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R & M 3804 oil seapage  Rate Topic 
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 Posted: Sat Aug 17th, 2019 03:26 pm
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Stephen Rybski
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Hello everybody, my R & M 3804 fan seems to be siphoning oil out of the front bearing past the rotor shaft leaving fine streaks of oil on front of the fan blades and spots of oil on motor housing and base after an hour or so of running. There is about .010 to .013" groove on shaft from oiling wick, I'm thinking the negative pressure behind blades is causing this issue and would using J-B weld for repair be an acceptable repair. Any input would be appreciated, thanks.

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 Posted: Sat Aug 17th, 2019 06:13 pm
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Steve Stephens
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Check to see if the tiny drain hole below the front bearing is not clogged with gunk.  It should be able to flow back into the oil cup from above the oil cup.

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 Posted: Sat Aug 17th, 2019 07:03 pm
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Stephen Rybski
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The entire fan was dismantled for paint and all drain holes were cleaned, all mating surfaces are clean and straight also.

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 Posted: Sat Aug 17th, 2019 07:19 pm
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Steve Stephens
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You might check with Rob Duffy who had a similar experience with his GE pancake.    I forget what the fix was.

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 Posted: Sat Aug 17th, 2019 09:41 pm
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Lane Shirey
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Re check the drain holes and if the blade doesn’t have oil slinger grooves on the hub, then you need a fiber washer between the hub and front of the front bearing.  If everything is as it should be, the oil should drain properly and no slinging. 

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 Posted: Sun Aug 18th, 2019 10:09 pm
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Stephen Rybski
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Thank you Steve

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 Posted: Sun Aug 18th, 2019 10:12 pm
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Stephen Rybski
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Thank you Lane, there is no fiber washer on fan base, just need to find out the size.

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 Posted: Tue Aug 20th, 2019 06:21 pm
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Lane Shirey
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The fiber washer is installed on the rotor shaft just before installing the blade. Some blades have a built in slinger but not sure from memory if that one does or not. Do you have a pic of the blade hub?

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 Posted: Wed Aug 21st, 2019 10:36 am
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Stephen Rybski
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I'll be back home in about a week, I'll take a picture of the blade hub and show it to you. Thank you Lane.

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