water pump groov pin

The original pin was a solid steel rod, tapered with a groove down one side. Being tapered it needs to be driven from the small end. If you can figure out which one it is.

If you can't drive the pin out, I have cut the pin off either with a chisel or a die grinder down to a bit below flush with the shaft so it won't cut out the threads inside the impeller when it screws off the shaft.

The impeller has left hand threads. I have used a propane torch (a soldering torch, not a oxy-propane cutting torch because an oxy-propaine torch could melt the impeller) to heat the impeller to free it from the shaft.

I just used a roll pin to replace it from the hardware store with a saftey wire through it and so far they have worked fine, but they won't last as long as the original solid pin.