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Join Date: Mar 2014
Posts: 121
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1999 996 alternator mount broke
what am I looking at to replace it? The lower mounting ear snapped off and my alternator is just hanging out loose.
It looks like the mounting ear just unbolts, but I'm waiting til it cools to take it apart and snap a few pics to post. Thanks for any advice guys 
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99 911 Carrera 2, factory LSD, GT3 aero 85.1 944, white with tan scripts *sold* 88 944 azurite blue at to mt swap and restoration/upgrade |
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05-24-2018, 08:02 AM
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Join Date: Jan 2004
Location: Pittsford, NY
Posts: 3,721
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did it break at the alternator or the engine? You might need a welder.
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Tony G 10 Porsches come & gone! 1962 Morgan Plus 4 
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05-24-2018, 02:21 PM
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Join Date: Jan 2008
Location: NJ
Posts: 1,186
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The alternator mounts to an ear on a cover plate. Is that the one that broke? The 997 piece is stronger and can replace the earlier one.
https://rennlist.com/forums/996-forum/944668-help-engine-cover-alternator-bracket.html
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2013 991.1 Carrera S Cab 2004 996 Turbo CAB X50 sold 2003 996 cab 6 speed Sold 1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold DE instructor since 1985 Last edited by FPB111; 05-24-2018 at 05:33 PM.. |
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05-24-2018, 05:31 PM
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it has been raining all day and I haven't gotten to take it apart. the ear is definitely broken off the engine, not the alternator.
i'll check out that link. from what I can see it is able to be unbolted from the engine, so I guess I'll order the 997 version. is this a common thing? thanks for the help FPB111
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99 911 Carrera 2, factory LSD, GT3 aero 85.1 944, white with tan scripts *sold* 88 944 azurite blue at to mt swap and restoration/upgrade |
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05-24-2018, 05:59 PM
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that link on RL cleared it up thanks. Now to get the 997 part and do the work
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99 911 Carrera 2, factory LSD, GT3 aero 85.1 944, white with tan scripts *sold* 88 944 azurite blue at to mt swap and restoration/upgrade |
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05-24-2018, 06:19 PM
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So I discovered a few other things damaged. The rear right mounting ear on the alternator case (threaded for the long bolt) is cracked also. I just tested my alternator a few weeks ago and it was good, so I'd rather not buy a new one.
Does anyone have a bad old 996 alternator laying around that I can buy for parts?
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99 911 Carrera 2, factory LSD, GT3 aero 85.1 944, white with tan scripts *sold* 88 944 azurite blue at to mt swap and restoration/upgrade |
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05-25-2018, 12:32 PM
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Join Date: Mar 2014
Posts: 121
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update just to provide closure.. I got an alternator, so that is no longer needed. Thanks for the offers.
Installed everything and that low rpm rattle I heard is totally gone...apparently it must have been the alternator bracket and case shaking around before it finally snapped.
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99 911 Carrera 2, factory LSD, GT3 aero 85.1 944, white with tan scripts *sold* 88 944 azurite blue at to mt swap and restoration/upgrade |
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06-09-2018, 12:02 AM
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