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Trouble Tightening Fan Belt with Rebuilt Alternator
I have a 1975 911S with a '76 2.7L engine. I was having alternator issues, so I pulled the unit and had it rebuilt by a reputable shop. I had no issues removing the alternator (Valero brand) and the fan spun freely inside the housing.
I re-installed the alternator, fan, etc. with no issues. The fan spun freely inside the housing again. I re-installed the old fan belt (10x725), as it had no wear issues, and tightened it to 29.5 lbs. as directed by the manual. This caused the fan to move towards the alternator and pin it so that it does not spin freely. I think the interior of the fan hub is jammed against the sides of the alternator causing the impingement. So I pulled everything apart again and used a rubber mallet to move the fan to its rightful place. Re-installed a second time and before I could even get the fan nut to the proper torque, it pinned the fan again. When I originally took the fan belt off, I found that there were only 5 washers instead of the required 6. When I re-installed, I used all 6 washers as directed by the manual. Has anyone else had this problem? Is there a spacer that I need between the front of the alternator and the rear of the fan? There is no spacer shown in any manual I own. Any help would be appreciated. |
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07-29-2023, 03:30 PM
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The washers are for adjusting the belt tightness. They are distributed either between the pulley halves or on the outside under the nut. All 6 washers between the pulllies is max looseness, all outside is max tightness. Where did you put the washers?
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07-29-2023, 03:41 PM
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Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,702
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If I remember correctly, there is a thick washer/spacer installed at the base of the alternator shaft.
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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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07-29-2023, 04:04 PM
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Join Date: Jul 2001
Location: mt. vernon Wa. USA
Posts: 8,702
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spacer?
The shims will affect belt tightness, but typically do not affect the fan rotation....unless the alternator is not fully seated and tight into the base of the fan housing...then a too tight belt can cock the fan into the housing and impede its rotation.
If I remember correctly, there is a thick washer/spacer installed at the base of the alternator shaft. 
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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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07-29-2023, 04:18 PM
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Thank you much for the info on the spacer. I’m thinking it may have been removed during the rebuilding. Anyone know where I can acquire a new one
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07-29-2023, 06:28 PM
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| Tags |
| alternator , fan , fan belt |
