The Stovebolt Site Forums The Shop Area Engine Shop Lost oil pressure, then coolant

The overheating can affect oil pressure, but I doubt that much. A rattle with low oil pressure usually means that there is a bearing gone. Once the bearing has lots of clearance, the oil pressure drops because it is pouring out of the bearing. I would say to you that the rebuilder will probably have a responsibility here. I would get some advice on how to approach it in order to get the best outcome.