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D6h series 2

Discussion in 'Dozers' started by 4730, Sep 30, 2021.

  1. 4730

    4730 Well-Known Member

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    Have a 1990 d6h series ii the darn engine is heating after an hour of working it. Was working perfect last week but all of a sudden getting to warm. Goes to 210 on gauge. was always at 180 before. Transmission is staying at 170. Can water pump be going? It will cool off in 2 minutes is let stand and high idle. Rad is clean outside. Belts tight on fan.
     
  2. JD955SC

    JD955SC Senior Member

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    could very well be

    shoot top and bottom of radiator with IR temp gun and if more than 10 degree temperature difference there is an issue…and will likely be. Can be water pump, or internal clogging, or a combo of both especially talking about a 30 year old machine.

    Also check your radiator cap and replace if necessary. if it doesn’t hold pressure it can cause overheating. It’s the $15 part that gets overlooked a lot but can make a real difference.
     
  3. 4730

    4730 Well-Known Member

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    We put thermostat in Pot of hot water brought temp up to 200 never opened. Took a screw driver and pushed open. Now it seems to work once water hits 180. Wonder if that is the problem will be putting new one in.
     
  4. JD955SC

    JD955SC Senior Member

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    toss it and install new, sounds like it’s probably the issue. Another part that can cause headache far out of proportion to its cost.
     
  5. 4730

    4730 Well-Known Member

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    Going to order new rad cap to thanks
     
  6. JD955SC

    JD955SC Senior Member

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    Good deal let us know if those two items fix your issue.
     
  7. catman13

    catman13 Senior Member

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    check and see if you have bubbles in the radiator , you may be losing a head gasket.
    my d5h did the same thing , head gasket
     
  8. 4730

    4730 Well-Known Member

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    If it is a head gasket how bad of a job is that?
     
  9. catman13

    catman13 Senior Member

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    i sent it to my cat dealer , did not have time to do it , had them go thru the head while it was off,
    if you are good at wrenching not to bad , if you have a shed to nose it into to keep it out of the weather while you do it
     
  10. 4730

    4730 Well-Known Member

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    Well I guess the head is Going to have to come off. Hopefully just a gasket. After 10 min warm up air bubbles in rad.
     
  11. catman13

    catman13 Senior Member

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    mine was just a gasket , sounds like that is all you have to to do also, have the head gone thru while you are at it
     
  12. 4730

    4730 Well-Known Member

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  13. Nige

    Nige Senior Member

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    From the state of the ferrules that seal the coolant passages it doesn't appear as though it got extremely hot otherwise they would look wrinkled and shrunk. That being the case I wonder why the head gasket failed.?
     
  14. Bluox

    Bluox Senior Member

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    What does the head look like?
    Pull the spacer plate and gasket.
    Bob
     
    Last edited: Oct 8, 2021
  15. 4730

    4730 Well-Known Member

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    Wonder if just old age machine 1990. The thermostat was sticking to
     
  16. 4730

    4730 Well-Known Member

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  17. Bluox

    Bluox Senior Member

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    That is what I thought I saw, you have a problem with that liner or the block.
    Lets see the head and pull the spacer plate.
    Bob
     
  18. 4730

    4730 Well-Known Member

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    Sorry not sure what the spacer plate is? Not sure why it looks like three groves to top of cyl. When you use fingernail you don't feel them.
     
  19. Bluox

    Bluox Senior Member

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    You see the damage on top of liner above the scratches?
    Spacer plate is between block and head gasket ,pull off gasket and plate will come off block.
    Bob
     
  20. 4730

    4730 Well-Known Member

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    Haven't had a chance to pull spacer plate off yet. Is there a gasket for that spacer plate to? What seals it?