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A bad belt can make a noise astonishing like a bad rod -- it will go away when the belt is changed or the glazes section sanded.
However, a clank near the front of the engine can be a bad bearing, at worst actually spinning in the block. This would be bad news -- is it worse on acceleration or the same all the time? Same all the time would be more likely to be a bad balancer or pulley....
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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