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coolant pushing back thru reservior tank cap.

Could this be a possible egr cooler starting to get plugged ? Any thoughts would be helpfull. Thanks

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The first thing to do is find out if there are combustion gases in the coolant being pushed back. There are test kits for that, but I just bought the test fluid and ran the reservoir tube into a coke bottle filled with the fluid. I couldn't fit the test kit onto my reservoir tank because where it was mounted was only an inch or two from the frame and it wouldn't fit. I left the radiator cap on. My fluid did NOT change color, indicating there were no combustion gases. These fluids come in two different versions, one for gas and another for diesel engines.

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it can indicate a blown head gasket also

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Air compressor might be feeding air pressure into water system through a bad compressor head gasket also.

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Sounds reasonable to me -- is there a way to eliminate the air compressor out if the eng system --?? About an $800 fix --my problem don't fit the egr cooler , or a gead gasket --the engine runs too good for that--

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I have the same issue . Coolant pushing out thru the bleeder hole .re built the whole engine. And still coolant is pushing out of the bleeder hole in the radiator cap. Does anyone have any other suggestions ???? Please help

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The first thing to do is find out if they are combustion gases. There are test kits for that, but I only bought the test fluid and ran the reservoir tube into a Coke bottle of the fluid. The test kit wouldn't fit onto my reservoir tank because it was only an inch or two from the frame. I left the radiator cap on. My fluid did NOT change color, indicating there were no combustion gases. These fluids come in two different versions, one for gas and another for diesel engines. I had my cap tested at AutoZone and it was good, but I bought a new one anyway. That didn't fix it. I bought an infrared thermometer and checked the temperature at the top and the bottom of my radiator and also the engine temp on both sides of my thermostats. I have a Cummins 6CTA 8.3 diesel and it has two thermostats in the same housing and it's easy to get to with the infrared thermometer. You can get a good idea if the water is circulating properly.

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make sure you have the correct pressure radiator cap. Check with the engine people for your engine, to verify that you have the correct cap, cheap fix if it is the wrong one.

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This was an issue with my truck this past week. Wrong cap. Buddy was saying it was head gasket.Eliminate small things first.

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Do the simple things first--ck the thermostat -the egr sensor and or the egr actuator for leaks --if a plastic tank it could have a hole that only opens up under pressure--be carful some of the shops try to see how high they can run up your bill---the brag about it--

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Fixed it with a new radiator, oil sample ck, fixed all the rotten hoses--pressure cked at 16 psi for over 10 hrs--egr cooler no leaks --problem solved--

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Well another good way to test and see if you have a blown head gasket or pin holes in your liners etc.Is to get a combustion in coolant tester this is a liquid that goes into a clear tube you remove surge tank cap then put the tube in hole in place of cap you watch when combustion gases are present in the coolant the liquid will turn from a blue to a yellow. Typically things that can cause combustion in coolant is egr cooler pin holes in liners, bad injector tubes or copper cups. cracked head or block. When the air compressor goes bad or head gasket on air compressor. there will be no combustion gases in coolant. as everyone has stated i would start with simplest first go from there. but this tool can help you in process of elimination. Also tool is only 20 to 50 us dollars

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This happened to me right before I blew a head gasket. It ended up being a crack in the top of the block due to cavitation. My motor is a 1998 Series 60 Detroit

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mine will do this if i overfill the radiator...its happy (07 INTL with an ISX) with the coolant inbetween the full and add...

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I have a 2000 model International with a 60 with a Series Detroit. When mine did this I started with a simple Radiator Cap to see if that would cure me it didn't. Turned out to be a bad head gasket it can mean and new motor in some cases as well. First get an oil sample to see if you have coolant in your oil / heavy metals etc and go from there.

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Good recommendation --trouble shoot first before we run up the bill and still not have it fixed!

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Have a compression test on the engine. It could be cracked head, head gasket or pits on a liner.

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I have a cat c-13

when this happen to me it was a cracked head.

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07 isx here also. coolant level likes to stay between top and bottom window on overflow jug. anytime i fill the jug it spits it back out.

