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Registered
Join Date: Apr 2025
Location: Denmark
Posts: 12
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Alternator / generator bolts to short
Hi, I faced a issues today when installing my new alternator / generator. It seems like the studs/bolts are too short? I dont have the old generator around anymore, I would like to have compared the bolt lenght.
My engine is a 1976 2,7 with 5 blade fan. Is there any difference in generator model's? I ordered a new generator with external regulator. Thanks   
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07-13-2025, 11:37 AM
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Lash
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I swapped my alternator on my 1980 SC recently and had a similar problem. Discovered that there was a couple burrs inside the fan housing not allowing the alternator to completely sit in the fan housing properly.
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Lash 1963 356 T-6 Normal Coupe 1972 911 T Coupe ..... Sold 1972 911 S Targa ...... Sold 1980 911 SC Coupe Weissach |
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07-13-2025, 04:06 PM
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Registered
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There are 2 sizes of alternators as the depth of the housing is different. I ended up having my original rebuilt as I did not take it to get the core charges. If you di a search there are photos of the diffrrent depths and which alternators fit. Longer bolts dont help as the alternator is too far into the housing and the fan will not spin
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07-13-2025, 06:33 PM
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07-13-2025, 06:39 PM
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Get off my lawn!
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It looks like you powder coated the fan. That extra thickness is likely part of the issue.
If you remember, taking the alternator out of the fan requires a couple of 2x4s and a drop of a foot or more to get the alternator out. It is a very snug fit. I would suggest you sand off the paint coating on the inside of the fan and try again. And double check the fan does not rub on the inside of the fan housing. Again very tight tolerances.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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07-14-2025, 05:45 AM
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Registered
Join Date: Jul 2013
Location: South East England
Posts: 1,692
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Quote:
Early up to last F-body, Mid: up to and incl. SC, Late: Carrera 3.2
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07-15-2025, 02:09 PM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,164
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It’s been a long time, but I remember when I got my replacement alternator, I had to reuse my old bolts to make it work. Would Belmetric or McMaster have what you need?
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07-15-2025, 04:46 PM
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Titanium User
Join Date: Aug 2014
Location: NY
Posts: 3,251
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The fan and housing may touch with the thick looking powder coat.
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Buy some Titanium Lug Nuts! http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/1032311-fs-titanium-lug-nuts-studs-v2-0-a.html ig: @ti_porsche_products |
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07-16-2025, 04:22 AM
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Registered
Join Date: Jul 2013
Location: South East England
Posts: 1,692
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Quote:
https://youtu.be/P9dy5wSbeHk?si=0wnzQmBfaEzzGFoS
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07-16-2025, 11:26 AM
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Registered
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 14,164
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I just looked at your first picture again. As mentioned, you need to clean the alternator and remove the powder coating from the inside of the housing, to get the alternators to seat completely. Once you’ve done that, then you can evaluate bolts.
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07-16-2025, 03:25 PM
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Carrera
