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Odd Engine Noise part 2, with video!

Discussion in 'LR4' started by Al Pizzica, Feb 2, 2020.

  1. Edward2595

    Edward2595 Supporting Member Supporting Member

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    My LR3 had an exhaust leak that sounded like that, quiet until I revved it up. Mine was actually leaking at the manifold to cat 3 bolt flange. I think it had shifted over time as there is no gasket between the two. Mine was consistent though or worse when cold and would get a little better as it warmed up because i think the exhaust pipe expanded which helped quiet it down.
     
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  2. Al Pizzica

    Al Pizzica Member

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    Yeah, that's a common noise in some of the earlier Jeep 4.0s. IF it was this that would be great because it means there's not danger to the engine and it's not that hard to fix.

    Update on my end. I got a mechanics stethoscope on Amazon. Pulled off all the plastic so that the throttle was exposed and sniffed/listend around.
    The only thing that went in time with the engine rev and sounded closest to it was when I put the metal rod of the scope on the fuel line crossover that runs across the top of the engine.
    I've never been more convinced that it's not something mechanical that's going to ruin the engine if it goes.
    Right now my theory is that one or more of the injectors is extra noisy and may die soon. We are going to keep it and see how it goes.
    That's not a terribly expensive job, is it? Replace all the injectors?
    Al
     
  3. scott schmerge

    scott schmerge Full Access Member

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    it’s not bad on injectors. About 4-5 hours. There’s a whole thread on it. Check out misfire thread.
     
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  4. Al Pizzica

    Al Pizzica Member

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    Update, engine now has small oil leak originating above the starter somewhere. Wonder if it's related?
     
  5. gleung

    gleung Member

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    Have you check crankcase ventilation valve?
     
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  6. JimDiscoveryngSE7

    JimDiscoveryngSE7 New Member

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    upload_2020-2-21_12-10-28.png

    https://www.google.com/search?q=engine+tappets&ie=UTF-8&oe=UTF-8&hl=en-us&client=safari

    Engine tappets is always what I’ve known that noise to be. I haven’t broken down a bosche but I have a Windsor and others. https://mechanics.stackexchange.com/questions/27066/what-are-tappets

    It is NOT the timing chain. No way. I can’t even begin to know I would never go back to that guy.

    I instantly think rapper in this case. I only think rapper but I’m not standing over the engine. I hope this will help you. If that was a Ford I’d be Correct. No doubt.
    —Needs a valve adjustment.

    Here is a video on set up:

    Note: Have you checked your PCV system? I believe that may be the cause, or exacerbating event/reason. ...Maybe, of course I include the disclaimer. Sorry.
     
    Last edited: Feb 21, 2020
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  7. Al Pizzica

    Al Pizzica Member

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    Thanks so much for both of these suggestions!
     

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