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Join Date: Aug 2007
Location: San Diego, CA
Posts: 148
shaft length on alternator

I am in the processing of assembling parts onto my long block. I am having some trouble with alternator/fan compatibility. The shaft on the alternator seems to be a bit short. The UNthreaded portion of the shaft measures 15mm. On the fan side, the hole measures 20mm. So when I put the fan onto the alternator, it seems that I should have more threaded area on the shaft. I have read that the alternators vary in height depending on year, but how about the shaft? Could have an incorrect alternator?

PS housing is 901 106 101 5r


Last edited by ttw18; 12-20-2007 at 06:45 PM..
Old 12-20-2007, 06:43 PM
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Join Date: Mar 2001
Location: Marysville Wa.
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slip the fan on, tighten the nut and see if it gets longer.
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Old 12-20-2007, 06:56 PM
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90 amp, internal regulator, Valeo, '77 fan shroud.




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Old 12-20-2007, 07:43 PM
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