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High coolant reservoir pressure

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jrairman1, Aug 9, 2023.

Page 2 of 4
  1. Aug 9, 2023 #11
    Jrairman1

    Jrairman1 Bobtail Member

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    Aug 9, 2023
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    No oil in coolant very clean
     
    Jrairman1, Aug 9, 2023
    Jrairman1, Aug 9, 2023
    #11
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  3. Aug 9, 2023 #12
    lester

    lester Midwest's #1 Feed Hauler

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    I'm not familiar with the DD but I've blown several head gaskets on a cat and only symptoms I ever had was pushing coolant. No other problems. At least until it really let loose and then I was burning and mixing coolant at a rapid pace
     
    lester, Aug 9, 2023
    lester, Aug 9, 2023
    #12
    Rideandrepair Thanks this.
  4. Aug 9, 2023 #13
    Jrairman1

    Jrairman1 Bobtail Member

    13
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    Aug 9, 2023
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    Jrairman1, Aug 9, 2023
    Jrairman1, Aug 9, 2023
    #13
  5. Aug 9, 2023 #14
    Jrairman1

    Jrairman1 Bobtail Member

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    I'm leaning toward head gasket, just wish I'd know 100% that that's what it is, either thru a positive test or something, I think the bubbling once the thermostat opens from overflow tube into a water bottle is the sign, I've eliminated all other things that produce air or that can introduce pressure into coolant system, I just don't want it to be that, I guess is why I'm so hesitant
     
    Jrairman1, Aug 9, 2023
    Jrairman1, Aug 9, 2023
    #14
    Rideandrepair Thanks this.
  7. Aug 9, 2023 #15
    Gridaxe5588

    Gridaxe5588 Light Load Member

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    Nov 23, 2022
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    Did you get an OEM or aftermarket coolant reservoir? Also when you shut down is the top hose collapsed the next morning?I got an aftermarket from the Freightliner dealer to replace my cracked one and I've had that problem since I replaced it and never did before.i think the caps are the issue not 100% for sure but to remedy it I just loosened the overflow cap a little bit and don't have any issues.2016 DD13 with 806k
     
    Gridaxe5588, Aug 9, 2023
    Gridaxe5588, Aug 9, 2023
    #15
    Rideandrepair and Magoo1968 Thank this.
  8. Aug 9, 2023 #16
    ‘Olhand

    ‘Olhand Cantankerous Crusty

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    Jan 18, 2011
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    I’ll take head gasket for 200 Alex
     
    ‘Olhand, Aug 9, 2023
    ‘Olhand, Aug 9, 2023
    #16
    Rideandrepair and Last Call Thank this.
  9. Aug 9, 2023 #17
    Jrairman1

    Jrairman1 Bobtail Member

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    Aug 9, 2023
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    If I leave the top cap a little loose which I've tried, coolant then overflows from it, instead of side releave cap, the hose doesn't collapse next morning still has some pressure, hose isn't real hard but probably holding 5 psi or so, I did buy aftermarket one from fleetpride, half the price,
     
    Jrairman1, Aug 9, 2023
    Jrairman1, Aug 9, 2023
    #17
    Rideandrepair Thanks this.
  10. Aug 9, 2023 #18
    Jrairman1

    Jrairman1 Bobtail Member

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    Aug 9, 2023
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    Lol, I know I know, just wish i knew 100%, it's an expensive and time consuming task, plus alot of one use items I need to get, like fuel lines, head bolts ect, not just gasket which alone is 400$
     
    Jrairman1, Aug 9, 2023
    Jrairman1, Aug 9, 2023
    #18
    Rideandrepair and ‘Olhand Thank this.
  11. Aug 9, 2023 #19
    Gridaxe5588

    Gridaxe5588 Light Load Member

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    Nov 23, 2022
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    Been running mine with side cap loosened for over 100k now, had 2 oil analysis's done since and absolutely no problems. I'd try the side cap if I were you just to eliminate one more thing.
     
    Gridaxe5588, Aug 9, 2023
    Gridaxe5588, Aug 9, 2023
    #19
    Rideandrepair Thanks this.
  12. Aug 9, 2023 #20
    Antinomian

    Antinomian Road Train Member

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    Feb 17, 2013
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    One more clue might be the relative compression test in the DDDL software. There are other things besides a leaking head gasket that can cause a cylinder to lose compression. But you can at least verify that it is happening.
     
    Antinomian, Aug 9, 2023
    Antinomian, Aug 9, 2023
    #20
    Rideandrepair Thanks this.
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