alternator whine - Team Camaro Tech
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post #1 of 14 (permalink) Old Sep 11th, 05, 04:21 PM Thread Starter
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alternator whine

hey
is it normal for the powermaster 140 amp alternator to make a whining noise while driving or revving the engine?
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post #2 of 14 (permalink) Old Sep 11th, 05, 05:54 PM
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Re: alternator whine

make sure your belt is not to tight.

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post #3 of 14 (permalink) Old Sep 11th, 05, 05:57 PM Thread Starter
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Re: alternator whine

what is a good rule of thumb for proper tensioning?
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post #4 of 14 (permalink) Old Sep 11th, 05, 06:07 PM
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Re: alternator whine

1 inch of play at longest run.

you could have a bad bearing aswell


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post #5 of 14 (permalink) Old Sep 11th, 05, 07:38 PM Thread Starter
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Re: alternator whine

i dont think its the bearing
the altenator is only been on the car for one day and hardly driven
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post #6 of 14 (permalink) Old Sep 12th, 05, 04:49 PM
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Re: alternator whine

I have a powermaster alt and had to have it rebuilt within 3 days. I did not want to send it back, take to long, it cost me 30 bucks to rebuild.

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post #7 of 14 (permalink) Old Sep 12th, 05, 05:52 PM
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Re: alternator whine

just because its new doesnt mean its good?


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post #8 of 14 (permalink) Old Sep 12th, 05, 06:30 PM
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Re: alternator whine

"the altenator is only been on the car for one day and hardly driven"


If the battery was low, it's normal for some "whine" while charging.

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post #9 of 14 (permalink) Old Sep 12th, 05, 08:46 PM
 
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Re: alternator whine

Just because alternators are new most certainly doesnt mean they are good. In fact I wouldnt bet on it. I've been though many 'new' (yes, susposedly compleatly NEW) alternators that die within a few months; due to bearings; bad windings, etc...

Ford by far makes the best alternators; but I'm not bragging
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post #10 of 14 (permalink) Old Sep 17th, 05, 11:11 AM Thread Starter
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Re: alternator whine

is it normal for the brushes to make the noise?
the alternator otherwise is functioning perfectly
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post #11 of 14 (permalink) Old Sep 17th, 05, 11:22 AM
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Re: alternator whine

no if they are really loud then something is wrong.

they are graphite and wear in about 5 mins of run time.
but I NEVER heard of bad brushes in a long while.
chances are the bearing is what you hear but you refuse to concider it ?
bad or dry bearings make whining squeeling noise.
its the only part that it can be.
BUT its new so it cant be it?
if your so unsure take it to a shop to have them diagnose it.


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post #12 of 14 (permalink) Old Sep 17th, 05, 05:37 PM
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Re: alternator whine

Quote:
Originally Posted by stamatisg1977
is it normal for the brushes to make the noise?
the alternator otherwise is functioning perfectly
Unlike a DC motor, an alternator has two solid commutators for the brushes to ride against. So you won't get the brush whine you would out of a DC motor with a segmented commutator. I concur with the others - most likely bearings. Could also be a loose mounting bolt, too tight on the belt, or acoustical noise from high charging currents. In the later case, it should quiet down a few minutes after start when the battery recovers.

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post #13 of 14 (permalink) Old Sep 17th, 05, 05:42 PM
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Re: alternator whine

if you're worried, take it apart and see, only 4 screws to get it open.





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post #14 of 14 (permalink) Old Sep 17th, 05, 10:55 PM
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Re: alternator whine

Mist a little water on the belt while it is running and see if the noise changes. If it changes it's the belt.
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