Crank shaft bearings

[Patrick L.]

Originally Posted by Rich Bowes

As some of you have suggested, the correct answer is: "if it ain't broke, don't fix it", or "don't go looking for trouble unless it comes knocking". Do I have this about right?

It may be smooth and quiet with no load and not rear its ugly head until put under a load. Then it can be hard to hear but may be felt. Main bearing that is.
If it seems OK, it probably is. If for reason the pan ever comes off, then is a good time to check them.