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AFCA Forums > Antique Fan Collectors Association > Pre-1950 (Antique) > GE AOU rear bearing - oil or grease?

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 Posted: Sat Aug 1st, 2020 02:06 pm
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John Hausladen
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Good morning!  I searched the forums but did not find the answer to this.   I have an early Brass Bell AOU.  These have an oil port for the rear bearing and a groove in the bearing but no wick! Should this be lubed with oil or grease? The previous owner appears to have used grease for the rear bearing and it had pooled and dried up at the bottom of the rear motor cover. It's not desirable to have too much oil pooling in the gearbox either?  I'm stumped.   Thank you! 
Also to note, this fan did NOT have a fiber washer at the rear of the rotor. Seems to run fine without one. However the front of the rotor and the rear of the blade (aka both sides of the front bearing) have fiber washers. 

Thanks! 

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Last edited on Sat Aug 1st, 2020 02:07 pm by John Hausladen

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 Posted: Sat Aug 1st, 2020 02:08 pm
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John Hausladen
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 Posted: Sat Aug 1st, 2020 03:18 pm
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Richard Daugird
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You put grease in there, not oil.

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 Posted: Sat Aug 1st, 2020 03:57 pm
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John Hausladen
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Thanks, Richard! 

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 Posted: Sat Aug 1st, 2020 04:03 pm
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John Hausladen
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How about a rear fiber washer. Ever opened up a never-opened AOU?  Did it have one?  Thanks. 

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 Posted: Sat Aug 1st, 2020 09:48 pm
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Steve Sherwood
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Richard Daugird wrote: You put grease in there, not oil.No you oil the bearing, no grease. You add oil through that port above the bearing. You push down the little  ball port above the bearing and add oil. Use grease on the gears only.

Last edited on Sat Aug 1st, 2020 09:50 pm by Steve Sherwood

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 Posted: Sat Aug 1st, 2020 11:36 pm
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John Hausladen
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Kind of a funny system.  I can see why they added a wick in the later AoUs

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 Posted: Sun Aug 2nd, 2020 02:04 am
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Mark Olson
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It is a conundrum. The excess oil will leak into the gear box, hopefully before it slings all over the walls, furniture and draperies. In this case, modern lubes should be able to mix. In the old days, grease and oil were very different; soap based, fat based, and so on. Today, it is not so different, lubes have different bases. Perhaps the synthetics are more compatible with each other, but perhaps not. There is really no good answer.


Just put new grease on the gears and zoom spout or 20w non detergent in the oilers.



Edit: As far as fiber washers, they are used a needed to adjust the slack, or end play. If some are too many and one less is not enough, rub one on a file to reduce its thickness to set the end play. I set mine at .015" - .020" after determining where the rotor wants to live.



Last edited on Sun Aug 2nd, 2020 02:16 am by Mark Olson

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 Posted: Sun Aug 2nd, 2020 01:55 pm
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John Hausladen
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Thank you, Mark!  BTW, I am in New Orleans. 

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