Not common. Can you tell where the the sound is coming from?

At the auto parts store, you might find a stethescope looking device with a metal rod in place of the flat metal part in the Doctors office. You touch the rod to surfaces you want to listen to, like the water pump, heads, lower block for instance. It can narrow down the search and give you clues as to the true location the sound is coming from, well worth the small cost.