D2 water pump rebuild

Am in the process of replacing the seal in a late model D2 (5U- 18557). Purchased the replacement seal from Cat, (new part number 4N-7526). The sealing surface rides on what appears to be a ceramic washer that separates the seal from the impeller. This washer was loose when I disassembled it and there appears to be no way to center this washer. It isn't a close fit to the shaft. I'm thinking that perhaps it was bonded to the end of the impeller. Does anybody have some input on this? Don't want to put it all together find it still leaks and then have to drop the bellypan remove the # 44 hydraulic system and the radiator again.
Thx
D2Denny

Just did mine, d69u same bellows seal. Had the same problem, cleaned the back side of the washer, and mounting surface on the impeller with 100 grit sand paper,centered the washer and installed with jb weld. Put 10 lbs of weight on it to insure that the 2 surfaces would remain parallel after hardening. Polished the sealing surface with 600 grit paper on a flat piece of steel. This was the 3rd one I have done in the past few years, they dont leak. Blew out a final drive yesterday ,such is life in the world of old machinery!

Some of the aftermarket seals have a rubber seal that fits inside the ceramic seat and seals it around the shaft and cushions the backside of it where it is against the impeller. Hard to get the darned thing to slide down the shaft without pushing the seal out of the center of the seat. Lots of water soluble lube (KY jelly etc) helps a little bit.

The JB weld sounds good to me. The seat doesn't have to be perfectly centered if it's not worn. It does need to be flat against the face of the impeller though.

bobdawson and ccjersey thanks for the reply. Thats kinda what I thought. Always have some JB weld in the tool box for R&D purposes like this. I'll yuckey puckey them together tomorrow and proceed witht the installation.

Reguards

D2Denny