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  #1  
Old 08-05-2015, 09:03 PM
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No Alternator Woodruff Key?? '75 240D

Hey guys...

Went to replace my dead alternator today.. removed the pulley and fan from the original and there was no woodruff key in place.

There is a groove in the shaft for the key and notches in the pulley, spacers, and fan as well.. but no key. I've read that on some years, the key was not used and on some years it was...

No local pull-a-part yards... and I doubt the local hardware store has a metric woodruff key selection...

Is this key needed on this year?

I'm upgrading to the 115amp Saab alternator.

-Chris
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  #2  
Old 08-05-2015, 09:55 PM
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I usually don't get to this side of the forum, saw the title and decided to stop by.

Modern alternators no longer have a key. Did you check the SAAB unit? It probably does not have the shaft cut for one. If it does have a place for a key use the one that came with it. If the SAAB is missing the key and you really want one, you can file a piece of steel down to fit as the tolerances are not that critical..
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Old 08-05-2015, 11:16 PM
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The Saab alternator does have a place for the key and it didn't come with one..

I'm just trying to sort out if mine being missing is factory as some say it is and some say it isn't.

Most newer alternators use a tapered shaft which eliminates the need for a key...

I'll probably run it down and just mark the pulley/shaft to see if it holds while under load.

Thanks
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Old 08-06-2015, 07:20 AM
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I don't know of any alternator that uses a tapered shaft, some Chryslers from the 60'6 to 80's used a pressed on pulley.

The original alt on your car may have been rebuilt at some point and the key not reinstalled.

For the SAAB alt, just file something out of a piece of steel, the key isn't hardened.
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  #5  
Old 08-06-2015, 01:16 PM
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. . . or take the alternator to the local old-time hardware store and look for a Woodruff key that's close and grind it down to fit--the alternator probably consumes three or four shaft horsepower when working hard



Tim Kraakevik
kraakevik@voyager.net
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  #6  
Old 08-06-2015, 03:52 PM
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^ precisely what I did.. Found one that was close.. So be filing it down and fitting it after work.

Thanks
-Chris
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