1985 JD 1050 2WD Coolant Bubbles
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    1985 JD 1050 2WD Coolant Bubbles

    Coolant System. Flushed completely till ran clear, new hoses, new thermostat and gasket, new coolant, getting new rad cap today. This is the overfill tank. Video attached...

    Idled for 30-45min...no change. With cap off the water swells to top then pops the bubble. Over and over.

    With cap on and let pressure build, when remove cap you can here water settle back down in system with engine off.

    No water or oil mixture in either crank nor radiator.

    Unless it's a huge air pocketit looks to me like its air pumped in...

    I'm thinking head gasket...what say you?

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    Until you get 1/2dozen heat cycles or possibly more your looking for a problem that may not exist.

    After getting my injectors changed on my truck it took 2 weeks of daily driving to purge the air completely. This is the job of the overflow system. Just keep that bottle filled to the line and and see if it slows then stops taking in more fluid.

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    Sounds as if compression is entering cooling system from blown head gasket,cracked cyl head or leaking cylinder liner(cavitation).
    Gizmo2 likes this.

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    Quote Originally Posted by rydplrs View Post
    Until you get 1/2dozen heat cycles or possibly more your looking for a problem that may not exist.

    After getting my injectors changed on my truck it took 2 weeks of daily driving to purge the air completely. This is the job of the overflow system. Just keep that bottle filled to the line and and see if it slows then stops taking in more fluid.
    I see no correlation with changing fuel injectors & getting air in cooling system. Can you please explain their correlation? Was cyl head removed to change injectors?

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    1985 JD 1050 2WD Coolant Bubbles

    Quote Originally Posted by Tx Jim View Post
    I see no correlation with changing fuel injectors & getting air in cooling system. Can you please explain their correlation? Was cyl head removed to change injectors?
    Changing diesel injectors requires draining the entire cooling system, otherwise antifreeze will pour into the cylinders. The coolant path goes directly around injector sleeves.

    Gm duramax lb7
    Last edited by rydplrs; 03-23-2019 at 07:38 AM.

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    I'm not familiar with Chevy DM engine BUT sounds like poor engineering to me compared to all the tractors that can have the injectors changed without draining coolant.
    Last edited by Tx Jim; 03-23-2019 at 12:50 PM.
    dieselshadow likes this.

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    The symptom sounds like a head gasket to me. Usually if air can get into the coolant, then coolant can get into the oil. Take the filler cap off and see if there is a grey oily foam on it. If there is, then it's probably as you suspect.

    Al

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    Thatís a fairly rare setup to have the injectors be in direct contact with the coolant. Most are like spark plugs with a dedicated hole directly into the precups or into the cylinders.
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    Quote Originally Posted by dieselshadow View Post
    Thatís a fairly rare setup to have the injectors be in direct contact with the coolant. Most are like spark plugs with a dedicated hole directly into the precups or into the cylinders.
    There are cups, they are just prone to coming out with the injector.


    That said, my coolant system was drained, and it took a while to purge 100%.

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    Quote Originally Posted by Tx Jim View Post
    I'm not familiar with Chevy DM engine BUT sounds like poor engineering to me compared to all the tractors that can have the injectors changed without draining coolant.
    TxJim, unfortunately some of the newer Deere engines Have these sleeves the injectors fit into as well. The sleeve is sealed with orings. Most engines since they have gone to HPCR (high pressure common rail). Just one more area to worry about coolant getting into cylinders or crankase or loss through exhaust , not to mention egr coolers. Emissions garbage has turned a once simple engine design into an electronic, mechanical nightmare. Definitely not the case with a 1050 engine.

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