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Mk3 Mondeo diesel 2001 onwards were built with defective crankshaft pulley which drives the large serpentine auxiliary drive belt. at idle speed it rotates slightly off centre which sets up oscillations in the drive belt causing major resonance. The loud drumming sound disappears when revs reach 1000rpm. Ford service bulletin issued to replace pulley with revised item and also replace belt and belt tensioner.

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Q: What are the possible causes of my mondeo diesel engine becomming noisy when ideling?
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