Head Gasket ?

Discussion in 'Ask An Owner Operator' started by Luke700, Jul 30, 2021.

  1. Luke700

    Luke700 Bobtail Member

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    When I take off my coolant cap theres high pressure and coolant splashes all over the engine. The truck doesn’t blow smoke. Oil don’t mix with coolant. Truck doesn’t overheat and it drives fine. There’s a few codes on the truck I haven’t scan yet. Besides the air compressor what else could cause this? Thanks
     
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  3. AModelCat

    AModelCat Road Train Member

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    Well the cooling system is pressurized so if you're opening the rad cap when the cooling system is hot (or even just warm) it'll spill out. Hotter it is, the more it'll spray.
     
  4. bad-luck

    bad-luck Road Train Member

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    The system is pressurized. Look at the top of your radiator cap. It will have pounds listed on it. For example lets say its 13lbs, it will hold 13psi , when it goes over 13psi it will come out the overflow tube. A sign of a bad head gasket would be, your pushing coolant out on the ground through the overflow tube, and having to continuously add coolant.
     
  5. Luke700

    Luke700 Bobtail Member

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    Sorry I meant to say the reservoir cap.
    sorry meant to say reservoir cap.
     
    Rideandrepair Thanks this.
  6. AModelCat

    AModelCat Road Train Member

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    Still pressurized.
     
    Rideandrepair Thanks this.
  7. Luke700

    Luke700 Bobtail Member

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    Appreciate it. Any ideas as to what might be the issue?
     
  8. AModelCat

    AModelCat Road Train Member

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  9. Antinomian

    Antinomian Road Train Member

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    What kind of engine?

    Does it have EGR? That's the most common source of excessive pressure if the engine has EGR. Do you see bubbles in the recovery tank when the engine is running?

    Are you loosing any coolant?

    Take an oil sample and check for coolant products (sodium and potassium) in the oil.
     
    Jarhed1964 Thanks this.
  10. Roberts450

    Roberts450 Road Train Member

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    Is the engine hot or cold when you’re taking the cap off.
     
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  11. ProfessionalNoticer

    ProfessionalNoticer Medium Load Member

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    Do a fluid test and see if it changes colors. Harbor Freight sells a kit to do it.
     
    feldsforever Thanks this.
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