| doning | -- 08-17-2011 @ 4:33 PM |
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I recently bought and installed a new 3 brush generator for my '37 Ford from a popular early V8 restortation company. After about 5 miles on the new generator it is making a steady cuh, cuh, cuh sound coming from the rear where the brushes are. Is this a normal sound from a new generator? It almost sounds like the brushes being cut into the armature. Thanks.
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| ford38v8 | -- 08-17-2011 @ 5:08 PM |
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doning, no, there should be no sound at all. YOu may pull the inspection cover to examine the brushes in action to determine if this is the problem. The noise may also be from a lack of lubrication. There is an oil cup at the rear, a trap door with a felt inside. Before I had my generator rebuilt, I had to oil this point almost every day. Alan
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| supereal | -- 08-18-2011 @ 12:13 PM |
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Remove the band and check to see that the brushes and springs are in the proper place, and that the brushes are free to move. I assume that the generator is a "rebuilt", and not a new one, as I haven't seen one of those for a very long time. It could be a rough rear bushing or an armature that was cut off center. Most vendors don't do the work themselves, and rely on a third party. As you say it was recently purchased, I'd box it up and return it for refund or replacement.
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| 37RAGTOPMAN | -- 08-18-2011 @ 3:27 PM |
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SUPER is right, you paid good money,for a defective unit,you deserve to receive a quality rebuild, just make sure it is defective, I think the place were you bought the unit should make good for it,they also should pay the shipping for sending back and another unit to you, call them up, and explain you are no happy with the unit sent to you, would be really nice to know, were you bought it so other members would were not to go ,,,, my 3 cents 37RAGTOPMAN Try CERTIFIED AUTO ELECTRIC, they advertise in the V8 TIMES, and are nice to deal with,
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| doning | -- 08-18-2011 @ 4:33 PM |
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I found out what is making the noise. It is the brushes. The spring tension on the brushes are very strong. I lifted the brushes up on my old original generator and they are much weaker. Is this anything to worry about now?
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| supereal | -- 08-18-2011 @ 8:29 PM |
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The chances are it will quiet down after running awhile. If the brushes are not fitted to the armature, the rough edges of the commutator segments will be noisy until the brushes wear. Now that generators have virtually disappeared from cars, few technicians know how to fit the brushes. Strong brushes are better than weak ones, and as the brushes wear, the springs will lessen tension. This message was edited by supereal on 8-18-11 @ 8:30 PM
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| 37RAGTOPMAN | -- 08-19-2011 @ 8:38 AM |
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If the brushes are arcing spark a great deal, it might be a problem,if they keep that up they will burn up the copper commutator also how many amps are they charging? check them in the dark. get back to us, my 3 cents 37RAGTOPMAN
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| supereal | -- 08-19-2011 @ 3:25 PM |
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I'd bet the noise lessens or disappears after a couple of hundred miles.
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| doning | -- 08-19-2011 @ 3:41 PM |
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The brushes are not throwing any sparks. Right now the generator is charging at 20 amps going down the road. Too much?
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| 37RAGTOPMAN | -- 08-19-2011 @ 5:51 PM |
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I would set it at 10 amps and see if that maintains a charge of the battery at that point, if you drive a lot at night, you might have to step it up, with the lights on it should just show a little movement of the needle to the charge side, my 3 cents worth 37RAGTOPMAN
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| doning | -- 08-19-2011 @ 6:31 PM |
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I do not plan on doing any night driving.
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| supereal | -- 08-19-2011 @ 6:56 PM |
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Don't set your charging with the dash ammeter. Use a separate voltmeter across the battery, and adjust the third brush for 7.5 volts at a fast idle.
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