ISX CM871 Oil In Coolant

Discussion in 'International Forum' started by CraigInReston, Apr 17, 2022.

  1. CraigInReston

    CraigInReston Light Load Member

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    Hi guys. Just recently started getting a skim of oil in my surge tank. Coolant hoses are now getting soft and sweating an oily residue. Everything seems to point towards the oil cooler. My question is: How do you verify it is in fact the oil cooler? I was thinking of removing oil filter, then pressurizing the coolant system with air at the surge tank, looking for coolant loss from the oil filter head. Cross contamination could be coming from any number of areas: air compressor, turbo, water pump, head gasket etc. Any other suggestions towards testing would be appreciated. Would really suck to replace, then find out it's a head gasket.
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    You normally see the sweating and soft hoses after fuel has been in it a while, not so much with oil.

    Either way, if it's oil, as you stated, the oil cooler is most likely. Don't rely on the cross contamination theory.

    If it's fuel, it'll be injector cups.
     
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  4. Dave_in_AZ

    Dave_in_AZ Road Train Member

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  5. Heavyd

    Heavyd Road Train Member

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    You would have to remove the oil cooler to pressure test it.
     
  6. Smellfunny

    Smellfunny Road Train Member

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    We made up some plates to test them with. Took some plates and drilled a hole in one of them and then welded a tire valve stem in the hole. Basically the same design for our charge air cooler tester. But with the charge hoses necessary to connect to cooler and a pressure gauge : )
     
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  7. CraigInReston

    CraigInReston Light Load Member

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    Hi HeavyD. I made my own test plates and submerged in water with 100psi air pressure. No leak in element at all. The gaskets looked a little sketchy, so I’m hoping with all new gaskets, the leak is fixed. Any other suggestions what to look for, if this doesn’t correct the issue?
     
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  8. Smellfunny

    Smellfunny Road Train Member

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    I have seen the cooler be good and the gaskets leak plenty of times. Been a while since I did one but there is something about sealer or something that goes on the bolts that hold the cooler on to the plate if I remember correctly.
     
  9. Heavyd

    Heavyd Road Train Member

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    Yes, the gasket is the likely failure point. If it were me, I would replace the element regardless due to age and for the simple reason you have it apart now away.
     
  10. God prefers Diesels

    God prefers Diesels Road Train Member

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    Correctomundo, as long as it's the stainless cooler. Quickserve says to not replace a cooler that's not leaking, however I agree with @Heavyd . You've already got it apart, and coolers are cheap. Replace it.

    Capture18.PNG
     
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  11. CraigInReston

    CraigInReston Light Load Member

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    Hi HeavyD. Truck is back together, even painted all the components so it looks like a brand new engine (on one side! Lol!) Yes, it appears that it was only the element gaskets that failed. Thanks for the advice! Now a new problem. I had the fault code for throttle position sensor below limits, losing response. Just let off throttle for 5 seconds and power came back. It did this randomly several times, while under heavy boost. Then, problem went away. I bought whole new pedal (as the old one was pretty corroded.) Tried doing the 3 depression slowly calibration, but now have no throttle response and both check and stop engine lights on. I had several faults on dash that disappeared, and now says “ no faults”. What’s going on here?
     
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