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Registered
Join Date: Jun 2006
Location: Alberta Canada
Posts: 132
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Noise from alternator/fan area
Have recently noticed a different noise coming from the fan/alternator area of car. Adjusted belt and it helped for awhile however noise has returned. Alt seems to rotate free of grinding when belt unhooked however I am unsure how "freely" it should turn if bearings are good. Any easy way to see if alternator bearings are going as opposed to bad fan belt or belt that requires further adjustment?
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1986 911 Factory Turbo Look Targa 3.2 litre |
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01-15-2008, 06:35 PM
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Make My Day
Join Date: May 2003
Location: Northern NY
Posts: 1,305
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A description of the noise would be helpful.
Bad bearings won't necessarily make a grinding noise while free spinning.
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74 911S Targa ROW Building Designer/Business Owner |
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01-15-2008, 08:17 PM
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Registered
Join Date: Mar 2000
Location: Acworth, GA
Posts: 502
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Is the fan scraping the housing? Disconnect belt and check for any freeplay of the fan- kinda like you check the front wheels for worn bearings.
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Ray '88 Carrera, '81 SC, BMW R1200C, BMW R75/5, Ducati S2R Monster, '70 Karmann Ghia |
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01-16-2008, 06:29 AM
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Registered
Join Date: Jun 2006
Location: Alberta Canada
Posts: 132
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Thanks for the response guys. I will check for clearance with fan and provide a better description of noise when I return home this evening.
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1986 911 Factory Turbo Look Targa 3.2 litre |
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01-16-2008, 07:32 AM
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Forced Induction Junkie
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Sometimes when belts age and dry out, you will hear a grinding noise. Try a new belt first before attempting the alternator R&R.
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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01-16-2008, 10:35 AM
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Registered
Join Date: Oct 2004
Posts: 15,612
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I think it could be worn alternator bushings. If there is no grinding noise, then you can keep it going with a better fitting fan belt. I'd look for the Continental belt, or the Porsche OEM belt. Gates and others don't seem to fit as well. The Porsche belt has to be ordered and shipped from Germany and can take a few weeks.
Another potential problem may be a worn pulley, which may cause fit issues with any brand of belt. |
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01-16-2008, 11:09 AM
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1985 Porsche 930 Fac. Slantnose 3.3l
