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Registered
Join Date: Oct 2012
Posts: 131
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1979 fan pulley nut quest
1979 sc -Outer half of fan pulley came apart and ruined nut. Have new pulley and shims - can't locate correct threaded nut. Have tried a 16 x 1mm from Fastenal too fine 16-1.5 better but doesn't fit. What else can it be?Threads on shaft are in good shape. What's left of original nut goes on and off fine except it is now round. Engine number is 6290829 I was told it was a 3.0 but previous owner has passed away .
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02-17-2014, 04:31 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,505
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There will be others piping in because there was an article on PP about recutting threads to a 5/8 die. Dont hold me to the size becuse its trivia information from reading a post.
I have seen the fine thread recut though. Bruce |
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02-17-2014, 04:36 PM
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non-whiner
Join Date: Aug 2012
Location: Slightly right of center
Posts: 5,235
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What's the matter with this one from our host?
901-603-905-01-OEM
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"Too much is just enough." |
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02-17-2014, 05:23 PM
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Join Date: Oct 2012
Posts: 131
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The host describes nut as 16 mmx1.i already Bought five 16mmx1 nuts and tread is different. Is this the ONLY size that has been found on these?
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02-17-2014, 05:35 PM
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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,717
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the stock alternator shaft/nut thread used until 1981 is 16 x 1, however, that changed to a 17 x 1.5 in 1982. your engine number indicates a 79 SC engine, but is it possible that you have a later alternator in your 79 SC?
regards, Al
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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02-17-2014, 06:03 PM
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Join Date: May 2006
Location: Rocklin, CA
Posts: 803
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I went through this ordeal about four or five years ago. I ended up finding the correct nut at a local business that rebuilds alternators. I think I started a thread about it here on PP.
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02-17-2014, 06:11 PM
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Join Date: May 2006
Location: Rocklin, CA
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02-17-2014, 06:15 PM
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Join Date: Oct 2012
Posts: 131
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Thanks I have read through that link. 16x1 is too fine - I might try and I.D. the tread pitch of what I have left. It must have been re tapped.
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02-17-2014, 06:31 PM
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I had the same problem. Ended up finding one here on Pelican used parts thread. Then the guy rebuilding my Alternator at Lehr Auto Electric in Sacramento gave me one he had stashed.
1973 911 T MFI Coupe, Aubergine Steve |
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02-17-2014, 07:08 PM
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Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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If you have a thread gauge, ought not to be too hard to check the thread pitch on the alternator. And measure the OD of the threads and the ID of your nut to see what matches best.
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02-17-2014, 08:39 PM
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Join Date: Oct 2012
Posts: 131
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I went to two machine shops today. The nut that fits my shaft is metric 1.5 tread pitch. We did confirm that the nut is not 5/8 anything.I measured the diameter of my shaft at 16.84mm. Spent a hour digging at our oldest and only alternator shop for right fit- using my "round" nut on existing alternators . Close but none fit. Fastenal doesn't list a 17x 1.5 nut. The employee called some suppliers and struck out. At this point I'm wide open for sane suggestions. Trying to get every thing done for a road trip to Amelia island. I want to touch a million dollar 73!
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02-18-2014, 05:37 PM
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Join Date: May 2011
Posts: 7,245
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According to the Porsche PET Catalog the '79 alternator nut is supposed to have a M16X1 thread, P/N: "901 603 905 00". That nut was changed in '82 to a M17X1.5 nut, P/N "928 603 904 00" .
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79 SC Targa 72 T Targa Sold 68 T Coupe Sold 65 912 Coupe Sold 62 356B Coupe Sold |
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02-18-2014, 05:52 PM
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Registered
Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,717
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Porsche 911 & Carrera Engine Miscellaneous - Page 6
928-603-904-00-M262 available from Pelican regards, al
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[B]Current projects: 69-911.5, Previous:73 911X (off to SanFrancisco/racing in Germany).77 911S (NY), 71E (France/Corsica), 66-912 ( France), 1970 914X (Wisconsin) 76 911S roller..off to Florida/Germany RGruppe #669 http://www.x-faktory.com/ |
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02-18-2014, 06:28 PM
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