392 Runs HOT! Boils Over :(

Discussion in 'General IH Tech' started by J.J., Sep 17, 2020.


  1. J.J.

    J.J. Lives in an IH Dealership

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    Suggestions Please.

    Here is the link to my thread:

    http://www.binderplanet.com/forums/...2nd-rebirth-of-my-junkyard-dog-75-200.144917/

    1975 200, Short background, I put a 392 in that I had in a junker, PO told me it had come out of a Loadstar wrecker that had rolled. Compression was around 130 in all the holes. I swapped out the massive oil pan and oil pump, new rear main and freeze plugs, new seals/gaskets and it was properly pre-oiled. It starts and runs great, no issues there. When replacing the freeze plugs I did note scale in there like he had ran straight water and let it sit. I did take my shop vac and sucked out all the reachable scale. I also got two jugs of ThermoCure (made by Evaporust) and let it sit in there for a week and a half. I also put a piece of panty hose on the inlet side of the radiator to catch scale. But it will not run more than 2 miles before overheating to the point of a boil over. No water in the oil, I've replaced the thermostat and swapped radiators. Water pump had about 6000 miles on it so that is the only thing at this point that has not been changed out. No more real amount of scale in the water. Also the fan shroud in place.

    What am I missing????

    JJ in TN
     
  2. mongocanfly

    mongocanfly High Wheeler

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    could you take the top hose off and stick it out over the radiator ..crank it to make sure you got flow? ...assuming you have straight water in it
    been a long time since ive been inside a IH engine..but could it have the wrong intake gasket on it that might be blocking a port...I know on sbc that is a issue with some engines when changing heads and such
     
  3. J.J.

    J.J. Lives in an IH Dealership

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    Greg, pretty sure I do but that is a great thought! I did feel the radiator get warm like it had some sort of flow, but will step outside and try that.

    Thanks, Ill post back..

    JJ in TN
     
  4. RBS

    RBS Farmall Cub

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    Radiator hose collapsing under suction as engine/pump RPM increases? Are the hoses new? Delamination does occur in hoses.
    Rodger
     
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  5. J.J.

    J.J. Lives in an IH Dealership

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    Hoses not new but not old either. The top one for sure not compressed and I didn't notice the bottom one, I think I have another set, will also swap those out. Thanks for the thought.


    JJ in TN
     
  6. jeff campbell

    jeff campbell Lives in an IH Dealership

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    Hate to say this but maybe run another compression test.
     
  7. gibby

    gibby Farmall Cub

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    Are you using the right kind of thermostat with the necessary bypass cup on the bottom? If not you will not be flowing properly through the radiator.
     
  8. J.J.

    J.J. Lives in an IH Dealership

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    Yes, that would reveal a blown head gasket, Ill do that too.

    JJ in TN
     
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  9. J.J.

    J.J. Lives in an IH Dealership

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    Yes sir, its a Robertshaw, I swapped in a spare one that I had and it didn't change the issue.

    JJ in TN
     
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  10. J.J.

    J.J. Lives in an IH Dealership

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    I thought about that too when I changed the intake. Since I haven't made a scrap run yet I should still have the old one, another thing to check.


    I popped the top hose and put three gallons of water in it. It started to trickle at 1st like when it was opening up, then it started spurting, I realized it probably was low on water so I added another gallon and a half. Not sure if this flow is good or not?


    [​IMG]

    Any thoughts on running CLR thru it?


    JJ in TN
     
  11. Don B

    Don B Binder Driver

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    Maybe the rad is plugged up so you are only getting partial flow? I guess the engine itself could still be gunked up too. I haven’t tried this but I heard that you can add dishwasher detergent to the cooling system and the drive around to loosen up gunk.Then drain and flush. You could also try removing the thermostat to see if it still overheats. I use a infrared thermometer when checking engine cooling system temps, it helps with tracking this stuff down.

    Don B
     
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  12. J.J.

    J.J. Lives in an IH Dealership

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    This is the 2nd radiator that I have tried, so I don't think that is the issue, the some on both. I like the dishwasher detergent idea.



    Any thoughts on trying to back flow the motor?


    JJ in TN
     
  13. Don B

    Don B Binder Driver

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    Why not, you could even use a water hose first. I would be careful about the heater core though. Maybe block it off and flush it by itself. No point in wrecking it.

    Don B
     
  14. Chris Cooper

    Chris Cooper Binder Driver

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    Is the "spring" in the lower hose?
     
  15. mongocanfly

    mongocanfly High Wheeler

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    if that's the flow while running , it sure don't look like much
    Dad used cascade to help flush his out
     
  16. winchested

    winchested Y-Block King

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    Pressure tested the rad cap?
     
  17. J.J.

    J.J. Lives in an IH Dealership

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    Yes, this is as good as it got.

    How much Cascade? I bought a box.

    thanks,
    JJ in TN
     
  18. J.J.

    J.J. Lives in an IH Dealership

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    Checking.

    JJ in TN
     
  19. RinTX

    RinTX High Wheeler

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    I think I used a cup or more. Mix into a bucket of water and pour into system
     
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  20. jeff campbell

    jeff campbell Lives in an IH Dealership

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    Also HEARD mean green works good
     

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