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Thread: Noise in front of 3.8L engine with 130K mi

  1. #1
    M100C
    Guest M100C's Avatar

    Default Noise in front of 3.8L engine with 130K mi

    All,
    We've got a 2005 Dodge Grand Caravan with the 3.8 L engine and 130K
    miles. When the engine is at normal operating temperature and idling
    under a load (the transmission in D and holding van with brake), there
    is an intermittent knock/clatter from the front of the engine (sound
    like spark knock). Here what I know:

    1) it is not a collapsed lifter; the noise is too low, not as sharp as
    the ticking of a lifter and is irregular;
    2) it seems to be tied to engine speed. While the noise is irregular,
    the frequency increases with RPM;
    3) when the transmission is disengaged (shifted to P), the noise is
    significantly reduced.

    Sounds like it is coming from the timing chain / water pump area. I
    am a pretty fair mechanic, but before I tear into this, I'd like to
    know where the engine is predisposed to certain issues other mechanics
    may have seen, with these symptoms and miles. What are your thoughts?

    Thanks in advance,
    Chris

  2. #2
    ulas c coskun
    Guest ulas c coskun's Avatar

    Default Noise in front of 3.8L engine with 130K mi

    On Feb 6, 7:42.am, M100C <clbe...@..........> wrote:
    > All,
    > We've got a 2005 Dodge Grand Caravan with the 3.8 L engine and 130K
    > miles. .When the engine is at normal operating temperature and idling
    > under a load (the transmission in D and holding van with brake), there
    > is an intermittent knock/clatter from the front of the engine (sound
    > like spark knock). .Here what I know:
    >
    > 1) it is not a collapsed lifter; the noise is too low, not as sharp as
    > the ticking of a lifter and is irregular;
    > 2) it seems to be tied to engine speed. .While the noise is irregular,
    > the frequency increases with RPM;
    > 3) when the transmission is disengaged (shifted to P), the noise is
    > significantly reduced.
    >
    > Sounds like it is coming from the timing chain / water pump area. .I
    > am a pretty fair mechanic, but before I tear into this, I'd like to
    > know where the engine is predisposed to certain issues other mechanics
    > may have seen, with these symptoms and miles. .What are your thoughts?
    >
    > Thanks in advance,
    > Chris


    it might be a bearing on one of the pulleys. I donot know why it makes
    when it when you are on load,

    Also it might be something loose that vibrates when it is on load. the
    sound travels and resonantes at a random place.

    If it does not go bad, keep using as is. Othervise you are shooting in
    dark and it might be very ugly.

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