I have as bell type rattle that I can't seem to narrow down. Sounds like a pulley being hit with a wrench intermittently during low rpm idle, all belts seem tight and pulley snug. Any thoughts?
I've never heard it myself, but I've seen some odd terms to describe the sound of a failing DMF. Something to the effect of a midget inside the bell housing with a hammer... A mechanics stethoscope (or a long screwdriver against your ear) might help locate it.
A long time ago (on an '81 Dasher diesel) I had a transaxle-mounted exhaust bracket suffer a fatigue fracture. Since the rest of the exhaust stayed in place in spite of it the two halves of the bracket would hit each other at idle and make a ringing noise.
Very unlikely in your case, but easy to check for.
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