So I'm freshening up my AT-309 pump after many summers of fun.  The shaft has some wear where it rides on the bowl bearings, as I would expect.  However, it's not nearly as bad as I expected after 550 hours of use.  I believe that most of the wear occurred early-on in the pump's life, when I used to run the boat on the Mississippi and Missouri rivers (lots of sand).  These bearings are water-lubricated bearing.

Since I'm the definitive tight-wad, I hate buying new stuff if there's not much wrong with the old stuff.  This shaft is a case-in-point: At the location where the wear is most severe, the shaft mics at 2.118. Virgin shaft measures 2.123.  So that's only 0.005" on the diameter (0.0025" radial/surface wear).  What I'd like to do is find some 0.010" undersize DU bowl bearings, and grind and polish the shaft appropriately.  I looked into this years ago with no joy.

Does anyone out there know of a source for undersized DU bearings?  If not, I'm going to contact GGB as to the cost of a "short" production run of undersized bearings. If it sounds remotely feasible, I'd offer them for sale to "whomever", since I don't envision ever needing 1000 (or 10,000) undersized bowl bearings.  The next question for all you guys that rebuild your pumps is what (under)size?  0.010"? 0.020"?  How many of you guys have marginally worn shafts laying around that could otherwise be put to good use?

Thanks in advance for your replies.

Matt

Crap, double post

I've looked at the sleeve kits, but have some reservations.  Anyone ever used one of these?

I've looked at the sleeve kits, but have some reservations.  Anyone ever used one of these?

yes on farm equipment that takes way more punishment than that shaft anyday, they work great. 

I can mic it if you want. There is no wear or scratches.