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Coolant suddenly sucked into the oil

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Rockovert, Apr 28, 2020.

  1. Rockovert

    Rockovert Registered User

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    I recently replaced every gasket possible in my 7.3 idi and it was running perfect for about 2k miles. I started it up one day and all of a sudden, smoke went out my tailpipe and all of my coolant got sucked into the oil. Im hoping this isnt cavitation. I don’t know why it would be a head gasket considering i have studs installed. I dont see any external leaks either. Any ideas on what it could be, and easy tests for it?
     
  2. homelessduck

    homelessduck Full Access Member

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    I wouldn't think coolant would empty that fast from cavitation. Did you reseal the oil cooler?
     
  3. Rockovert

    Rockovert Registered User

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    Yes I resealed it as well. Would you think it would be that fast if it failed inside the cooler?
     
  4. Dane Rickford

    Dane Rickford Full Access Member

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    If your cooler failed, I would expect to see oil in the coolant, not coolant in the oil. This is because there’s around 50 psi for the oil, and only around 8-12 psi for the coolant in the cooler, therefore the oil would go into the coolant because it’s at a much higher pressure. At least that’s what happened to me
     
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  5. homelessduck

    homelessduck Full Access Member

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    It is possible for the coolant to get in to the oil from a failed oil cooler. I would start with a compression test . Is there coolant in any cylinders? How did the water pump backing plate look when you resealed it?
     
  6. homelessduck

    homelessduck Full Access Member

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    With it leaking in to the oil that fast my guess is the water pump plate.
     
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  7. Rockovert

    Rockovert Registered User

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    I havent done a compression test, so ill do that first and then maybe this weekend i can take the water pump out again and take a look, but the plate behind the water pump looked fine before.
     
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  8. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    Unfortunately, with smoke suddenly coming out of your exhaust, I think that the oil cooler isn't very likely.
     
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  9. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    Oil cooler won’t do that, head gasket, head issue or cavitation.
     
  10. homelessduck

    homelessduck Full Access Member

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    I missed the smoke part and for it to be the oil cooler it would usually only happen when the engine is off ( 0 oil pressure but cooling system is still pressurized) , so scratch that. Luckily it didn't hydrolock and cause more damage.
    Wouldn't cavitation take longer to empty the cooling system since it's only pinholes? I would think it would have to be a pretty large leak to empty that fast. A leak down test of each cylinder at tdc and again at the bottom of the stroke would help determine if it's cavitation.
     
    Last edited: Apr 29, 2020
  11. Black dawg

    Black dawg Registered User

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    Does it still run? I have seen a couple drop valves and knock out the cylinder wall. THat will fill the crankcase with coolant real fast......wont suck it in there though?
     
  12. Rockovert

    Rockovert Registered User

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    Yeah it still runs, at this point im just gonna pull the motor again and take it all apart to see
     
  13. Rockovert

    Rockovert Registered User

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    Update: had the motor apart and took everything to a machine shop. Rip my project, both heads are cracked and are no good. I dont know where to go from here.
     
  14. BeastMaster

    BeastMaster Full Access Member

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    Last edited: Jun 24, 2020
  15. Rockovert

    Rockovert Registered User

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    No idea on how it happened, its a big bummer, happened randomly on a cold start
     

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