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Head gasket leak?

Discussion in '4th Gen 4Runners (2003-2009)' started by rracraa, Jan 23, 2023.

  1. Jan 23, 2023 at 11:43 AM
    #1
    rracraa

    rracraa [OP] New Member

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    Looking for suggestions in which direction to go with this. Back story is I did a coolant flush a week ago and noticed infrequent bubbles from radiator after bleed. I’m at 200k miles now with no misfire, no CEL, no white smoke or sweet smell. No loss of coolant and engine essentially runs flawless at this point. I want to catch a potential problem before I overheat it and warp a head or burn out a valve.

    I went for a leak down test and cylinder 1 is 18% and 2 is 20%, all others are 15%.

    The tech didn’t note where the leak might be from but said it’s “in spec” and said head gasket looks good. I’m following up with them to get more info on their findings since they didn’t note any other details about leak.
     
  2. Jan 23, 2023 at 10:01 PM
    #2
    negusm

    negusm New Member

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    Get a coolant test that turns color if there are exhaust gases in the coolant. Cheap and easy to do. If no color change, your head gasket is AOK.

    Not sure what those percentages mean....they should be in PSI. If you paid for a test, you should get wet and dry numbers...otherwise, what's the point?
     
  3. Jan 23, 2023 at 11:17 PM
    #3
    rracraa

    rracraa [OP] New Member

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    I did a block test, fluid stayed the same color but there aren’t a lot of bubbles


    As far as I know, the leak down measures percentage lost under constant pressure vs a compression test (wet or dry) measures psi attained during crank.
     
    Last edited: Jan 23, 2023
  4. Jan 24, 2023 at 8:21 AM
    #4
    negusm

    negusm New Member

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    Oh, I see. Sounds like a healthy engine. Just don't allow it to overheat.
     
  5. Jan 24, 2023 at 8:42 AM
    #5
    steelevo

    steelevo New Member

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    The last time I did a coolant change, I used a vacuum coolant filler. It pulled all of the coolant from the system and was able to test for any leaks by being able to hold a vacuum. Then, it fills the system super fast without a mess. No bubbles once the system has been burped.

    I think that some of the older Toyotas do have a bleed valve on the thermostat housing to manually burp the system.
     

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