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Q:

loud rattle from engine.thought it was bad water pump. on 1993 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I removed the belt and still have noise.sounds loudest from rear valve cover with stethescope.
(1) Answer
you need a shop to track it down. it may be internal and require dis assembly of the motor to find the failure.

Roy