7 DDECV(non EGR now) that has almost 800k. Over the past 6 months or so, I lose a gallon of coolant over the course of a month or so. No leaks, no contamination in coolant and oil samples are clean. Recently I've had a couple of minor leaks around the lower radiator hose clamps. Replaced hose and good clamps. When doing this it was discovered there is excess pressure in the coolant. With the engine mildly cooled down, when the cap was removed from the surge tank coolant came blasting out. Like a geiser.
So for the past month now I've been keeping a close eye on this. Now adding about 1/2 gallon per week of coolant. I'm not 100% certain yet that it is being pushed out of the surge overflow tube. I'm going to attach a bottle to see. Just the other day I saw a small amount of oil residue in the surge tank.
I was first thinking this was injector cups and O rings. Now with the oil appearing I'm not sure.
Any diagnosis I can do at home before I take it to the shop?
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BUTCH
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Joined: Jan 2009

Note Wednesday December 09, 2015 13:55 View thread in raw text format
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the radiator might be blocked if its over heating.but a hot engine will always shoot water out like that


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IM A 35 YR OWNER OPERATOR
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Brent
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Joined: Nov 2011

Note Wednesday December 09, 2015 17:43 View thread in raw text format
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Make sure you don't have a air water valve for the bunk. I don't think new trucks use them. Air compressor, head gasket.
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martink004
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Joined: Mar 2016

Note Wednesday March 09, 2016 16:50 View thread in raw text format
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I had same issue, it was taking 1/2 gal 7-8g miles and then it got shorter and shorter to 2500miles, it took almost a year otherwise truck did not exhibit any issue even oil samples were ok at 1/2 thru. it was head gasket water passage rubber gasket was getting completely disintegrate, and with small leak thru injector cup it will not show no white smoke in exhaust, also test you cap to be sure you got to be at manufacture spect, 14psi to some low as 8 psi. also get rad pressure tester and put it to 20 psi with cold engine and leave it for 3-4 hrs if does not drop leave it to next day and see where water went, if you do not see water outside of engine then it must go inside, one danger if it is leaking thru injector cup water can accumulate in cylinder and it might lock engine.

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martin p
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