Re: Clacking sound.
Since we are stabbing in the dark here, how about loose engine pans? I had a horrible loud squealing that sounded like the driest of dry bearings burning itself to pieces. Turned out to be a loose bolt on an engine pan setting up a "harmonic" vibration. Of course yours is a "clack" but might be worth checking as other guys have told me they have had loose engine pans make all kinds of oddball noises.
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