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Old 12-03-2019, 11:41 AM   #1
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Bathroom Fan Motor


Hey all!

I have an old bathroom fan - it had stopped running but I could hear the motor trying, so I thought to myself "Self, it's probably just all gummed up"

Being that I'm a self-proclaimed tinker-er, i took it out and tested my theory... Low and behold with a little push, the fan would start turning. I took it all apart, cleaned it all out, and coated it with a silicone lubricant.

Now, the fan is running beautifully except one concern: the motor runs quite hot. I can touch it and leave my finger there for a second or two.... So not like REALLY hot. There's no smoke.... And also, the surrounding enclosure / mounting points aren't warming up at all. It's been running about 10-15 minutes as I write this.

I'm fairly confident this is normal in a magnetic-drive fan...they typically generate a lot of friction. But I don't want to burn my house down, ya know? So, I'm hoping someone out there is no electrician and can tell me it's ok to re-install?

Thanks and happy fixing!

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Old 12-03-2019, 11:51 AM   #2
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Re: Bathroom Fan Motor


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Originally Posted by ciana.godin View Post
I can touch it and leave my finger there for a second or two.... So not like REALLY hot.
Two seconds means it's not considered overly hot. One second is too hot.

If you were running it out of its housing, it wouldn't be getting the normal air flow it was designed to get.

ps. It can be a futile task getting those sleeved bearing motors resurrected once they have been run dry. It may need periodic attention.
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Old 12-03-2019, 12:27 PM   #3
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Re: Bathroom Fan Motor


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Originally Posted by surferdude2 View Post
Two seconds means it's not considered overly hot. One second is too hot.

If you were running it out of its housing, it wouldn't be getting the normal air flow it was designed to get.
The housing thing makes sense to me - the air flow is different when it's not in the normal system. I'm going to run it a second time for 20 minutes and take a stopwatch and my finger for a ride just to be sure

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Old 12-03-2019, 04:41 PM   #4
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Re: Bathroom Fan Motor


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Originally Posted by ciana.godin View Post
Hey all!

I have an old bathroom fan - it had stopped running but I could hear the motor trying, so I thought to myself "Self, it's probably just all gummed up"

Sent from my moto z4 using Tapatalk
So why bother with this thing if as you say is "OLD". It's probably running too slow for the required CFM of the room. It's running hot as you say, & you can bet that it will soon start stalling again on start up. You can buy a modern unit, that will do the job. Yes it may take some extra work fitting it into the space of the current one, but well worth it. Just my own .02 $100 buck replacement is a lot cheaper than a $100,00 fire.
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Old 12-03-2019, 07:05 PM   #5
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Re: Bathroom Fan Motor


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So why bother with this thing if as you say is "OLD"....

..... You can buy a modern unit, that will do the job. Yes it may take some extra work fitting it into the space of the current one, but well worth it. Just my own .02 $100 buck replacement is a lot cheaper than a $100,00 fire.
Well, I just don't believe in throwing things away without making an effort. For instance: my 2002 wrangler that I can't stop working on.

BUT all in all, I was uncomfortable with the heat after trying it again, and ended up spending 16 bucks to replace the motor. I now call it franken-fan. And feel safe. So there's that.

Thanks for the $0.02

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Old 12-03-2019, 09:50 PM   #6
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Re: Bathroom Fan Motor


I had two of those little babies in my CA home... I kept them going for 36 years with a little 3-in-1 oil ever few years. AFAIK, they're still going. Like you, I hate to pitch things. If it becomes truly necessary, even then I'll gut it to see why it failed or how it works, just the way I roll.

"Good Judgment Depends Mostly on Experience and Experience Usually Comes from Poor Judgment." I don't know who coined that phrase, but I like it since most of my actual education came from experience. I still have all my body parts but at times it was a wonder.

My 2

Best wishes, SD2
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