[rotorwrench]

When the dippers hit that puddle of oil in the dipper tray, there is pressure to the oil that injects in there with each revolution. There is no way to measure it but it does get a good squirt each time. The higher the rpm, the higher the pressure. The X shaped grooves spread a more even flow of oil over the whole journal than a single groove can.

If the rod bearings still have a usable clearance, a person would need to check the center main journal. They take a beating compared to the others and they will knock if the clearance is too much.

A person would have to get all the oil off of an area that they want to try to solder. Even with flux, it's hard to get it to tin so the stuff would stick.