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I have a 2000 Model International and I was told you only to fill to sight glass or a little above is ok. It is a surge tank and you must leave room for expansion.

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I have had this problem on an 07 Freightliner with a Detroit Series 60. It turned out to be the several things, all of which were covered under warranty (lucky me). The head gasket was blown due to a rookie driver who drove on I-70 west of Denver, CO against my previous employer's policy. In addition, the coolant reservoir didn't hold pressure, and would spray coolant onto the windshield or into the engine compartment. Some got into the turbo and EGR systems, causing even more damage.

The engine would also "cough," especially under heavy loads, and I would have to add at least a gallon of coolant every 2 days until the issue was fixed. The truck was in the shop for nearly a week, and ended up getting an inframe.

It is possible that it could be an EGR cooler, but it could also be v-pods (on Detroits), the EGR valve and actuators, or even a bad head gasket or water pump. As Kevin says, EGR engines are complicated enough that many "techs" simply throw parts at the problem instead of finding the root cause, and sometimes problems like this are "fixed" by getting rid of EGR entirely. A 5EK CAT is much easier to troubleshoot than an EGR Detroit, much less an ACERT C15 CAT.

It seems many companies don't teach drivers how to "drive by the gauge" these days, even specifying trucks w/o Pyrometers and boost gauges, but "driving by the gauge" is an essential skill to minimize the chance of engine malfunctions like yours and to get better fuel economy. I hope this helps you start troubleshooting and you get your problem solved.

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My problem doesn't do any of these--engine doesn't cough or loose power at all --

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Do you think the water pump could be the problem?

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when i had this problem it was a leak in my egr cooler. 2008 isx. sometimes it would suck the water back over. it will start leaking more and more coolant.

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I start whit same problem the past monday . Dash show low coolant level. So when i went to open the tank, coolant went back to right level . No coolant needed . So week ago i saw coolant was at minimun level and i add some. Provably thats reazon why start such mather. Any way today morning i drained the whole tank . And reservoir compartment remain full. So i refill at lower minimun level and start driving afew milles ahead low coolant light comes on for several miles and then went out viself . Coolant level still good now. Hophully it was a air buble at tank. Other wise can be someting as head gasket or egr sistem .i will see

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Did an oil sample -- no coolant in oil-- no fuel in oil-sample was good--replaced the radiator--problem solved --

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I had this problem to a slight extent and finally discovered an imperfection in the recovery bottle cap plastic seat as if someone had taken a flat head screw driver and tapped lightly with a hammer to allow coolant to flow past the cap seal and out the overflow tube just like a weak cap would do. Sanded it down smooth and problem solved. If head problem, drop the overflow tube into a cup of water. If steady air bubbles come out, bad news.

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What engine do you have? Why would there be bubbles? How does air come in? Or is it air?

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I have a Cat C9. Bubbles would indicate a blown head gasket as the cylinder pressure from combustion pushes exhaust into the coolant and will escape in the path of least resistance which would be your overflow tube. Hope this helps.

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Hi burgdorf

I have the same problem but I did an overhaul 22 months ago.replaced gasket,pistons,rings,bearings,etc.what could be the problem now?

Any help will be appreciated

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Hey burgdorf

I did the overhaul due the bubbles in the coolant tank ,coolant was pushed out .22 months later I have the problem again.that will be a blow head gasket or something else,if so why the blow head gasket again?

Thanks

Albert

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Back to square one. Who did your engine job? Possibly a cylinder liner not seated properly, that is, not protruding up into the head gasket enough to maintain the combustion seal. We're talking thousands of an inch adjustment in this area. Pittsburgh power recommends setting the liner slightly higher then factory settings on the bit Cat motors, not sure about Detroits.

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Can I put a 7 pound readitor cap on a 06 479 Pete

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I have 05 freightliner columbia detroit engine s 60 and I overhauled mouth ago it was running great but I get one problem the problem is there is more pressure on my coolent tank I loose all my coolent when I put the radiator cap because of the pressure help

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Hello Cilmicmc

Did you find the problem on this matters?

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Cked not the problem

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ben bodman will be eternally grateful.
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