I'm afraid these tests wouldn't reveal an imminent failure in a rod bearing. If the mains were significantly worn you might get an early indication with lower oil pressure (assuming you knew what it was accurately before), but no way of checking a rod bearing except for looking at it, in my experience. By the time it's knocking it's well down the path to trouble. And if we're talking about concerns over whether or not a bearing is about to spin, I don't know any way of assessing this before the event. I guess you might get a clue from inspection of the bearing fit surface and the locating tang, if things are getting really bad... but they tend to just go suddenly. And in an engine like this, if I have removed the bearings for inspection, there's no way I'm putting the old ones back.
Roger
Roger
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