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Registered
Join Date: Mar 2007
Location: asheville
Posts: 205
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Alternator re-install humming sound
I just took out my alternator to have the VR replaced and just now got it back in. When I started it up, I noticed a low pitched humming sound that wasn't there before. I doubt a new VR would cause that. Is it possible that the alternator might not be alligned properly? If so, how do I check that?
Thanks its an 87 Targa
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Carl F 2000 Ruby Red Dodge Stratus with high performance racing stripe SE edition WTF? (sadly gone, but not forgotten) 1997 HOnda Accord "Shaggin Wagon" 1987 All black Targa 1998 Lemond Zurich/Dura Ace 2005 Jamis Dakar Sport 2006 Lemond Reno 2 DOgs , 2 Cats, Shi@ton of fleas 1 Cool as Hell Wife that tolerates my stupidity |
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08-09-2007, 02:22 PM
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Join Date: Feb 2006
Location: Oahu
Posts: 2,303
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I take it you spun the fan by hand, prior to installing the belt? I've had them (alternator) not seat correctly. If your blades were coming in contact with the housing, it would make a different noise than a hum, I believe. I've also seen powder coating that decreased the fan-tip to housing tolerance as well.
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Jon |
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08-09-2007, 03:20 PM
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Join Date: Apr 2005
Location: Derry, New Hampshire
Posts: 618
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You might need to adjust the shims on the belt to tighten it up a bit more? I don't believe it matters what orientation the alternator is in as long as the bolts go through the fan housing and the cooling duct and everthing lines up that way.
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- Tyler 1988 911 Carrera Grand Prix White/Black 2015 Cayenne Diesel Black/ Luxor Beige/Black |
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08-10-2007, 05:07 AM
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Join Date: Dec 2004
Location: South Florida
Posts: 102
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I just replaced my alternator (bad bearings) last week and had the same humming but at highter rpm. Assumed it was the new belt and it went away within a few days. It didn't sound expensive but just strange. All is well now!
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1981 911 SC 7 & 9 Fuchs, monoballs, 22/27 t-bars, 19/22 swaybars, M&K dual in/ dual out |
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08-10-2007, 05:30 AM
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