Carbon build-up... - Saab 900 Bulletin Board - Saabnet.com
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Carbon build-up...
Posted by Whirligigmike [Email] (more from Whirligigmike) on Thu, 28 Oct 2010 21:24:26
In Reply to: Blowing Cooling Fan Fuse #25, reasons?, EverettDave [Profile/Gallery]
, Thu, 28 Oct 2010 01:08:37
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I had a similar problem.
I dismantled the fan and found that the brushes had worn enough to allow the graphite dust to "Bridge" the area between the brush holders and cause a short.
There are 4 brushes, set at 90 degrees to each other. So, they are fairly close together.
The brushes were not too short to re-use, they are quite "beefy"and gave up a lot of dust for fairly little wear.. A thorough cleaning and re-lube of the bearings restored the fan to service. Fan draws 8 amps now, four years since the fix.
If the fan is held on the motor shaft with a clip, dis-assembly will be a snap.
If held with a rusted nut, it might be impossible, even with an impact wrench.
Mike
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