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Water blows out radiator immediately when started on D5

Discussion in 'Dozers' started by Missouri Darrell, Jan 23, 2022.

  1. Missouri Darrell

    Missouri Darrell New Member

    Joined:
    Jan 23, 2022
    Messages:
    1
    Location:
    Missouri
    I have an older D5 bulldozer. Before starting the dozer, I check the water in the radiator. It is full, I leave the cap off, start the doZer and it immediately blows the water out the top of the radiator, bad.....Why. Dozer has a new headgasket and a new water pump. Problem has not been fixed..
     
  2. Tyler d4c

    Tyler d4c Senior Member

    Joined:
    Mar 2, 2016
    Messages:
    1,039
    Location:
    Salix Pa
    Is the water pump just pushing the water out due to no thermostat or is it actually getting combustion pressure in it
     
  3. Delmer

    Delmer Senior Member

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    Jan 3, 2013
    Messages:
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    Location:
    WI
    Was the head pressure tested? head and block checked for flat?

    You could try filling the radiator back up to just above the fins, then starting again, sounds like combustion leak though, sorry.
     
    kshansen likes this.
  4. Tinkerer

    Tinkerer Senior Member

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    May 21, 2009
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    Location:
    The shore of the illinois river USA
    Welcome to HEF, Missouri Darrel !
    What happens if you leave the cap on after filling it and then starting it ?
     
  5. catman13

    catman13 Senior Member

    Joined:
    Aug 22, 2011
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    Occupation:
    refrigeration engineer/excavation contractor
    Location:
    oregon usa
    head gasket or cracked head, sorry not good news
     
    56wrench, kshansen and Nige like this.
  6. Dave Neubert

    Dave Neubert Senior Member

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    Monroe NC
    Sounds like a cracked head
     
  7. heymccall

    heymccall Senior Member

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    Feb 19, 2007
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    Location:
    White Oak, Pa
    How much water is it pushing out?
    On my D4H, it has no overflow bottle, therefore, it is only filled to the top of the square insert down inside the top tank.
    Could you have it overfilled?
     
    Tinkerer and Delmer like this.
  8. D5Dan

    D5Dan Well-Known Member

    Joined:
    Sep 29, 2021
    Messages:
    64
    Location:
    Oxford, Maine
    You mention installing a new head gasket and water pump...any work/rebuilding of the head? And as asked above, any pressure tests? Is this “older” D5 a pre combustion chambered head??
     
  9. d9gdon

    d9gdon Senior Member

    Joined:
    Feb 12, 2010
    Messages:
    1,446
    Location:
    central texas
    It's the seals on the pre-combustion chambers and/or pinholes in them caused from cavitation due to previous failure to keep the coolant conditioner additive up to date.

    Buy the tool on Ebay to unscrew the chambers to replace the orings and check the chambers closely for pinholes. Pretty cheap to fix.