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P-Car
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Engine Whine
Hello!
Recently my 1978 SC 3.0 has been making a terrible whining noise. It isn't the typical whine heard when the throttle opens, it is apparant at idle. I'm suspecting perhaps the alternator. It sounds like I have a supercharger. I have good oil pressure and all, and the engine seems to run very well with no knocking sounds, power problems, or overheating. Would it be ok from dead cold to start the engine without the fan/alternator belt for just 5 seconds to see if the sound is absent? I know the 911 basically needs that fan or else the engine will literally die; however, if dead cold tomorrow morning (5C or less) can I run it without the belt for a few seconds or will that result in damage? thanks in advance. -Tom
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1978 911 SC Targa 1975 914 1.8 1980 Mercedes 300 SD |
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03-21-2013, 10:54 PM
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Maybe try and spin the alt/cooling fan with your hand or wrap a piece of cord around the pulley and pull it to try and duplicate the noise with the motor off first. Just a thought?
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78 911 SC "Scratchy" 2004 Mini Cooper S "Pele" (gone but not forgotten) 1979 classic mini clubman-"Coolio" |
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03-21-2013, 11:00 PM
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Member 911 Anonymous
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+1 remove belts one at a time to eliminate alternator/fan belt being to tight or vevn pulley rubbing against the fan housing. if you have ac, eliminate the compressor.
do not let it run for a long time battery will drain and worse she will over heat.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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03-21-2013, 11:24 PM
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P-Car
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Thanks guys!
No a/c and air pump was removed by PO, so just one belt. I will just run it for a few seconds without the belt then. I should mention I did change the belt back in November before a long trip to California and back. I originally did install it to tight at the fan blades were touching the fan housing, but then I loosened it a bit and all seemed well. Last edited by woywitka; 03-22-2013 at 10:22 AM.. |
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03-22-2013, 10:20 AM
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Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
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you should be able to start it and run at idle for quite a while . a few minutes for sure before the temp even begins to move .
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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03-22-2013, 03:45 PM
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Registered
Join Date: Jan 2006
Location: Santa Barbara, CA
Posts: 2,307
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Leave the wife at home?
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jhtaylor santa barbara 74 911 coupe. 2.7 motor by Schneider Auto Santa Barbara. Case blueprinted, shuffle-pinned, boat-tailed by Competition Engineering. Elgin mod-S cams. J&E 9.5's. PMO's. 73 Targa (gone but not forgotten) |
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03-22-2013, 04:36 PM
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P-Car
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Quote:
Thanks for the help guys. It is most certainly an issue with the alternator, car sounds great with the belt off, and when I spin the fan/alt by hand there is some crunching sounds. Time to send the alternator off for a rebuild. -Tom
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1978 911 SC Targa 1975 914 1.8 1980 Mercedes 300 SD |
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03-24-2013, 10:11 AM
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Member 911 Anonymous
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it might just need repacking of grease, just use a pin tool, remove plastic cover and pack some bearing grease in there. if it still whines, then send it off, check regulator while you at it.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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03-24-2013, 11:44 AM
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1978 Porsche 911 SC Targa
Coolio
Scratchy
Scratchy
Scratchy
Scratchy
Scratchy
Marble Grey
