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Stranger on the Internet
Join Date: Apr 2004
Location: Bradenton, FL
Posts: 3,244
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Alternator Orientation
Does the orientation of the alternator matter? The orientation of the guide vanes do, but does the alternator? Can the alternator be installed in more than one position in relation to the guide vanes?
I think I had my alternator in "upside down". It has been out for a bit, and I can't remember which way it is supposed to go in. 
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Patrick E. Keefe 78 SC |
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12-28-2016, 07:12 AM
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Location: Ontario Canada
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of course electrically it doesn't matter but getting the wires to reach might be a bit of a pain. I would do it right.
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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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12-28-2016, 07:40 AM
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Join Date: Oct 2008
Location: Nash County, NC.
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Look at your hub extension for the cutout for the VR.
On Carreras, they are either on top or bottom, usually top. Bruce |
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12-28-2016, 07:55 AM
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Stranger on the Internet
Join Date: Apr 2004
Location: Bradenton, FL
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I thought it over, and rotated the alternator 180 in the housing. That seems more logical.
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Patrick E. Keefe 78 SC |
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12-28-2016, 08:04 AM
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Location: Wayne, PA
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And don't forget that there is a locating "pin" on the bottom of the fan housing. If it is not aligned properly, the fan housing can crack when the securing band is tightened.
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Christopher Mahalick 1984 911 Targa, 1974 Lotus Europa TCS 2001 BMW 530i(5spd!), Ducati 900 SS/SP 2006 Kawasaki Ninja 250, 2015 Yamaha R3 1965 Suzuki k15 Hillbilly, 1975 Suzuki GT750 |
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12-28-2016, 08:04 AM
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Join Date: Apr 2004
Location: Santa Cruz Ca
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There should be a small "fairing" on the rear of the alt. It will only fit if the alt is correctly oriented.
regards, Phil |
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12-28-2016, 08:11 AM
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Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
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Alternator.
https://www.google.com/search?q=1978+porsche+alternator+housing&rlz=1T4GUEA_enUS570US570&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwityqfWsZfRAhVO3mMKHQNJDO4QsAQIPg&biw=1193&bih=794#imgrc=uKXEe2ATw0nehM%3A
^^^^^ Hope this helps. Best, Gerry
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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12-28-2016, 08:17 AM
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Join Date: May 2004
Location: Boulder, Colorado
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You want the VR to be on the top, which it is here in the first picture. Allows you to replace the VR when it wears out without having to pull the wires off of the alternator to fully remove the alternator from the engine. Then be sure to put the cone with the air deflectors back on so they deflect air as they should, especially to the #1 cylinder.
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12-29-2016, 08:15 PM
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