Detroit s60 14l coolant overflow

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Roadking96, Mar 4, 2021.

  1. Roadking96

    Roadking96 Light Load Member

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    01A565FC-1374-4FB8-A52A-E831CDD2AC95.jpeg FA596985-C3BA-4A71-8708-AA2D5CD0BE21.jpeg I got 09 westernstar with ddec vi Detroit s60 14l.lately it started pushing coolant out of the reservoir.loosing about gallon a day.so far no coolant in oil.no visible leaks.EGR cooler is welded up so no white smoke.truck is not overheating and runs fine.so far i did the combustion leak test with leak tester kit.the fluid turned green which indicates there’s exhaust gases in an engine’s cooling system.but i also did the bubble test but found no bubbles at all.i know the EGR cooler is cracked internally that’s why i welded up before.now even the EGR being non functional can the exhaust still leak into EGR cooler and cause pressure build up in the cooling system??i want to rule out the EGR cooler before i tear down the engine for possibly bad head gasket.any suggestions or other tests i can do to rule out that its not head gasket??
     
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  3. MRMTRANS

    MRMTRANS Light Load Member

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    Apr 28, 2015
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    I would think if coolant leaks from the EGR cooler into the exhaust going back into the engine cylinders, it would still be isolated from the cooling system, So any coolant lost there wouldn't go back into the overflow reservoir. Compression can push coolant back from a leaky head gasket and thru a injector cup seal, I think. It might be that it only happens when compression increases as the engine is put under load,
     
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  4. Don379

    Don379 Medium Load Member

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    Unless something changed wit these new emissions junk engines, i dont see how a headgasket could fail. IT would have to be a cracked head or a warped head imo.
     
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  5. MRMTRANS

    MRMTRANS Light Load Member

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    Yes, I forgot to mention a cracked head. Too low of liner protrusion can eventually lead to leaks at the head gasket.
     
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  6. Don379

    Don379 Medium Load Member

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    that something for sure with low liner protusion. Sorry
     
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  7. Roadking96

    Roadking96 Light Load Member

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    It seems to do it more while under load.my last run was out to west coast and it would throw low coolant light while pulling hills.i guess it time to tare it down and see what we got going on
     
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