Blown head gasket??

Discussion in 'Ask An Owner Operator' started by wadeenterprisesllc, Apr 19, 2024.

  1. wadeenterprisesllc

    wadeenterprisesllc Bobtail Member

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    Coolant bottle absolutely CHURNS when I rev the rpm’s up. Combustion test came back negative for exhaust in coolant…new bottle, hoses, radiator, and water pump last year! EGR is dry as a bone. Thermostat stuck open maybe??
     
    Rideandrepair and Tug Toy Thank this.
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  3. lester

    lester Midwest's #1 Feed Hauler

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    What truck? What engine?
     
  4. wadeenterprisesllc

    wadeenterprisesllc Bobtail Member

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    2015 Cascadia DD15
     
  5. Opendeckin

    Opendeckin Medium Load Member

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    Could be the air compressor if there's no combustion gases
     
  6. wadeenterprisesllc

    wadeenterprisesllc Bobtail Member

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    I also wondered that but wouldn’t air compressor push the coolant into the overflow from the high pressure?
     
    Rideandrepair Thanks this.
  7. wore out

    wore out Numbered Classic

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    Look for black specks floating around in coolant. If you have them it’s a sure sign of combustion gas. The combustion gas kit has been known to lie on all makes all models
     
    Ssgtkevin, W923, Deere hunter and 6 others Thank this.
  8. AModelCat

    AModelCat Road Train Member

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    Those combustion leak testers are trash IMO. Never had one work yet. Even a little Perkins with a 1" long crack between the valves didn't make it change colour.

    I'd rule out the air compressor first.
     
  9. Rideandrepair

    Rideandrepair Road Train Member

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    My 12.7 did the same thing. No bubbles or excessive pressure at idle. Increased with RPMs. Coolant would blow out overflow while running to a point, then quit. Meanwhile it was also leaking into oil pan. It will separate and settle on the bottom. Might want to let it sit a little while. drain a bit, see if there’s any coolant in oil.
     
    Jordonh and wadeenterprisesllc Thank this.
  10. Antinomian

    Antinomian Road Train Member

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    Are you losing coolant?
     
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