How's this

Posted by Bob Carabbio on February 11, 1998 at 22:35:04

In Reply to: Waterpump mystery:
posted by Wade on February 11, 1998 at 19:41:11

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

Follow Ups:
Re: How's this Wade February 12, 1998 at 18:54:18(0)
Re. Water pump Wade February 12, 1998 at 12:41:26(5)
Re: Re. Water pump Jerome Bokelmann February 13, 1998 at 12:18:55(0)
fresh busted tips Bob Carabbio February 12, 1998 at 14:18:50(3)
The way it should be- Bob Carabbio February 12, 1998 at 20:25:16(2)
Re: The way it should be- But? DJ.Voyce February 13, 1998 at 02:05:43(1)
Re: The way it should be- But? Bob Carabbio February 13, 1998 at 14:43:25(0)

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