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1993 Buick park avenue 3.8l v6

Issue just started - out of rhythm knocking or banging from best area.

This is a video I took of it yesterday:

http://www.youtube.com/watch?v=zhlQ9pQZ ... e=youtu.be

Any thoughts or ideas would be appreciated. Thanks in advance.


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contributions: 1961
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Location: Oregon
check and make sure the crank bolt in the center of the harmonic balancer isn't loose. Is the belt pulley part of the balancer or is it bolted on?


   
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Kind of hard to tell with that video, but it sounds like either a bad spot on the belt, the tensioner is popping, or yes, the harmonic balancer is bad. Check the whole belt to make sure there is not a small part hanging off.

When the balancer fails, the rubber inside that separates the outer belt pulley from the balancer is broke or worn out the 2 pieces clunk and pop together.


   
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