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Re: sound on engine
If it's rymthmic and changes with engine rpm, could be a rod bearing.
Start it up and let it warm up. Raise the hood and listen around. Does it come from the top (valve cover)? Does it sound like it coming from lower down?
An old trick it to take a long screwdriver and put the tip on a spot on the motor. Then put your ear to the other end (the handle). You'll hear the engine noises transmitted up the screwdriver. Then move the screwdriver around to other spots and listen. When you hear the noise loudest, you're in the right area.
Or you can go to a autoparts store and get a mechanics stethoscope.
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