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Registered
Join Date: May 2004
Location: DC/NC
Posts: 812
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Alternator light flashing, hear noise
Hi folks,
Today while sitting in traffic I noticed that the alternator light was flashing at idle. When I got to work, and poped the "hood" I heard a slight whinning noise coming from the alternator. Also, the alternator belt pulley is not rotating evenly, kind of bobing up and down. I'm going to pull the thing aparts as soon as I get home tonight, just curious what could cause the pulley to rotate in that manner. 
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911 |
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10-14-2004, 01:08 PM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,493
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bearing on the alternator shaft going bad.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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10-14-2004, 01:09 PM
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That noise got really loud and scarry on mine right before it went "kaput" in the middle of an intersection....which led to a gas station attendant and me pushing it to his lot!
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Adam, 2019 BMW 540i |
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10-14-2004, 01:16 PM
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Join Date: May 2004
Location: DC/NC
Posts: 812
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noise is not constant, a slight whine...but I can definately see the pulley bobing up and down while spinning....
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911 |
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10-14-2004, 01:17 PM
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Join Date: Mar 2002
Posts: 3,563
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Sounds like the bearings are on the way out. Do some preventative maintenance and get it fixed/replaced before it leaves you stranded
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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10-14-2004, 04:17 PM
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Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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"Sounds like the bearings are on the way out. Do some preventative maintenance and get it fixed/replaced before it leaves you stranded."
and before it ruins the fan which is not cheap. If the fan starts banging do not keep driving and do not take off the belt and then drive. If this happens order up a "flatbed tow." Driving without cooling air will very quickly overheat and ruin the engine. |
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10-14-2004, 04:26 PM
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Registered
Join Date: May 2004
Location: DC/NC
Posts: 812
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Thanks guys...I've already parked it until a new alternator arrives. No worries.
 As you can see from my sig. line there are plenty of other candidates to take for a drive....
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911 |
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10-14-2004, 05:10 PM
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1980 Porsche 911 SC Targa 3.0L
