I have several PS3 engines in four and six axle, plus two steam. On occasion, one that's new out of the box will "squeal". If that happens, cut the power and let it sit with the power on for a few minutes. I don't know why they do it, but that has only happened for me with a couple of brand new engines.
Other than that, all of mine have been fine. My Genset is a PS2.
What is yours doing?