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OK, I found the culprit. The sealing surface on the impeller was damaged. aua The new seal was still good. I refaced the sealing surface on the impeller, reassembled and tested. Still leaked for about 1 minute. After that, No leak. It took a few seconds for the surfaces to mate up and seal off...

I am going to pull it off this weekend and tear it down to see what happened. I will let you know if i find anything.

The kit that I bought had a new shaft and bearing and new seal. I was careful with all parts and cleaned everything before assembly. I just don't understand the new seal leaking. Here is a picture of the kit that I used.

Thanks Westech, I thought that I could rebuild the pump as easily as anyone else. It couldn't be that hard.:oops: Well it wasn't hard to rebuild but it may be a problem to get the new seal surfaces to mate up. I will order one and maybe try to fix mine as a spare.

I just purchased and installed a kit for the M151 water pump. Assembly was easy and it looked good when finished. After putting it on and filling with antifreeze I fired it up only to find the new kit (seal) is leaking. I let it run at idle for about an hour and kept an eye on it to keep it from...