Why is my Audi 80's engine producing a strange knocking sound?

I've noticed that my Audi 80's engine has started making a strange knocking sound while running. It seems to be coming from the engine block and I'm worried it could be a serious issue. Can anyone offer any insight into what could be causing this and how to fix it?

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Why is my Audi 80's engine producing a strange knocking sound?

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