New Impeller is too Tight?

[digerata]

Hi All,

I'm in the process of replacing wear rings, carbon rings, SS rings, impellers on my speedster...

On the first pump I tackled, when I screwed the new impeller in, it gets so tight that it is difficult to turn by hand. I thought this might be something to be concerned about.

The impeller is not leaving marks on the wear ring when I turn it and I can't really see it ever touch the wear ring so I doubt it is binding on that.

Is this normal?

-Mike

 

[ocod]

Probably squished thrust washer.
Did you over tighten it?

 

[digerata]

Thanks for the reply.

That was just about 10 ft lbs of torque.

The one washer that was loose at the back of the pump is in there. The crazy thing is that I put back on the old impeller and it exhibits the same behavior.

Grrr...

 

[RFoster130]

Is it a new wear ring too? If so, it will make enough room when it spins a few times. Thats normal.

 

[digerata]

You are right. I think what happened is I had put them in the freezer so they would go in easier. They weren't cool to the touch but they must still have been a bit smaller in diameter. A couple hours later the problem was gone and everything fit perfectly.

Yay! Sorry the frantic, insane posts!