Yes sir, it'll still work. Up until the shaft housing breaks completely off. Then it will loose all pressure. I'm not saying that's what it is, but I've seen it produce waning oil pressure over time until the housing broke completely. This is exactly why I like rebuilding pumps. Because not only is the original casting made better, but it is also "seasoned" to some extent having heated and cooled with the rest of the engine through many hundreds of cycles, so it actually has a lesser chance of cracking, IMO. To date, I have yet to see a housing worn on the inside. It's always the rotors that wear first and they come new in the rebuilding kit. I have seen more cracked and broken replacements than anything. The original Chrysler castings are pretty good.
