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Help Understanding Leakdown Results

Discussion in 'Early CJ5 and CJ6 Tech' started by Militarymetal, Jun 9, 2024 at 7:13 PM.

  1. Jun 10, 2024 at 9:28 PM
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,420
    Yes, definitely pull the head. I suggest at least loosening all of the head bolts (just break them loose) and anything else that will be hard to break loose before pulling the engine.
     
  2. Jun 10, 2024 at 10:52 PM
    jeepdaddy2000

    jeepdaddy2000 Active Member

    Eagle Point oregon
    Joined:
    Jun 24, 2004
    Messages:
    1,251
    Those numbers are a lot better than the last set you posted.
    That being said, where is the air leaking? Do you get air movement out of the crankcase?
    Intake?
    exhaust?
    If you have some leakage at the valves, then replacing a head gasket should include at least lapping them while it is off. I'm not trying to instigate mission creep, but that is a really good time to check them if you suspect them.
     
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  3. Jun 11, 2024 at 7:17 AM
    Militarymetal

    Militarymetal Member

    Gainesville, Florida
    Joined:
    May 30, 2024
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    71
    Since the jeep sat for a while I have no clue why it wasn’t being used. I have to assume the engine was giving the owner a problem. I think the air was escaping through exhaust valves—just a guess. I’ll know better when I pull the head. Might as well do things right. Unless I spot something really amiss in the lower end, the engine shouldn’t need a rebuild. Lap the valves, new head gasket and call it good. I suppose the worst thing would be crack between 3 and 4. Fingers crossed it’s not that.
     
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  4. Jun 11, 2024 at 7:47 AM
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Aug 3, 2003
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    9,928
    It's a slippery slope. Often it's hard to to avoid one thing justifying another, and then it's a financial rabbit hole.
     
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  5. Jun 11, 2024 at 8:08 AM
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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    Nov 22, 2003
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    8,162
    They're no noted for doing that so you're probably good there. :)
     
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  6. Jun 11, 2024 at 8:53 AM
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
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    Yep, if you don't do everything needed you'll regret it soon enough.
     
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