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Q:

motor has a knock i pulled the oil pan off and got appox 1/2 cup of metal on 1997 Toyota Avalon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
but the weird part is it runs and drives perfect but the knock sound is gettin louder and louder
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either your engine is going to blow out or seize up entirely if you do not it fix soon. something is grinding in there. possible your going to need complete rebuild or replacement. bring it to a shop so mechanic can get a hands on look at it. dangerous not just to you but to other drivers.
sounds like you have a spun bearing,if you have the oil pan off remove rod bearing caps to see if bearing is spun