Re: How's this

Posted by Wade on February 12, 1998 at 18:54:18

In Reply to: How's this
posted by Bob Carabbio on February 11, 1998 at 22:35:04

: You've been running hard water in the thing, and it wore the tips off - or maybe there's a crack in the head, and one of the 36 horses got out and kick'd 'em off.

: All seriousness aside, though, I've seen severalimpellers damaged that way,and my theory is that the boss in the head that controls the end thrust wears, and lets the pump shaft and impeller move back into contact with the tapered bore in the head which is smaller in diameter than the impeller.

: The head that came with my '31 is worn almost 1/4" farther back than standard. there's only 1/16" to 3/32"clearance between the impeller and the tapered bore.I'm using a head that's a '41 vintage replacement unit with the inner boss only worn about 1/16".The end thrust should be about 0.010".

: If your end thrust is O.K. the pump might have been damaged in an earlier combination.I've always found that the biggest maintenance problem with an "A" is generally the former owner.

: Bob Carabbio

Bob:
I think you hit on something, when the pump went out I had two pumps ready, and they both had washers(look like neoprene}between the tear drop washer and the water pump bearing gear. I assumed the one I took out was the same but if the feltwashers were on the shaft behind the fan and disintgraded this would allow the shaft to go back into the motor block this makes sense as the the empeller damage.I will pull the water pump next week and do some measurements if I come up with anythingI will let you know. Still open for comments.Thanks, Wade




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