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Q: i have a kinda knocking noise coming from the front of the motor on 1995 Buick LeSabre

i can't find out where it's coming from (not internal)i pulled the serpentine belt & it seemed to quite down a little when the rpm goes up it seems to quite down even more. any ideas?
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Crank pulley (harmonic balancer) broken! Engine off belt removed see if it can be turned fairly easy by hand back and forth it should NOT if it is ok!! This is a common problem on this vehicle. I know, it 'looks' like there is nothing wrong!!!
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