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1921 Emerson Jr. tapered bearing repair  Rate Topic 
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 Posted: Wed Jan 9th, 2019 11:40 pm
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Joe DeVoe
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I have a 1921 Emerson Jr on my bench and upon getting all things back to assembly condition I find the bearing is probably in need of some repair, resurfacing, or ???  Upon starting it up, is runs fine for about 2-3 minutes.  Then it develops a knock kind of like a piston rod with a bad bearing.  So, is there a way to have this type of bearing and rotor resurfaced in some way.  I'm sure the fan has run out of taper and there is only a 1/32 fiber washer on the back end so something thinner is not an option to use more taper.  The surface of the rotor part on the back end looks very coarse but the shaft on the case housing seems okay or smooth.  Hope this explains well enough and any input as always is appreciated.  
Joe

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 Posted: Sun Jan 13th, 2019 08:32 pm
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Joe DeVoe
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Conversed with Darryl H. and I guess what I need is a new rotor or one worn less than mine.  So if anyone knows of a 1920's Jr. Emerson let me know.  

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 Posted: Sun Jan 13th, 2019 10:16 pm
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Lucas Beshara
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I agree with Darryl. Sleeving the rotor has worked sometimes and sometimes not. If the single hardened bearing is gone it’s gone. Look for a doner

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 Posted: Sun Jan 13th, 2019 11:04 pm
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Joe DeVoe
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Hello Lucas.  I'm guessing from what Darryl said and I agree that the rotor is probably the problem based on how it looks, which is rough and worn.  Also guessing that the hardened shat on the case is maybe okay.  Only way to tell is find a "new" donor rotor.  

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 Posted: Sun Jan 13th, 2019 11:22 pm
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Chris A. Campbell
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Joe,

I had either the same issue or similar issue as you.

Mine turned out to be the stator.

Would start fine and after a few minutes a light knock and then another gradually the knocking became louder and time in between knocks more frequent.

Started out as you are. Swapped parts between 3 different 9” non oscillator Jrs. Rotors, washers, housings with pressed in shafts... tried it all.

No idea how or why but after placing the stator into a 4th Jr affirmed was stator.

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 Posted: Mon Jan 14th, 2019 12:01 am
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Joe DeVoe
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Wow.  That is news Chris.  Can you tell me how the stator would be able to make that noise?  I had thought about that too but couldn't come to any logical way this non-moving part could cause the knock.  
Joe

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 Posted: Mon Jan 14th, 2019 01:16 am
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Chris A. Campbell
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Joe DeVoe wrote: Wow.  That is news Chris.  Can you tell me how the stator would be able to make that noise?  I had thought about that too but couldn't come to any logical way this non-moving part could cause the knock.  
Joe


I wish I knew why but have no idea. All I can think of and this is purely a wild guess is that my leads that tap into stator had a break. Maybe a wire was turned in opposite direction from a coil. It really makes no sense to me.

That head wire went in deep. Otherwise just varnish.

Swapping that stator was the solution though. 

That is only time I have encountered the knocking. Originally thought rotor or shaft may have had oval wear pattern due to the slow increase in knocking. Tried it all. Finally after crossing parts the only common attribute was that stator.

Would like to know why too and if any electrical experts have thoughts like to hear them.


Last edited on Mon Jan 14th, 2019 02:22 am by Chris A. Campbell

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 Posted: Mon Jan 14th, 2019 03:34 pm
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Michael Rathberger
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Joe DeVoe wrote: Wow.  That is news Chris.  Can you tell me how the stator would be able to make that noise?  I had thought about that too but couldn't come to any logical way this non-moving part could cause the knock.  
Joe


After reading Chris's post, you might try running it on a variac at a 10% reduced voltage, see if it still develops. Maybe the stator can't handle the line voltage?

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