I took my impeller out of my water pump and part of it is missing. I'm trying to find it and can't remember what the inside of my oil cooler looks like. Will it fit through my oil cooler? If it fit through the oil cooler then it is in the motor. The piece that came off is about 1 inch by 1/2 inch. I am hoping it is stuck at the beginning of the oil cooler. Any tricks on how to flush it out? I got the oil cooler from Rex.