Oil pump problems

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Engine noise

Chevrolet Silverado 2011  90000 miles
My car started making a strange noise, as if it were a template's bearing or damaged band, but we've removed this last one and nothing changed. We've also opened the car's distributor and replaced the oil pump which was softly damaged, but again nothing changed. We've checked it with a stethoscope and the noise seems to be coming from the bottom. There was no overheating nor an oil failure, any help to give me?
adolphus from United States 9 years ago  
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Delores from United States 9 years ago
The noise might be coming from a piston rod's piece of metal.
adolphus from United States 9 years ago
Thanks for your comment, Delores. I tell you that we've finally solved the problem when we took the engine out and found three damaged propellers. We've then changed them and luckily the car is now working properly.
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