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Cooling Fan Motor

 
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  #1 (permalink)  
Old 22 Sep 2009, 05:58 pm
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Default Cooling Fan Motor

I lost the high speed portion of my radiator cooling fan. All that is wrong with it is the brushes. I sent it off to get new brushes and wondered how many others of you might have a fan motor lying around with the same problem. I need another one to rework if this one turns out to work well and if it is not too high $$ to do so, I'll fix it for next to nothing as a trial.

If this works, might be able to save us all a lot of money when these things stop for previously mysterious reasons.

So, anyone else have one around you'd like to let me swap the brushes in, assuming, they get me the right ones in the next week or so?

Thank you,
Tom
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Old 22 Sep 2009, 08:22 pm
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Default Re: Cooling Fan Motor

Let me know how well that works. I do a fair amount of them and a cheaper alternative would be nice. Especially if it lasts.
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Old 22 Sep 2009, 08:31 pm
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Default Re: Cooling Fan Motor

Could also be a break or short in the windings...
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Old 22 Sep 2009, 08:35 pm
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Default Re: Cooling Fan Motor

Slarty, the motor is a very strong one and apart, it virtually has no wear, the bearing is smooth as glass, and the bushing is tight and good. All that is wrong is the high speed brush pair is worn down to nothing. I preloaded the short brushes, slapped it back together and away it went.

Why they used brushes that wore so fast is beyond me. Obviously the high speed ones will go away sooner since the motor runs faster.

I think if they can be fixed for minimal dollars; it is well worth repairing a few and trying them!!
Tom
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File Type: jpg High speed brush with ruler pt.JPG (43.0 KB, 37 views)
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Old 22 Sep 2009, 08:38 pm
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Default Re: Cooling Fan Motor

QS Don, I worried about that too but once you see the brushes just sitting there, not even touching the commutator, it all makes sense as to why it works now and then but not all the time once it starts to go bad.
Tom

Last edited by VOETOM; 22 Sep 2009 at 08:42 pm.
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Old 22 Sep 2009, 08:40 pm
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Default Re: Cooling Fan Motor

Quote:
Originally Posted by VOETOM View Post
QS Don, I worried about that too but once you see the brushes just sitting there, not even touching the commutator, it all makes sense as to why it works now and then but not all the time once it starts to go bad.
Tom
Okay - you may be right for yours... I was just commenting on what else could cause a motor to fail.
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Old 22 Sep 2009, 08:43 pm
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Default Re: Cooling Fan Motor

I agree with you Don, and I wonder how many truly are internally bad or are just worn like this one was? Ours had only 68,000 miles.
Tom
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File Type: jpg Brushes.JPG (38.7 KB, 30 views)

Last edited by VOETOM; 22 Sep 2009 at 08:46 pm.
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Old 04 Oct 2009, 04:43 pm
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Default Re: Cooling Fan Motor

I have 12 new brushes coming and will rework mine and see what happens!
Tom
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Old 04 Oct 2009, 08:51 pm
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Default Re: Cooling Fan Motor

Just remember that the harder the brush the faster the commutator wears,I'd suggest changing the brush springs at the same time and giving the commutator a little clean up...Yep, they are a well built motor except for the brush choice.
National Carbon made brushes to my spec but we ordered hundreds of them for industrial motors,I have no idea of what their min. order is.
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Old 04 Oct 2009, 11:51 pm
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Default Re: Cooling Fan Motor

MY GT has a very loud cooling fan humming noise what is the cause?
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