Here is the most common reason for these Hartzell compact props to leak out the blade shanks. The rubber in the seals get hard from age. That is one of the many reasons these propellers have a calendar time limit. The hard rubber wears the Teflon strip that is bonded to the actual blade shank. That Teflon strip is the interface between the blade seal seal and the actual blade. Once there is a groove in the Teflon and the seals are hard, Guess what? It leaks.
I've bonded thousands of these to blade shanks over the years. I take great pride in how nice they look when I'm done. If there is an air bubble, in the epoxy, that bonds the Teflon to the shank, under where the seal rides. Then the prop will most likely leak in a couple hundred hours.
I've bonded thousands of these to blade shanks over the years. I take great pride in how nice they look when I'm done. If there is an air bubble, in the epoxy, that bonds the Teflon to the shank, under where the seal rides. Then the prop will most likely leak in a couple hundred hours.