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  1. HoveringHMMWV

    6.2 Motor Chirp - may be pulley bearing or vibration squeak

    This would be the maintenance procedure from the reference that I have handy. TM 9-2320-280-34 3 - 6 Crankshaft Pulley Replacement and 3 - 7 Torsional Damper Replacement -HoveringHMMWV
  2. HoveringHMMWV

    6.2 Motor Chirp - may be pulley bearing or vibration squeak

    I had the same "chirp" sound emanating from the engine at idle (once every belt rotation). I deduced that a bearing, having more rpm's, would've produced more "chirps" per minute and therefore the belt might be the problem. Changed out the serpentine belt and the "chirp" went away. My belt...
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