I'm convinced it's something attached to the engine - NOT in the engine.
Maybe the flex plate on the flywheel, the crank damper, the vacuum pump,
some belt driven accessory or a collapsed mount allowing something to
hit or flail about. NOT a bearing, rod, piston, valve, etc.
PLEASE be sure to tell us what it is if you ever find it!!
Marshall
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Marshall Booth (who doesn't respond to unsigned questions)
"der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '84 190D 2.2 229Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5
turbo 237kmi