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New Water Pump Higher Temp?

Discussion in 'Early CJ5 and CJ6 Tech' started by Mr Plow, Jun 21, 2016.

  1. Jun 21, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    Hi All, I barely know how to use a wheel barrel but the other week my old water pump was starting to throw up antifreeze from the weep hole so I got a new pump and installed myself. I have two temp gauges. One in block and the other above the thermostat (brand new 185deg). Now with the new WP my engine temp creeps up higher (almost past the 'H') than before. At that point the thermostat finally opens. What would cause that? Is it simply lack of coolant? I have a cj5 1966. Should I even worry about this. Thanks guys!
     
  2. Jun 21, 2016
    uncamonkey

    uncamonkey Member

    Greeley CO
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    Thermostats do that cycleing thing when they warm up. As long as everything is good after it warms up, don't worry. I had two temp gauges on my 350 and it was interesting to watch how each side of the engine changed temps as you drove it.
     
  3. Jun 21, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Does the new thermostat have a weep hole? It needs one to keep air from being trapped.
     
  4. Jun 21, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    Hey guys thank you for the replies! Did you mean the new water pump having a weep hole? yes the new one does but smaller than the wep on the original. Yeah I thought if it does finally cycle that I would be fine. all new to me bUt enjoy learning about these vehicles thanks again for the input!!
     
  5. Jun 21, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    No the thermostat itself should have a little hole in the body of it to allow a bit of water through it. That will allow any air to be bled out plus it helps the water temperature to equalize so the thermostat will open when it should.
     
  6. Jun 21, 2016
    PeteL

    PeteL Member Sponsor 2019 Sponsor

    Hills of NH
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    The thermostat flange should have weep hole, to pass any bubbles and ensure the hot coolant actually reaches the thermostat.

    Also, after draining and refilling coolant, the system may need to be burped before it settles down.

    What engine is this?
     
  7. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    Ah, ok will check those flanges. I have the f 134 engine. How do you burp it? Just run then top off coolant after system cools back down? Thanks for the help
     
  8. Jun 22, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Generally that is all you should need to do.
     
  9. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    ok, start jeep. Engine heats up at idle and temp gauge goes all the way to H... thermostat does not open. Turn jeep off and start back up again - thermostat pops right open and engine begins to cool as it should. Any ideas what that might mean? Thanks guys!
     
  10. Jun 22, 2016
    timgr

    timgr Jeepin' Nerd Sponsor 2019 Sponsor

    Medford Mass USA
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    Air bubble cleared? Bad thermostat?
     
  11. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    How do I pop the bubble? Thermostat is 2 weeks old. Could crud from radiator get dislodged and block thermostat weep holes?
    This all happened after changing WP.
     
  12. Jun 22, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    Did you pull the outlet housing off and check the thermostat? It certainly is possible for crud to block the weep hole if there is one. Can you pull the thermostat out and post a picture of it for us?
     
  13. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    Will do, gotta run out for a bit but will post soon... Thanks!
     
  14. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    here is what I have...
     

    Attached Files:

  15. Jun 22, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    There should be a weep hole noticeably visible from the top when looking straight down at it. I don't see one but the picture isn't looking straight down at it either. If there isn't one just drill an 1/8th" hole through the flat part/flange and that should cure the problem.
     
  16. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    No there wasn't. So this only lets a trickle through to help 'alert' the stat to pop? Thanks for the info!
     
  17. Jun 22, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    That is pretty much it. Lets enough flow through there to let the temperature equalize and helps eliminate any air pockets. Also the thermostat should open and close smoothly/progressively.
     
  18. Jun 22, 2016
    Mr Plow

    Mr Plow Member

    Boston, Ma
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    Well I think that worked... I ran the jeep for a good 30 minutes the block temp did not climb past 3/4 and the upper temp (aftermarket gauge) did not go past 190.
    Thanks for the help!
     
  19. Jun 22, 2016
    Glenn

    Glenn Kinda grumpy old man Staff Member Sponsor

    Apopka, Fl
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    I love it when a plan comes together!
     

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