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Scraping alternator fan on housing
If I tighten the bolt that holds the alternator to what I feel is the proper torque the fan scrapes on the housing. If it's loose, it dosen't scrape. New fan belt was installed, got a little worse. Could it be my alternator bearings wearing out?
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1974 911 2.7L coupe with sunroof |
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02-07-2002, 10:12 AM
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Join Date: Dec 1999
Location: Ft. Collins, CO USA
Posts: 383
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Is your fan fully seated on the alternator shaft?
I replaced my fan a couple of years ago, and used a rubber mallet all around the fan where the alternator shaft sticks through, I just kept tapping until it was perfectly seated. With the tight clearance between the fan blades and housing, it doesn't have to be off very much to cause rubbing. My fan and alternator were out of the car at the time, making it easier to seat the fan. HTH Craig 77 911S |
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02-07-2002, 10:26 AM
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Too big to fail
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I had that problem once - turned out to be a cracked pulley!
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"You go to the track with the Porsche you have, not the Porsche you wish you had." '03 E46 M3 '57 356A Various VWs |
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02-07-2002, 11:41 AM
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Join Date: May 2000
Location: Los Alamos, NM, USA
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Yes, the bearing system can fail. This happened to me ('76 911S) but fortunately the brushes went first (so I got an alternator warning light) before the fan scraped. Besides the bearings, the plastic retainers holding the bearings into the alternator frame can fail (my case) - might be time for an alternator rebuild as this type of failure may also do in the alternator brushes (as in my case). Also check that all the fasteners securing the alternator to the fan shroud are intact and tight. Something is loose, missing or worn. Cheers, Jim
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02-07-2002, 12:54 PM
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Join Date: Nov 2000
Location: Baton Rouge, Louisiana
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Before you go crazy with bearings and torque settings, read this and check your shims. I had the same problem and the article fixed my problem of shim placement.
http://www.pelicanparts.com/techarticles/911_fan_belt/911_fan_belt.htm
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Mark Howard Baton Rouge, Louisiana 2023 Taycan GTS |
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02-07-2002, 12:59 PM
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Location: Baton Rouge, Louisiana
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Mark Howard Baton Rouge, Louisiana 2023 Taycan GTS |
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02-07-2002, 01:00 PM
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1974 Porsche 911 2.7L 
