Engine noise

first thing to do is check oil level, and get an oil pressure test done, i would like to see the oil pressure readings at cold idle, hot idle and hot at 1500RPM oil pressure test is fairly simple you do need a mechanical oil pressure gauge that will screw into the oil pressure sender port. A cooling system pressure test will help locate any external coolant leaks.

Here is a guide that will help you check for leaks.

https://www.2carpros.com/articles/car-is-leaking-coolant

This guide may help as well

https://www.2carpros.com/articles/engine-noises

Please let us know what happens.

Cheers, Ken